From 902362f7e1dd6714aff991cf9191ead6aae2ee50 Mon Sep 17 00:00:00 2001 From: kevin Date: Tue, 8 Oct 2019 22:12:59 -0500 Subject: [PATCH] adegbola-aiyewumi MVP --- assignments/array-methods.js | 131 +++++++++++++++++++---------------- assignments/callbacks.js | 52 +++++++++----- assignments/closure.js | 69 ++++++++++++++---- 3 files changed, 158 insertions(+), 94 deletions(-) diff --git a/assignments/array-methods.js b/assignments/array-methods.js index f3862361e..edd0966fa 100644 --- a/assignments/array-methods.js +++ b/assignments/array-methods.js @@ -1,79 +1,88 @@ -// A local community center is holding a fund raising 5k fun run and has invited 50 small businesses to make a small donation on their behalf for some much needed updates to their facilities. Each business has assigned a representative to attend the event along with a small donation. +// A local community center is holding a fund raising 5k fun run and has invited 50 small businesses to make a small donation on their behalf for some much needed updates to their facilities. +// Each business has assigned a representative to attend the event along with a small donation. -// Scroll to the bottom of the list to use some advanced array methods to help the event director gather some information from the businesses. +// Scroll to the bottom of the list to use some advanced array methods +// to help the event director gather some information from the businesses. const runners = [ - { id: 1, first_name: "Charmain", last_name: "Seiler", email: "cseiler0@wired.com", shirt_size: "2XL", company_name: "Divanoodle", donation: 75 }, - { id: 2, first_name: "Whitaker", last_name: "Ierland", email: "wierland1@angelfire.com", shirt_size: "2XL", company_name: "Wordtune", donation: 148 }, - { id: 3, first_name: "Julieta", last_name: "McCloid", email: "jmccloid2@yahoo.com", shirt_size: "S", company_name: "Riffpedia", donation: 171 }, - { id: 4, first_name: "Martynne", last_name: "Paye", email: "mpaye3@sciencedaily.com", shirt_size: "XL", company_name: "Wordware", donation: 288 }, - { id: 5, first_name: "Gussy", last_name: "Raraty", email: "graraty4@ucoz.ru", shirt_size: "L", company_name: "Oozz", donation: 291 }, - { id: 6, first_name: "Yule", last_name: "Tommasetti", email: "ytommasetti5@state.gov", shirt_size: "S", company_name: "Yodo", donation: 27 }, - { id: 7, first_name: "Kathie", last_name: "Majury", email: "kmajury6@guardian.co.uk", shirt_size: "3XL", company_name: "Zoomcast", donation: 261 }, - { id: 8, first_name: "Tanner", last_name: "Branton", email: "tbranton7@tmall.com", shirt_size: "2XL", company_name: "Realmix", donation: 28 }, - { id: 9, first_name: "Sarina", last_name: "Lasham", email: "slasham8@toplist.cz", shirt_size: "XL", company_name: "Gigashots", donation: 110 }, - { id: 10, first_name: "Bertie", last_name: "Lonergan", email: "blonergan9@issuu.com", shirt_size: "3XL", company_name: "Skinte", donation: 62 }, - { id: 11, first_name: "Trevor", last_name: "Studd", email: "tstudda@networkadvertising.org", shirt_size: "S", company_name: "Cogidoo", donation: 76 }, - { id: 12, first_name: "Malachi", last_name: "Okeshott", email: "mokeshottb@chron.com", shirt_size: "M", company_name: "DabZ", donation: 91 }, - { id: 13, first_name: "Berget", last_name: "Logsdail", email: "blogsdailc@wix.com", shirt_size: "M", company_name: "Mymm", donation: 9 }, - { id: 14, first_name: "Loise", last_name: "Rivlin", email: "lrivlind@behance.net", shirt_size: "2XL", company_name: "Linktype", donation: 204 }, - { id: 15, first_name: "Christan", last_name: "Kendall", email: "ckendalle@example.com", shirt_size: "XS", company_name: "Skinix", donation: 252 }, - { id: 16, first_name: "Kayla", last_name: "Whitwam", email: "kwhitwamf@deliciousdays.com", shirt_size: "2XL", company_name: "Oyope", donation: 147 }, - { id: 17, first_name: "Heddie", last_name: "Heningam", email: "hheningamg@tripadvisor.com", shirt_size: "L", company_name: "Skinix", donation: 172 }, - { id: 18, first_name: "Mace", last_name: "Ballinger", email: "mballingerh@a8.net", shirt_size: "S", company_name: "Nlounge", donation: 266 }, - { id: 19, first_name: "Nola", last_name: "Abberley", email: "nabberleyi@jalbum.net", shirt_size: "XL", company_name: "Photospace", donation: 148 }, - { id: 20, first_name: "Nadine", last_name: "Tresler", email: "ntreslerj@marketwatch.com", shirt_size: "3XL", company_name: "Wikido", donation: 292 }, - { id: 21, first_name: "Ulrikaumeko", last_name: "Vuittet", email: "uvuittetk@gov.uk", shirt_size: "S", company_name: "Skinte", donation: 102 }, - { id: 22, first_name: "Saunder", last_name: "Spennock", email: "sspennockl@icq.com", shirt_size: "3XL", company_name: "Kwimbee", donation: 213 }, - { id: 23, first_name: "Carmel", last_name: "Woffinden", email: "cwoffindenm@wikispaces.com", shirt_size: "S", company_name: "Rooxo", donation: 137 }, - { id: 24, first_name: "Marielle", last_name: "Kimmel", email: "mkimmeln@jimdo.com", shirt_size: "M", company_name: "Livetube", donation: 96 }, - { id: 25, first_name: "Brucie", last_name: "Burris", email: "bburriso@slate.com", shirt_size: "2XL", company_name: "Wordtune", donation: 128 }, - { id: 26, first_name: "Juan", last_name: "Berzon", email: "jberzonp@soup.io", shirt_size: "3XL", company_name: "Einti", donation: 234 }, - { id: 27, first_name: "Sacha", last_name: "Olsen", email: "solsenq@reverbnation.com", shirt_size: "2XL", company_name: "Viva", donation: 190 }, - { id: 28, first_name: "Jamey", last_name: "O'Nolan", email: "jonolanr@samsung.com", shirt_size: "XL", company_name: "Skinix", donation: 31 }, - { id: 29, first_name: "Morrie", last_name: "Rainard", email: "mrainards@yale.edu", shirt_size: "XS", company_name: "Podcat", donation: 52 }, - { id: 30, first_name: "Fidel", last_name: "Roskelly", email: "froskellyt@ibm.com", shirt_size: "XS", company_name: "Avavee", donation: 5 }, - { id: 31, first_name: "Toni", last_name: "MacSweeney", email: "tmacsweeneyu@parallels.com", shirt_size: "M", company_name: "Jaloo", donation: 82 }, - { id: 32, first_name: "Jessey", last_name: "Walhedd", email: "jwalheddv@slashdot.org", shirt_size: "L", company_name: "Trilia", donation: 5 }, - { id: 33, first_name: "Karola", last_name: "Piper", email: "kpiperw@ucsd.edu", shirt_size: "3XL", company_name: "Yombu", donation: 110 }, - { id: 34, first_name: "Marley", last_name: "Mitchenson", email: "mmitchensonx@webeden.co.uk", shirt_size: "M", company_name: "Zoonoodle", donation: 97 }, - { id: 35, first_name: "Marrilee", last_name: "Thrasher", email: "mthrashery@opensource.org", shirt_size: "XL", company_name: "Bluejam", donation: 17 }, - { id: 36, first_name: "Tye", last_name: "Manie", email: "tmaniez@netscape.com", shirt_size: "L", company_name: "Kanoodle", donation: 30 }, - { id: 37, first_name: "Charleen", last_name: "Sheering", email: "csheering10@mit.edu", shirt_size: "3XL", company_name: "Jatri", donation: 262 }, - { id: 38, first_name: "Valma", last_name: "Eynaud", email: "veynaud11@archive.org", shirt_size: "XS", company_name: "Jaxbean", donation: 212 }, - { id: 39, first_name: "Dollie", last_name: "McDarmid", email: "dmcdarmid12@tinyurl.com", shirt_size: "S", company_name: "Kayveo", donation: 74 }, - { id: 40, first_name: "Minna", last_name: "Hymas", email: "mhymas13@cornell.edu", shirt_size: "XS", company_name: "Vimbo", donation: 101 }, - { id: 41, first_name: "Jsandye", last_name: "Frend", email: "jfrend14@ca.gov", shirt_size: "XS", company_name: "Latz", donation: 156 }, - { id: 42, first_name: "Yevette", last_name: "Hacket", email: "yhacket15@wp.com", shirt_size: "XL", company_name: "Lazzy", donation: 291 }, - { id: 43, first_name: "Hank", last_name: "Zebedee", email: "hzebedee16@ezinearticles.com", shirt_size: "L", company_name: "Gigashots", donation: 241 }, - { id: 44, first_name: "Jodie", last_name: "Stawell", email: "jstawell17@yale.edu", shirt_size: "S", company_name: "Jaxspan", donation: 262 }, - { id: 45, first_name: "Falito", last_name: "Karsh", email: "fkarsh18@pcworld.com", shirt_size: "S", company_name: "Mycat", donation: 239 }, - { id: 46, first_name: "Reginauld", last_name: "Purselowe", email: "rpurselowe19@thetimes.co.uk", shirt_size: "L", company_name: "Jabbersphere", donation: 11 }, - { id: 47, first_name: "Vida", last_name: "Tydd", email: "vtydd1a@dropbox.com", shirt_size: "S", company_name: "Quaxo", donation: 55 }, - { id: 48, first_name: "Anderea", last_name: "MacGiolla Pheadair", email: "amacgiollapheadair1b@xing.com", shirt_size: "2XL", company_name: "Kwimbee", donation: 214 }, - { id: 49, first_name: "Bel", last_name: "Alway", email: "balway1c@ow.ly", shirt_size: "S", company_name: "Voolia", donation: 107 }, - { id: 50, first_name: "Shell", last_name: "Baine", email: "sbaine1d@intel.com", shirt_size: "M", company_name: "Gabtype", donation: 171 }, -]; + { id: 1, first_name: 'Charmain', last_name: 'Seiler', email: 'cseiler0@wired.com', shirt_size: '2XL', company_name: 'Divanoodle', donation: 75 }, + { id: 2, first_name: 'Whitaker', last_name: 'Ierland', email: 'wierland1@angelfire.com', shirt_size: '2XL', company_name: 'Wordtune', donation: 148 }, + { id: 3, first_name: 'Julieta', last_name: 'McCloid', email: 'jmccloid2@yahoo.com', shirt_size: 'S', company_name: 'Riffpedia', donation: 171 }, + { id: 4, first_name: 'Martynne', last_name: 'Paye', email: 'mpaye3@sciencedaily.com', shirt_size: 'XL', company_name: 'Wordware', donation: 288 }, + { id: 5, first_name: 'Gussy', last_name: 'Raraty', email: 'graraty4@ucoz.ru', shirt_size: 'L', company_name: 'Oozz', donation: 291 }, + { id: 6, first_name: 'Yule', last_name: 'Tommasetti', email: 'ytommasetti5@state.gov', shirt_size: 'S', company_name: 'Yodo', donation: 27 }, + { id: 7, first_name: 'Kathie', last_name: 'Majury', email: 'kmajury6@guardian.co.uk', shirt_size: '3XL', company_name: 'Zoomcast', donation: 261 }, + { id: 8, first_name: 'Tanner', last_name: 'Branton', email: 'tbranton7@tmall.com', shirt_size: '2XL', company_name: 'Realmix', donation: 28 }, + { id: 9, first_name: 'Sarina', last_name: 'Lasham', email: 'slasham8@toplist.cz', shirt_size: 'XL', company_name: 'Gigashots', donation: 110 }, + { id: 10, first_name: 'Bertie', last_name: 'Lonergan', email: 'blonergan9@issuu.com', shirt_size: '3XL', company_name: 'Skinte', donation: 62 }, + { id: 11, first_name: 'Trevor', last_name: 'Studd', email: 'tstudda@networkadvertising.org', shirt_size: 'S', company_name: 'Cogidoo', donation: 76 }, + { id: 12, first_name: 'Malachi', last_name: 'Okeshott', email: 'mokeshottb@chron.com', shirt_size: 'M', company_name: 'DabZ', donation: 91 }, + { id: 13, first_name: 'Berget', last_name: 'Logsdail', email: 'blogsdailc@wix.com', shirt_size: 'M', company_name: 'Mymm', donation: 9 }, + { id: 14, first_name: 'Loise', last_name: 'Rivlin', email: 'lrivlind@behance.net', shirt_size: '2XL', company_name: 'Linktype', donation: 204 }, + { id: 15, first_name: 'Christan', last_name: 'Kendall', email: 'ckendalle@example.com', shirt_size: 'XS', company_name: 'Skinix', donation: 252 }, + { id: 16, first_name: 'Kayla', last_name: 'Whitwam', email: 'kwhitwamf@deliciousdays.com', shirt_size: '2XL', company_name: 'Oyope', donation: 147 }, + { id: 17, first_name: 'Heddie', last_name: 'Heningam', email: 'hheningamg@tripadvisor.com', shirt_size: 'L', company_name: 'Skinix', donation: 172 }, + { id: 18, first_name: 'Mace', last_name: 'Ballinger', email: 'mballingerh@a8.net', shirt_size: 'S', company_name: 'Nlounge', donation: 266 }, + { id: 19, first_name: 'Nola', last_name: 'Abberley', email: 'nabberleyi@jalbum.net', shirt_size: 'XL', company_name: 'Photospace', donation: 148 }, + { id: 20, first_name: 'Nadine', last_name: 'Tresler', email: 'ntreslerj@marketwatch.com', shirt_size: '3XL', company_name: 'Wikido', donation: 292 }, + { id: 21, first_name: 'Ulrikaumeko', last_name: 