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Important Review skippedAuto reviews are disabled on base/target branches other than the default branch. Please check the settings in the CodeRabbit UI or the You can disable this status message by setting the WalkthroughThe changes introduce various enhancements across multiple files in a JavaScript project. Key modifications include updates to the Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Server
participant WebSocketClient
participant WebSocketServer
User->>WebSocketClient: Connect
WebSocketClient->>WebSocketServer: Establish connection
WebSocketServer-->>WebSocketClient: Connection confirmed
User->>WebSocketClient: Send message
WebSocketClient->>WebSocketServer: Forward message
WebSocketServer-->>User: Send response
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Actionable comments posted: 18
Outside diff range and nitpick comments (20)
js-advanced/test.js (2)
1-5: Rename the function and removeconsole.logstatements.The function correctly demonstrates the usage of rest parameters and the
argumentsobject. However, please consider the following suggestions:
- Rename the function to a more descriptive name, such as
logArguments, to improve code readability.- Remove the
console.logstatements as they are not suitable for production code. Instead, consider using a logging library or returning the values for testing purposes.
7-7: Add a comment to explain the purpose of the function invocation.The function invocation at line 7 is used to test the
afunction. However, it's not immediately clear what the expected output is.Consider adding a comment to explain the purpose of the function invocation and the expected output. For example:
// Invoke the `a` function with arguments 1, 2, and 3 to test the rest parameters and `arguments` object. // Expected output: // [1, 2, 3] // [Arguments] { '0': 1, '1': 2, '2': 3 } 1 // [1, 2, 3] a(1, 2, 3);js-advanced/post/package.json (4)
1-4: Consider improving the project metadata.A few suggestions:
The project name "file" is too generic. Consider using a more descriptive name that reflects the project's purpose or functionality.
The main entry point is set to "client.js", which is not a common convention. Consider using "index.js" or the name of the main module of your application.
5-9: Update the scripts section as the project evolves.A few suggestions:
The test script is currently a placeholder. Remember to update it to run actual tests once they are implemented.
The "client-post" script seems to be a custom script for this project. Consider giving it a more descriptive name that reflects its purpose. For example, if it's posting client data, you could name it "post-client-data" or something similar.
10-11: Add keywords and author information.Consider adding relevant keywords to the "keywords" array to improve the discoverability of your project. For example, you could include keywords related to the project's functionality, the libraries or frameworks used, or the problem domain it addresses.
Also, consider adding author information to the "author" field to help identify who maintains this project.
12-13: Add a project description.Consider adding a brief description to the "description" field to provide a quick overview of your project's purpose or functionality. This can help others understand what your project does at a glance.
js-advanced/catch/catch.js (2)
1-8: Great example of error handling usingtry...catch!The function correctly demonstrates the usage of
try...catchfor error handling. The error is intentionally thrown within thetryblock and caught within thecatchblock.Consider removing the commented-out line to avoid confusion:
- // throw new Error('inner throw I am an error');
24-28: Remove the commented-out lines.The commented-out lines at the end of the file are inconsistent with the actual output sequence. The actual output sequence is:
1- Error handling output from the
catchblock inmain4Please remove these lines to avoid confusion:
-// 1 -// catchME -// 2 -// 4js-advanced/requirement/combinatorial-inheritance.js (1)
4-9: Consider moving the inner method to the prototype for better memory efficiency.The inner method is defined within the constructor, which means it will be recreated for each instance of
Animal. This can be inefficient in terms of memory usage.Consider moving the inner method to the prototype:
function Animal(name = 'animal') { this.name = name - this.inner = function () { - console.log('inner') - } } +Animal.prototype.inner = function () { + console.log('inner') +}js-advanced/nodejs-design-pattern/throw-error.js (1)
4-20: Improve documentation and type checking.The
readJSONfunction correctly handles errors during file reading and JSON parsing by invoking the callback with the error. It follows the Node.js convention of passing errors as the first argument to the callback and uses a try-catch block to handle JSON parsing errors.However, the function could be improved by:
- Adding JSDoc comments to document the function parameters and return value.
- Adding type checks for the function parameters.
Apply this diff to improve the function:
+/** + * Reads a JSON file asynchronously. + * @param {string} filename - The name of the file to read. + * @param {function} callback - The callback function to invoke with the parsed JSON data or error. + * @returns {void} + */ function readJSON(filename, callback) { + if (typeof filename !== 'string') { + throw new TypeError('filename must be a string'); + } + if (typeof callback !== 'function') { + throw new TypeError('callback must be a function'); + } + fs.readFile(filename, 'utf-8', (err, data) => { let parsed; if(err) { return callback(err); } try { parsed = JSON.parse(data); }catch(err) { return callback(err); } callback(null, parsed); }) }js-advanced/post/client/client-post.js (1)
7-19: Remove commented-out code.The commented-out code that reads the entire file into memory using
fs.readFileSyncis not used and can be safely removed to improve code readability.Apply this diff to remove the commented-out code:
-/* const data = { - file: fs.readFileSync(file) -} - */ - const data = { file: fs.createReadStream(file), }; - -/* const data = { - file: fs.readFileSync(file), -} - */js-advanced/post/client/form-data.html (1)
6-6: Improve the page title.The current page title "Document" is generic and doesn't describe the page content. Update it to be more specific and informative.