'Vuittet', email: 'uvuittetk@gov.uk', shirt_size: 'S', company_name: 'Skinte', donation: 102 }, + { id: 22, first_name: 'Saunder', last_name: 'Spennock', email: 'sspennockl@icq.com', shirt_size: '3XL', company_name: 'Kwimbee', donation: 213 }, + { id: 23, first_name: 'Carmel', last_name: 'Woffinden', email: 'cwoffindenm@wikispaces.com', shirt_size: 'S', company_name: 'Rooxo', donation: 137 }, + { id: 24, first_name: 'Marielle', last_name: 'Kimmel', email: 'mkimmeln@jimdo.com', shirt_size: 'M', company_name: 'Livetube', donation: 96 }, + { id: 25, first_name: 'Brucie', last_name: 'Burris', email: 'bburriso@slate.com', shirt_size: '2XL', company_name: 'Wordtune', donation: 128 }, + { id: 26, first_name: 'Juan', last_name: 'Berzon', email: 'jberzonp@soup.io', shirt_size: '3XL', company_name: 'Einti', donation: 234 }, + { id: 27, first_name: 'Sacha', last_name: 'Olsen', email: 'solsenq@reverbnation.com', shirt_size: '2XL', company_name: 'Viva', donation: 190 }, + { id: 28, first_name: 'Jamey', last_name: "O'Nolan", email: 'jonolanr@samsung.com', shirt_size: 'XL', company_name: 'Skinix', donation: 31 }, + { id: 29, first_name: 'Morrie', last_name: 'Rainard', email: 'mrainards@yale.edu', shirt_size: 'XS', company_name: 'Podcat', donation: 52 }, + { id: 30, first_name: 'Fidel', last_name: 'Roskelly', email: 'froskellyt@ibm.com', shirt_size: 'XS', company_name: 'Avavee', donation: 5 }, + { id: 31, first_name: 'Toni', last_name: 'MacSweeney', email: 'tmacsweeneyu@parallels.com', shirt_size: 'M', company_name: 'Jaloo', donation: 82 }, + { id: 32, first_name: 'Jessey', last_name: 'Walhedd', email: 'jwalheddv@slashdot.org', shirt_size: 'L', company_name: 'Trilia', donation: 5 }, + { id: 33, first_name: 'Karola', last_name: 'Piper', email: 'kpiperw@ucsd.edu', shirt_size: '3XL', company_name: 'Yombu', donation: 110 }, + { id: 34, first_name: 'Marley', last_name: 'Mitchenson', email: 'mmitchensonx@webeden.co.uk', shirt_size: 'M', company_name: 'Zoonoodle', donation: 97 }, + { id: 35, first_name: 'Marrilee', last_name: 'Thrasher', email: 'mthrashery@opensource.org', shirt_size: 'XL', company_name: 'Bluejam', donation: 17 }, + { id: 36, first_name: 'Tye', last_name: 'Manie', email: 'tmaniez@netscape.com', shirt_size: 'L', company_name: 'Kanoodle', donation: 30 }, + { id: 37, first_name: 'Charleen', last_name: 'Sheering', email: 'csheering10@mit.edu', shirt_size: '3XL', company_name: 'Jatri', donation: 262 }, + { id: 38, first_name: 'Valma', last_name: 'Eynaud', email: 'veynaud11@archive.org', shirt_size: 'XS', company_name: 'Jaxbean', donation: 212 }, + { id: 39, first_name: 'Dollie', last_name: 'McDarmid', email: 'dmcdarmid12@tinyurl.com', shirt_size: 'S', company_name: 'Kayveo', donation: 74 }, + { id: 40, first_name: 'Minna', last_name: 'Hymas', email: 'mhymas13@cornell.edu', shirt_size: 'XS', company_name: 'Vimbo', donation: 101 }, + { id: 41, first_name: 'Jsandye', last_name: 'Frend', email: 'jfrend14@ca.gov', shirt_size: 'XS', company_name: 'Latz', donation: 156 }, + { id: 42, first_name: 'Yevette', last_name: 'Hacket', email: 'yhacket15@wp.com', shirt_size: 'XL', company_name: 'Lazzy', donation: 291 }, + { id: 43, first_name: 'Hank', last_name: 'Zebedee', email: 'hzebedee16@ezinearticles.com', shirt_size: 'L', company_name: 'Gigashots', donation: 241 }, + { id: 44, first_name: 'Jodie', last_name: 'Stawell', email: 'jstawell17@yale.edu', shirt_size: 'S', company_name: 'Jaxspan', donation: 262 }, + { id: 45, first_name: 'Falito', last_name: 'Karsh', email: 'fkarsh18@pcworld.com', shirt_size: 'S', company_name: 'Mycat', donation: 239 }, + { id: 46, first_name: 'Reginauld', last_name: 'Purselowe', email: 'rpurselowe19@thetimes.co.uk', shirt_size: 'L', company_name: 'Jabbersphere', donation: 11 }, + { id: 47, first_name: 'Vida', last_name: 'Tydd', email: 'vtydd1a@dropbox.com', shirt_size: 'S', company_name: 'Quaxo', donation: 55 }, + { id: 48, first_name: 