Apply this diff to update the title:
-<title>Document</title> +<title>File Upload Form</title>js-advanced/implement/new.js (3)
1-6: LGTM! Consider makinghabitconfigurable.The constructor function is correctly implemented. However, consider allowing
habitto be passed as an argument with a default value to make it configurable.-function Otaku (name, age) { +function Otaku (name, age, habit = 'Games') { this.name = name; this.age = age; - this.habit = 'Games'; + this.habit = habit; }
9-14: LGTM! Translate the comment to English.The prototype property and method are correctly implemented. However, please translate the comment about the
strengthproperty to English for consistency and accessibility.-// 因为缺乏锻炼的缘故，身体强度让人担忧 +// Due to lack of exercise, the physical strength is concerning Otaku.prototype.strength = 60; Otaku.prototype.sayYourName = function () { console.log('I am ' + this.name); }
40-40: LGTM! Consider adding assertions.The code demonstrates the usage of the
myNewfunction correctly. However, consider adding assertions to verify that the instance is created with the expected properties and prototype.var p2 = myNew(Otaku,'Kevin', '18'); +console.assert(p2.name === 'Kevin'); +console.assert(p2.age === '18'); +console.assert(p2.habit === 'Games'); +console.assert(p2.strength === 60); +console.assert(p2.sayYourName instanceof Function);js-advanced/implement/call-apply-bind/apply.js (1)
22-36: Excellent implementation of theapply2method!The implementation correctly sets the
thiscontext, invokes the function with the provided arguments, and returns the result. The use of a temporary property on the context object is a clever way to invoke the function with the desiredthiscontext.Consider using
undefinedassignment instead of thedeleteoperator to avoid potential performance impact:- delete _context.fn; + _context.fn = undefined;Tools
Biome
[error] 32-35: Avoid the delete operator which can impact performance.
Unsafe fix: Use an undefined assignment instead.
(lint/performance/noDelete)
js-advanced/post/server.js (2)
5-5: Consider removing the rocket emoji from the log message.The log message is using a rocket emoji, which may not be appropriate for production code. Consider removing the emoji to keep the log message professional and consistent with the rest of the codebase.
Apply this diff to remove the rocket emoji:
-console.log("🚀 ~ .createServer ~ Content-Type:", req.headers["content-type"]) +console.log("Content-Type:", req.headers["content-type"])
6-9: Consider translating the comments to English.The comments are in Chinese, which may not be appropriate for a codebase that is primarily in English. Consider translating the comments to English to keep the codebase consistent and accessible to all developers.
Apply this diff to translate the comments to English:
-// 支持跨域 +// Support cross-origin requests res.setHeader("Access-Control-Allow-Origin", "*"); res.setHeader("Access-Control-Allow-Methods", "POST, GET"); res.setHeader("Access-Control-Allow-Headers", "Content-Type");js-advanced/design-pattern/02-easy-factory.ts (1)
25-30: Consider using a switch statement for better readability and maintainability.The
addmethod could be improved by using a switch statement instead of an if-else statement for better readability and maintainability.Apply this diff to refactor the
addmethod:- add(type: TName, quantity: number) { - const block = type === "Circle" ? Circle : Square; - for (let i = 0; i < quantity; i++) { - this.blocks.push(new block()); - } - } + add(type: TName, quantity: number) { + let block: typeof Circle | typeof Square; + switch (type) { + case "Circle": + block = Circle; + break; + case "Square": + block = Square; + break; + } + for (let i = 0; i < quantity; i++) { + this.blocks.push(new block()); + } + }js-advanced/base/ws/index.html (1)
14-31: The WebSocket connection and event handlers are correctly implemented.The code segment correctly establishes a WebSocket connection and includes event handlers for various events. The event handlers are properly logging the relevant information.
However, the
oncloseevent handler is unnecessarily callingws.close()after the connection is already closed. Please remove this line:-ws.close();
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files ignored due to path filters (3)
js-advanced/base/ws/pnpm-lock.yamlis excluded by!**/pnpm-lock.yamljs-advanced/post/assets/ico.svgis excluded by!**/*.svgjs-advanced/post/pnpm-lock.yamlis excluded by!**/pnpm-lock.yaml
Files selected for processing (36)
- .gitignore (1 hunks)
- README.md (1 hunks)
- js-advanced/README.md (1 hunks)
- js-advanced/base/asnyc.mjs (1 hunks)
- js-advanced/base/ws/index.html (1 hunks)
- js-advanced/base/ws/package.json (1 hunks)
- js-advanced/base/ws/server.mjs (1 hunks)
- js-advanced/catch/catch.js (1 hunks)
- js-advanced/catch/promise-catch.js (1 hunks)
- js-advanced/design-pattern/01-singleton-hunger.ts (1 hunks)
- js-advanced/design-pattern/01-singleton-lazy.ts (1 hunks)
- js-advanced/design-pattern/02-easy-factory.ts (1 hunks)
- js-advanced/design-pattern/02-factory.ts (1 hunks)
- js-advanced/design-pattern/03.abstract-factory.ts (1 hunks)
- js-advanced/design-pattern/README.md (1 hunks)
- js-advanced/implement/call-apply-bind/apply.js (1 hunks)
- js-advanced/implement/call-apply-bind/bind.js (1 hunks)
- js-advanced/implement/call-apply-bind/call.js (1 hunks)
- js-advanced/implement/call-apply-bind/demo.js (1 hunks)
- js-advanced/implement/new.js (1 hunks)
- js-advanced/nodejs-design-pattern/README.md (1 hunks)
- js-advanced/nodejs-design-pattern/asynchron-api.js (1 hunks)
- js-advanced/nodejs-design-pattern/throw-error.js (1 hunks)
- js-advanced/post/assets/a.txt (1 hunks)
- js-advanced/post/client/axios.html (1 hunks)
- js-advanced/post/client/client-post.js (1 hunks)
- js-advanced/post/client/form-data.html (1 hunks)
- js-advanced/post/client/index.html (1 hunks)
- js-advanced/post/client/x-www-form-urlencoded.html (1 hunks)
- js-advanced/post/client/xhr.html (1 hunks)
- js-advanced/post/package.json (1 hunks)
- js-advanced/post/server.js (1 hunks)
- js-advanced/requirement/combinatorial-inheritance.js (1 hunks)
- js-advanced/requirement/prototype-chain-inheritance.js (1 hunks)
- js-advanced/requirement/strong-typeof.js (1 hunks)
- js-advanced/test.js (1 hunks)
Files skipped from review due to trivial changes (4)
- .gitignore
- js-advanced/README.md
- js-advanced/base/ws/package.json
- js-advanced/post/assets/a.txt
Additional context used
LanguageTool
js-advanced/nodejs-design-pattern/README.md
[uncategorized] ~1-~1: 数词与名词之间一般应存在量词，可能缺少量词。
Context: ## Node.js 设计模式 第二版 案例 #### [函数处理回调 是同步还是异步，要统一](./asynchr...(wa5)
js-advanced/design-pattern/README.md
[uncategorized] ~3-~3: A punctuation mark might be missing here.
Context: # 设计模式案例实现 ## 参考文档 01.单例模式（饿汉） [...(AI_EN_LECTOR_MISSING_PUNCTUATION)
Markdownlint
js-advanced/nodejs-design-pattern/README.md
3-3: Expected: h3; Actual: h4
Heading levels should only increment by one level at a time(MD001, heading-increment)
5-5: null
No empty links(MD042, no-empty-links)
Biome
js-advanced/implement/call-apply-bind/apply.js
[error] 32-35: Avoid the delete operator which can impact performance.
Unsafe fix: Use an undefined assignment instead.
(lint/performance/noDelete)
js-advanced/implement/call-apply-bind/call.js
[error] 32-34: Avoid the delete operator which can impact performance.
Unsafe fix: Use an undefined assignment instead.
(lint/performance/noDelete)
Additional comments not posted (67)
js-advanced/nodejs-design-pattern/README.md (1)
1-2: LGTM!The heading is correctly formatted and the level is appropriate for the context.
The static analysis hint about missing a measure word between the number and the noun is a false positive and can be safely ignored in this context.
Tools
LanguageTool
[uncategorized] ~1-~1: 数词与名词之间一般应存在量词，可能缺少量词。
Context: ## Node.js 设计模式 第二版 案例 #### [函数处理回调 是同步还是异步，要统一](./asynchr...(wa5)
js-advanced/design-pattern/README.md (1)
1-5: LGTM!The README.md file provides a clear overview of the design pattern implementations in the project. The reference link and the specific implementations mentioned are helpful for developers to understand and utilize these patterns.
The Chinese text is correctly written and does not require any punctuation changes, despite the suggestion from the static analysis tool.
Tools
LanguageTool
[uncategorized] ~3-~3: A punctuation mark might be missing here.
Context: # 设计模式案例实现 ## 参考文档 01.单例模式（饿汉） [...(AI_EN_LECTOR_MISSING_PUNCTUATION)
js-advanced/base/asnyc.mjs (2)
6-8: LGTM!The async function is correctly implemented.
10-12: LGTM!The async function is correctly implemented.
README.md (1)
27-29: LGTM!The addition of the "shell" entry to the checklist is a valuable enhancement to the documentation. It follows the existing format and provides clearer guidance to users about the topics covered in the project.
js-advanced/post/package.json (1)
14-16: Good choice of HTTP library.Axios is a widely used and well-supported library for making HTTP requests in JavaScript. It's a good choice if your project needs to interact with a web API.
js-advanced/catch/catch.js (1)
10-20: Excellent demonstration oftry...catch...finallybehavior!The function correctly illustrates the principles of error handling and control flow in JavaScript, providing a clear example of how exceptions can be managed within nested function calls.
js-advanced/implement/call-apply-bind/demo.js (6)
1-3: LGTM!The object
foois correctly defined with avalueproperty set to1. It serves as a context object for the subsequent function calls.