'Anderea', last_name: 'MacGiolla Pheadair', email: 'amacgiollapheadair1b@xing.com', shirt_size: '2XL', company_name: 'Kwimbee', donation: 214 }, + { id: 49, first_name: 'Bel', last_name: 'Alway', email: 'balway1c@ow.ly', shirt_size: 'S', company_name: 'Voolia', donation: 107 }, + { id: 50, first_name: 'Shell', last_name: 'Baine', email: 'sbaine1d@intel.com', shirt_size: 'M', company_name: 'Gabtype', donation: 171 } +] // ==== Challenge 1: Use .forEach() ==== // The event director needs both the first and last names of each runner for their running bibs. Combine both the first and last names and populate a new array called `fullNames`. This array will contain just strings. -let fullNames = []; -console.log(fullNames); +let fullNames = [] +runners.forEach(runner => fullNames.push(runner.first_name + runner.last_name)) +console.log(fullNames) // ==== Challenge 2: Use .map() ==== // The event director needs to have all the runners' first names in uppercase because the director BECAME DRUNK WITH POWER. Populate an array called `firstNamesAllCaps`. This array will contain just strings. -let firstNamesAllCaps = []; -console.log(firstNamesAllCaps); +let firstNamesAllCaps = [] +firstNamesAllCaps = runners.map(runner => runner.first_name.toUpperCase()) +console.log(firstNamesAllCaps) // ==== Challenge 3: Use .filter() ==== // The large shirts won't be available for the event due to an ordering issue. We need a filtered version of the runners array, containing only those runners with large sized shirts so they can choose a different size. This will be an array of objects. -let runnersLargeSizeShirt = []; -console.log(runnersLargeSizeShirt); +let runnersLargeSizeShirt = [] +let runnersLargeSizeShirt = runners.filter(runner => runner.shirt_size === 'L') +console.log(runnersLargeSizeShirt) // ==== Challenge 4: Use .reduce() ==== // The donations need to be tallied up and reported for tax purposes. Add up all the donations and save the total into a ticketPriceTotal variable. -let ticketPriceTotal = 0; -console.log(ticketPriceTotal); +let ticketPriceTotal = 0 +ticketPriceTotal = runners.reduce((total, amount) => { + return total += amount.donation; +}, 0) + +console.log(ticketPriceTotal) // ==== Challenge 5: Be Creative ==== // Now that you have used .forEach(), .map(), .filter(), and .reduce(). I want you to think of potential problems you could solve given the data set and the 5k fun run theme. Try to create and then solve 3 unique problems using one or many of the array methods listed above. diff --git a/assignments/callbacks.js b/assignments/callbacks.js index cb72e70c9..6452c1a38 100644 --- a/assignments/callbacks.js +++ b/assignments/callbacks.js @@ -1,6 +1,8 @@ -// Create a higher order function and invoke the callback function to test your work. You have been provided an example of a problem and a solution to see how this works with our items array. Study both the problem and the solution to figure out the rest of the problems. +// Create a higher order function and invoke the callback function to test your work. +// You have been provided an example of a problem and a solution to see how this works with our items array. +// Study both the problem and the solution to figure out the rest of the problems. -const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum']; +const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum'] /* @@ -13,7 +15,7 @@ const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum']; // SOLUTION: function firstItem(arr, cb) { - return cb(arr[0]); + return cb(arr[0]) } // NOTES ON THE SOLUTION: @@ -25,45 +27,59 @@ const items = ['Pencil', 'Notebook', 'yo-yo', 'Gum']; // TEST 1 (inlined callback): - const test1 = firstItem(items, item => `I love my ${item}!`); + const test1 = firstItem(items, item => `I love my ${item}!`) console.log(test1); // "I love my Pencil!" // TEST 2 (declaring callback before hand): function logExorbitantPrice(article) { - return `this ${article} is worth a million dollars!