5-7: LGTM!The function
bar1is correctly defined and demonstrates the usage of thethiskeyword to access thevalueproperty of the context object.
9-9: LGTM!The
bar1function is correctly invoked using thecallmethod withfooas the context object. This demonstrates the usage of thecallmethod to set the context for the function call.
11-15: LGTM!The function
bar2is correctly defined and demonstrates the usage of thethiskeyword to access thevalueproperty of the context object along with the function parameters (nameandage).
17-19: LGTM!The
bar2function is correctly invoked using bothcallandapplymethods withfooas the context and the required parameters. The creation ofbarBindusing thebindmethod withfooas the context is also correctly implemented. This demonstrates the usage ofcall,apply, andbindmethods to set the context and parameters for the function calls.
21-26: LGTM!The code segment correctly demonstrates how
thisbehaves when the function is called withnullas the context, resulting in accessing the global variablevalueinstead. The invocations ofbar1withnullas the context andbarBindwith its own parameters illustrate the different contexts and parameter handling in action.js-advanced/requirement/combinatorial-inheritance.js (3)
11-13: LGTM!The
eatmethod is correctly defined on the prototype, which allows all instances ofAnimalto share the same method, improving memory efficiency.
15-17: LGTM!The
Dogconstructor function is correctly defined, and calling theAnimalconstructor within theDogconstructor ensures thatDoginstances have access to the properties defined inAnimal.
21-23: LGTM!The
barkmethod is correctly defined on the prototype, which allows all instances ofDogto share the same method, improving memory efficiency.js-advanced/requirement/prototype-chain-inheritance.js (5)
3-7: LGTM!The
Animalconstructor function is correctly defined with aninnermethod.
9-11: LGTM!The
eatmethod is correctly added to theAnimal.prototype.
14-18: LGTM!The
Dogconstructor function is correctly defined with adrinkmethod.
22-24: LGTM!The
barkmethod is correctly added to theDog.prototype.
26-30: LGTM!The
doginstance is correctly created, and the method calls demonstrate the functionality of prototype chain inheritance.js-advanced/post/client/client-post.js (3)
1-3: LGTM!The imports are correctly used and necessary for the file upload functionality.
5-5: LGTM!Using
path.joinis a good practice to ensure compatibility across different operating systems.
12-33: LGTM!The code segment correctly implements the file upload functionality using Axios and handles the asynchronous nature of the process. Using
fs.createReadStreamis more efficient for large files compared to reading the entire file into memory. The code provides feedback based on the success or failure of the operation.js-advanced/post/client/form-data.html (1)
13-13: Verify the form action URL.Ensure that a server is set up and running at
http://localhost:13000to handle the/uploadFilePOST request. Test the endpoint to confirm it can handle file uploads as expected.Run the following script to verify the server setup:
js-advanced/implement/call-apply-bind/apply.js (1)
38-41: Great demonstration of theapply2method!The demonstration code effectively showcases the functionality of the
apply2method by invoking thebarfunction with different contexts and arguments. It demonstrates how thethiscontext is set based on the provided context argument, and how the function arguments are passed using an array.js-advanced/design-pattern/02-factory.ts (2)
8-12: LGTM!The
Circleclass correctly implements theBlockinterface by providing the requiredproductmethod.
14-18: LGTM!The
Squareclass correctly implements theBlockinterface by providing the requiredproductmethod.js-advanced/implement/call-apply-bind/call.js (1)
37-40: The demonstration code looks good!The demonstration code correctly showcases the functionality of the
call2method by invoking thebarfunction with different contexts and arguments.js-advanced/implement/call-apply-bind/bind.js (5)
1-9: LGTM!The code segment correctly sets up the object
fooand the functionbarfor demonstrating the custombind2function.
11-20: Skipping the review of the commented-out code segment.The commented-out code serves as a reference for the expected behavior of the
bind2function and does not require a review.
22-29: Great implementation of the custombind2function!The
bind2function correctly captures thecontextand additional arguments, and returns a new function that applies the original function to thecontextwith the combined arguments. The implementation follows the expected behavior of the nativebindfunction.
31-31: Setting the global variablevalueis appropriate.The global variable
valueis set to demonstrate the difference in context whennullis passed as the binding context to thebind2function. This is a valid use case for testing the behavior of thebind2function.
33-38: The demonstration code effectively showcases the behavior of thebind2function.The code segment correctly demonstrates the usage of the
bind2function in different scenarios:
- Binding
bartofoosets thethiscontext tofoowhenbar1is invoked.- Binding
bartonullsets thethiscontext to the global object whenbar2is invoked.- Binding
bartofoowith pre-defined arguments demonstrates how thebind2function handles both the context and arguments.The demonstration code provides a clear understanding of how the
bind2function works in practice.js-advanced/post/server.js (3)
1-2: LGTM!The code segment correctly imports the
httpmodule, which is a core Node.js module for creating HTTP servers and making HTTP requests.
3-25: LGTM!The code segment correctly creates an HTTP server that handles both POST and GET requests. The server correctly sets CORS headers to allow cross-origin requests, collects incoming data chunks for POST requests, logs the body content to the console, and responds with appropriate messages for both POST and GET requests.
26-28: LGTM!The code segment correctly starts the HTTP server and listens on port 13000. The server also logs a message to the console when it starts listening, which is helpful for debugging and monitoring purposes.
js-advanced/post/client/index.html (3)
1-30: LGTM!The HTML structure is well-formed and follows best practices. The metadata in the
<head>section is appropriate, and the<body>section is organized with meaningful elements.
11-20: LGTM!The form is correctly configured for handling file uploads. The
action,method, andenctypeattributes are set appropriately. The form includes the necessary input fields for capturing the username and the file.
22-28: LGTM!The JavaScript code provides a useful functionality by updating the page to display the name of the selected file, giving immediate feedback to the user. The code is correctly implemented and follows best practices by using
getElementByIdto target specific elements and updating the content using theinnerHTMLproperty.js-advanced/design-pattern/02-easy-factory.ts (3)
7-9: LGTM!The
Blockinterface is correctly defined and serves as a contract for the concrete block classes.
11-21: LGTM!The
CircleandSquareclasses correctly implement theBlockinterface and provide the expected behavior.
23-37: LGTM!The
Factoryclass correctly implements the simple factory pattern, allowing the creation of different types of blocks based on the provided type. Theaddandoutputmethods work as expected.js-advanced/design-pattern/01-singleton-hunger.ts (6)
5-8: LGTM!The
IProductinterface is well-defined and accurately represents the structure of a product object with a name and quantity.
10-13: LGTM!The
IShoppingCartManagerinterface is well-defined and accurately outlines the methods required for a shopping cart manager.
15-34: LGTM!The
ShoppingCartManagerclass correctly implements the singleton pattern and adheres to theIShoppingCartManagerinterface. The private constructor and static instance ensure that only one instance of the shopping cart exists throughout the shopping process. TheaddandviewCartmethods are correctly implemented and adhere to the interface contract.
21-23: LGTM!The
getInstancemethod is correctly implemented and ensures that only one instance of the shopping cart exists throughout the shopping process.
25-27: LGTM!The
addmethod is correctly implemented and adheres to the interface contract.
29-33: LGTM!The
viewCartmethod is correctly implemented and adheres to the interface contract.js-advanced/base/ws/index.html (2)
1-10: LGTM!The HTML structure is correctly implemented, and the button is properly defined with an id and label.
33-33: LGTM!The click event listener is correctly added to the button, and it triggers the
sendfunction when the button is clicked.js-advanced/base/ws/server.mjs (1)
1-34: LGTM!The WebSocket server setup is well-structured and follows best practices. The configuration options for message compression are well-documented and follow recommended settings for efficient data transmission while managing memory and performance. The server logs appropriate messages and demonstrates a basic interaction pattern with clients. There are no apparent issues or areas for improvement.
js-advanced/design-pattern/01-singleton-lazy.ts (6)
1-4: Clear problem statement and requirements.The comments provide a clear problem statement and requirements for the shopping cart manager. The mention of a single instance of the shopping cart throughout the shopping process suggests the appropriate use of the singleton pattern.
5-13: Well-defined interfaces.The
IProductandIShoppingCartManagerinterfaces provide a clear structure for the product and shopping cart manager entities. The properties and methods are appropriately defined to represent the necessary data and functionality.
15-37: Correct implementation of the singleton pattern and shopping cart functionality.The
ShoppingCartManagerclass correctly implements the singleton pattern by using a private constructor and a staticgetInstancemethod. The class properly implements the methods defined in theIShoppingCartManagerinterface, allowing products to be added to the cart and the cart contents to be viewed. The use of a privateproductsarray ensures proper encapsulation of the cart data.
39-45: Correct usage example of theShoppingCartManagerclass.The code segment correctly demonstrates the usage of the
ShoppingCartManagerclass by retrieving the singleton instance using thegetInstancemethod and using the instance to add products to the cart and view the cart contents. This ensures that only one instance of the shopping cart is used throughout the shopping process.
47-47: Appropriate use of empty export statement.The empty export statement
export {}is used to indicate that the file is an ES module, even though it doesn't export anything. This is a common practice in TypeScript files to ensure proper module behavior.
1-47: Overall, a well-implemented singleton pattern for shopping cart management.The file provides a solid implementation of the singleton pattern for a shopping cart management system. The code is well-structured, with clear interfaces and a properly implemented
ShoppingCartManagerclass. The usage example demonstrates the correct usage of the singleton instance. No major issues or areas for improvement were identified. Great job!js-advanced/catch/promise-catch.js (3)
1-7: LGTM!The
promiseErrorfunction is a useful utility to simulate a failing asynchronous operation. The implementation is correct and the intention is clear.
9-27: Great job with the promise chaining and error handling!The
adaptorfunction showcases effective use of promise chaining, error handling using.catch(), and cleanup actions using.finally(). Returning the error from the.catch()block to allow the promise chain to continue is a good practice.
29-40: Themainfunction properly consumes theadaptorfunction.The
mainfunction demonstrates how to consume a promise-returning function, handle its resolution and potential errors using.then()and.catch(), and perform cleanup actions using.finally(). The implementation is clear and follows best practices.js-advanced/requirement/strong-typeof.js (2)
24-26: Great implementation of themyTypeoffunction!The
myTypeoffunction correctly usesObject.prototype.toString.call()to accurately identify the type of the argument, even for types like arrays and null wheretypeoffalls short. Slicing the result and converting it to lowercase provides a clean and consistent output.Well done!
1-41: Excellent educational resource for type checking in JavaScript!This file provides a comprehensive and well-structured exploration of
typeofandObject.prototype.toStringfor type checking in JavaScript. The code examples effectively demonstrate the usage of these methods on various data types, highlighting the limitations oftypeofand the advantages of usingObject.prototype.toStringfor more accurate type identification.The custom
myTypeoffunction is a valuable addition that encapsulates the type checking logic usingObject.prototype.toString.call()and provides a clean interface for accurate type identification.The code quality is high, with clear comments, consistent formatting, and a logical flow that enhances the educational value of the file.
Great work on creating this informative and practical resource!
js-advanced/design-pattern/03.abstract-factory.ts (2)
7-59: Great job implementing the abstract factory design pattern!The design pattern implementation follows the abstract factory pattern correctly:
- The interfaces
IChairandISofadefine the contracts for the product classes.- The concrete classes
ModernSofa,ModernChair,ClassicalSofa, andClassicalChairimplement the respective interfaces.- The
IFactoryinterface defines the contract for the factory classes.- The factory classes
ModernFactoryandClassicalFactoryimplement theIFactoryinterface and provide methods for creating instances of the respective furniture types.The implementation is clean, well-structured, and adheres to the principles of the abstract factory pattern.
61-77: Themainfunction is well-implemented and demonstrates the usage of the abstract factory pattern.The
mainfunction is a higher-order function that returns a nested functiondfs. Thedfsfunction recursively generates combinations of furniture types based on the provided arguments. It correctly invokes the appropriate factory based on the type specified in the arguments and logs the product names to the console.The function showcases the dynamic creation of furniture items using the abstract factory pattern and provides a practical example of its usage.
js-advanced/post/client/axios.html (2)
1-18: LGTM!The HTML structure for the file upload functionality is correctly implemented, and the Axios library is correctly imported from a CDN.
42-55: LGTM!The Axios POST request to send the captured data to the server is correctly implemented, and the response from the server is correctly displayed in a designated callback area on the webpage.
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| #### [函数处理回调 是同步还是异步，要统一](./asynchron-api.js) | ||
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| #### [传播错误]() No newline at end of file |
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Fix the heading level, remove the empty link, and add a descriptive title.
The heading has the following issues:
- The heading level should be incremented by one level at a time. In this context, the heading should be a level 3 heading.
- The heading should not have an empty link.
- The case study title is missing.
Apply this diff to fix the issues:
-#### [传播错误]()
+### 传播错误的最佳实践Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| #### [传播错误]() | |
| ### 传播错误的最佳实践 |
Tools
Markdownlint
5-5: null
No empty links(MD042, no-empty-links)
| #### [函数处理回调 是同步还是异步，要统一](./asynchron-api.js) | ||
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There was a problem hiding this comment.
Fix the heading level.
The heading level should be incremented by one level at a time. In this context, the heading should be a level 3 heading.
Apply this diff to fix the heading level:
-#### [函数处理回调 是同步还是异步，要统一](./asynchron-api.js)
+### [函数处理回调 是同步还是异步，要统一](./asynchron-api.js)Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| #### [函数处理回调 是同步还是异步，要统一](./asynchron-api.js) | |
| ### [函数处理回调 是同步还是异步，要统一](./asynchron-api.js) | |
Tools
Markdownlint
3-3: Expected: h3; Actual: h4
Heading levels should only increment by one level at a time(MD001, heading-increment)
| @@ -0,0 +1,16 @@ | |||
| async function a() { | |||
| console.log(1); | |||
| c(); | |||
There was a problem hiding this comment.
Await the async function call.
The function c is called without awaiting it. This might lead to unexpected behavior as the execution of a will continue without waiting for c to complete.
Consider applying this change:
-c();
+await c();Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| c(); | |
| await c(); |
| a(); | ||
| b(); | ||
| // c(); |
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Await the async function calls and remove the redundant invocation.
The async functions a and b are invoked without awaiting them. This might lead to unexpected behavior as the script will exit without waiting for the functions to complete.
Consider applying these changes:
-a();
-b();
+await a();
+await b();
// c();Also, the commented out invocation of c is redundant as it's already called from a. Consider removing it.
Committable suggestion was skipped due to low confidence.
| Animal.call(this, name); | ||
| } | ||
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| Dog.prototype = new Animal(); |
There was a problem hiding this comment.
Consider using Object.create to set the prototype of Dog to avoid potential issues.
Setting the prototype of Dog to an instance of Animal can have unintended consequences, such as if the Animal constructor has side effects or if properties are added to the Animal instance after it is assigned to Dog.prototype.
Consider using Object.create to create a new object with Animal.prototype as its prototype, and assign that to Dog.prototype instead:
-Dog.prototype = new Animal();
+Dog.prototype = Object.create(Animal.prototype);
+Dog.prototype.constructor = Dog;Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| Dog.prototype = new Animal(); | |
| Dog.prototype = Object.create(Animal.prototype); | |
| Dog.prototype.constructor = Dog; |
| function inConsistentRead(filename, callback) { | ||
| if(cache[filename]) { | ||
| // 同步读取 | ||
| callback(cache[filename]); | ||
| } else { | ||
| // 异步读取 | ||
| fs.readFile(filename, "utf8", (err, data) => { | ||
| if(err) { | ||
| throw err; | ||
| } | ||
| cache[filename] = data; | ||
| callback(data); | ||
| }); | ||
| } | ||
| } |
There was a problem hiding this comment.
Make the API consistent, use a local cache, and handle errors properly.
The inConsistentRead function has the following issues:
- It implements an inconsistent API, where it sometimes returns the result synchronously and other times asynchronously. This can lead to confusion and hard-to-debug issues.
- It uses a global
cacheobject, which can cause issues in a multi-threaded environment or with multiple instances of the application. The cache is not thread-safe and can lead to race conditions. - It does not handle errors consistently. It throws an error synchronously if the file read fails, which can crash the application.
To address these issues, apply the following changes:
- Make the API consistently asynchronous by always calling the callback asynchronously, even when the data is cached. You can use
process.nextTickorsetImmediateto call the callback asynchronously. - Use a local cache instead of a global one to avoid issues with multiple instances or threads.
- Pass the error to the callback instead of throwing it synchronously.
Here's an example implementation:
-const cache = {};
-
-function inConsistentRead(filename, callback) {
+function consistentRead(filename, callback) {
+ const cache = {};
+
if(cache[filename]) {
- // 同步读取
- callback(cache[filename]);
+ // 异步读取缓存
+ process.nextTick(() => callback(null, cache[filename]));
} else {
// 异步读取
fs.readFile(filename, "utf8", (err, data) => {
if(err) {
- throw err;
+ return callback(err);
}
cache[filename] = data;
- callback(data);
+ callback(null, data);
});
}
}Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| function inConsistentRead(filename, callback) { | |
| if(cache[filename]) { | |
| // 同步读取 | |
| callback(cache[filename]); | |
| } else { | |
| // 异步读取 | |
| fs.readFile(filename, "utf8", (err, data) => { | |
| if(err) { | |
| throw err; | |
| } | |
| cache[filename] = data; | |
| callback(data); | |
| }); | |
| } | |
| } | |
| function consistentRead(filename, callback) { | |
| const cache = {}; | |
| if(cache[filename]) { | |
| // 异步读取缓存 | |
| process.nextTick(() => callback(null, cache[filename])); | |
| } else { | |
| // 异步读取 | |
| fs.readFile(filename, "utf8", (err, data) => { | |
| if(err) { | |
| return callback(err); | |
| } | |
| cache[filename] = data; | |
| callback(null, data); | |
| }); | |
| } | |
| } |
| function send() { | ||
| console.log("ws", ws); | ||
| console.log("send"); | ||
| ws.send("Hello, server!"); | ||
| } |
There was a problem hiding this comment.
The send function is correctly implemented.
The function is properly sending a message to the WebSocket server when called.
However, the function is sending a hardcoded message. Consider allowing the user to input a custom message to send to the server. You can add an input field in the HTML and retrieve its value in the send function. For example:
<input type="text" id="message" placeholder="Enter your message">function send() {
const message = document.querySelector("#message").value;
ws.send(message);
}| document | ||
| .getElementById("onUpload") | ||
| .addEventListener("click", function () { | ||
| var myFile = document.getElementById("myFile").files; | ||
| var username = document.getElementById("username").value; | ||
| var obj = { age: 1, name: "good" }; | ||
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| /* | ||
| var data = new FormData(); | ||
| data.append("username", username); | ||
| data.append("obj", obj); | ||
| data.append("myFile", myFile); | ||
| */ | ||
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| var data = { | ||
| username, | ||
| myFile, | ||
| obj, | ||
| }; | ||
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| console.log(data); | ||
|
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There was a problem hiding this comment.
Use FormData to structure the data for file uploads.
The commented-out code block that uses FormData is a better approach for structuring the data for file uploads. Please consider using it instead of the current approach.
Apply this diff to use FormData:
-var data = {
- username,
- myFile,
- obj,
-};
+var data = new FormData();
+data.append("username", username);
+data.append("obj", JSON.stringify(obj));
+for (var i = 0; i < myFile.length; i++) {
+ data.append("myFile", myFile[i]);
+}Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| document | |
| .getElementById("onUpload") | |
| .addEventListener("click", function () { | |
| var myFile = document.getElementById("myFile").files; | |
| var username = document.getElementById("username").value; | |
| var obj = { age: 1, name: "good" }; | |
| /* | |
| var data = new FormData(); | |
| data.append("username", username); | |
| data.append("obj", obj); | |
| data.append("myFile", myFile); | |
| */ | |
| var data = { | |
| username, | |
| myFile, | |
| obj, | |
| }; | |
| console.log(data); | |
| document | |
| .getElementById("onUpload") | |
| .addEventListener("click", function () { | |
| var myFile = document.getElementById("myFile").files; | |
| var username = document.getElementById("username").value; | |
| var obj = { age: 1, name: "good" }; | |
| /* | |
| var data = new FormData(); | |
| data.append("username", username); | |
| data.append("obj", obj); | |
| data.append("myFile", myFile); | |
| */ | |
| var data = new FormData(); | |
| data.append("username", username); | |
| data.append("obj", JSON.stringify(obj)); | |
| for (var i = 0; i < myFile.length; i++) { | |
| data.append("myFile", myFile[i]); | |
| } | |
| console.log(data); |
| function sendFormData(url, formData, callback) { | ||
| var xhr = new XMLHttpRequest(); | ||
|
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||
| xhr.onreadystatechange = function () { | ||
| if (xhr.readyState === 4) { | ||
| if (xhr.status === 200) { | ||
| callback(null, xhr.responseText); | ||
| } else { | ||
| callback(new Error("Request failed with status " + xhr.status)); | ||
| } | ||
| } | ||
| }; | ||
|
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| xhr.open("POST", url, true); | ||
|
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| // 设置请求头 | ||
| xhr.setRequestHeader( | ||
| "Content-Type", | ||
| "multipart/form-data; boundary=" + formData.boundary | ||
| ); | ||
|
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||
| // 构建请求体 | ||
| var requestBody = "--" + formData.boundary + "\r\n"; | ||
| formData.entries.forEach(function (entry) { | ||
| requestBody += | ||
| 'Content-Disposition: form-data; name="' + entry.name + '"'; | ||
| if (entry.filename) { | ||
| requestBody += '; filename="' + entry.filename + '"'; | ||
| } | ||
| requestBody += "\r\n"; | ||
| requestBody += "Content-Type: " + entry.contentType + "\r\n"; | ||
| requestBody += "\r\n"; | ||
| requestBody += entry.value + "\r\n"; | ||
| requestBody += "--" + formData.boundary + "\r\n"; | ||
| }); | ||
| requestBody += "--"; | ||
|
|
||
| xhr.send(requestBody); | ||
| } |
There was a problem hiding this comment.
Consider refactoring to use Promises or async/await.
The function correctly constructs the request body and sets the appropriate headers for a multipart/form-data request. However, it uses a callback to handle the response, which is an older style of handling asynchronous operations in JavaScript.
Consider refactoring the function to use Promises or async/await for handling asynchronous operations. This will make the code more readable and easier to reason about.
Here's an example of how the function can be refactored to use Promises:
function sendFormData(url, formData) {
return new Promise((resolve, reject) => {
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
resolve(xhr.responseText);
} else {
reject(new Error("Request failed with status " + xhr.status));
}
}
};
xhr.open("POST", url, true);
xhr.setRequestHeader(
"Content-Type",
"multipart/form-data; boundary=" + formData.boundary
);
var requestBody = "--" + formData.boundary + "\r\n";
formData.entries.forEach(function (entry) {
requestBody +=
'Content-Disposition: form-data; name="' + entry.name + '"';
if (entry.filename) {
requestBody += '; filename="' + entry.filename + '"';
}
requestBody += "\r\n";
requestBody += "Content-Type: " + entry.contentType + "\r\n";
requestBody += "\r\n";
requestBody += entry.value + "\r\n";
requestBody += "--" + formData.boundary + "\r\n";
});
requestBody += "--";
xhr.send(requestBody);
});
}And here's an example of how the function can be used with async/await:
try {
var response = await sendFormData("http://localhost:13000/uploadFile", data);
console.log(response);
} catch (error) {
console.error(error);
}| function fileReader(file) { | ||
| return new Promise((resolve, reject) => { | ||
| var reader = new FileReader(); | ||
| reader.onload = function (e) { | ||
| resolve(e.target.result); | ||
| }; | ||
| reader.onerror = function (e) { | ||
| reject(e); | ||
| }; | ||
| reader.readAsDataURL(file); | ||
| }); | ||
| } |
There was a problem hiding this comment.
Add error handling for invalid file input.
The function correctly uses the FileReader API to read the content of a file and returns a Promise, which is a good practice for handling asynchronous operations in JavaScript.
However, consider adding error handling for cases where the file is not provided or is not a valid file type. This will make the function more robust and prevent unexpected errors.
Here's an example of how error handling can be added:
function fileReader(file) {
return new Promise((resolve, reject) => {
if (!file) {
reject(new Error("No file provided"));
return;
}
if (!file.type.startsWith("image/")) {
reject(new Error("Invalid file type"));
return;
}
var reader = new FileReader();
reader.onload = function (e) {
resolve(e.target.result);
};
reader.onerror = function (e) {
reject(e);
};
reader.readAsDataURL(file);
});
}
1 participant
Summary by CodeRabbit
New Features
.gitignoreto streamline version control by excluding unnecessary files.README.mdfor clearer documentation.README.mdfor thejs-advancedproject, outlining its structure and resources.Bug Fixes
Documentation
README.mdfiles to enhance guidance on design patterns and Node.js case studies.Chores
package.jsonfiles for project metadata and dependencies management.