`; - }; + return `this ${article} is worth a million dollars!` + } - const test2 = firstItem(items, logExorbitantPrice); + const test2 = firstItem(items, logExorbitantPrice) console.log(test2); // "this Pencil is worth a million dollars!" */ - function getLength(arr, cb) { - // getLength passes the length of the array into the callback. + // getLength passes the length of the array into the callback. + return cb(arr.length) } function last(arr, cb) { - // last passes the last item of the array into the callback. + // last passes the last item of the array into the callback. + return cb(arr[arr.length - 1]) } function sumNums(x, y, cb) { - // sumNums adds two numbers (x, y) and passes the result to the callback. + // sumNums adds two numbers (x, y) and passes the result to the callback. + let sumTwoNums = x + y + return cb(sumTwoNums) } function multiplyNums(x, y, cb) { - // multiplyNums multiplies two numbers and passes the result to the callback. + // multiplyNums multiplies two numbers and passes the result to the callback. + let multiplyTwoNums = x * y + return cb(multiplyTwoNums) } function contains(item, list, cb) { - // contains checks if an item is present inside of the given array/list. - // Pass true to the callback if it is, otherwise pass false. + // contains checks if an item is present inside of the given array/list. + // Pass true to the callback if it is, otherwise pass false. + + for (let i = 0; i < array.length; i++) { + if (array[i].contains(item)) { + isContain = true + } else { + isContain = false + } + } + return cb(isContain) } /* STRETCH PROBLEM */ function removeDuplicates(array, cb) { - // removeDuplicates removes all duplicate values from the given array. - // Pass the duplicate free array to the callback function. - // Do not mutate the original array. -} + // removeDuplicates removes all duplicate values from the given array. + // Pass the duplicate free array to the callback function. + // Do not mutate the original array. +} \ No newline at end of file diff --git a/assignments/closure.js b/assignments/closure.js index 4b399c098..9764387df 100644 --- a/assignments/closure.js +++ b/assignments/closure.js @@ -3,31 +3,70 @@ // Keep it simple! Remember a closure is just a function // that manipulates variables defined in the outer scope. // The outer scope can be a parent function, or the top level of the script. +const name = 'Kevin' +function returnName() { + return name +} +returnName() /* STRETCH PROBLEMS, Do not attempt until you have completed all previous tasks for today's project files */ - // ==== Challenge 2: Implement a "counter maker" function ==== const counterMaker = () => { - // IMPLEMENTATION OF counterMaker: - // 1- Declare a `count` variable with a value of 0. We will be mutating it, so declare it using `let`! - // 2- Declare a function `counter`. It should increment and return `count`. - // NOTE: This `counter` function, being nested inside `counterMaker`, - // "closes over" the `count` variable. It can "see" it in the parent scope! - // 3- Return the `counter` function. -}; -// Example usage: const myCounter = counterMaker(); -// myCounter(); // 1 -// myCounter(); // 2 + // IMPLEMENTATION OF counterMaker: + // 1- Declare a `count` variable with a value of 0. We will be mutating it, so declare it using `let`! + // 2- Declare a function `counter`. It should increment and return `count`. + // NOTE: This `counter` function, being nested inside `counterMaker`, + // "closes over" the `count` variable. It can "see" it in the parent scope! + // 3- Return the `counter` function. + + let counterValue = 0 + return function() { + counterValue = counterValue + 1 + return counterValue + } +} +const myCounter = counterMaker() +console.log(myCounter()) + // Example usage: const myCounter = counterMaker() + // myCounter() // 1 + // myCounter() // 2 // ==== Challenge 3: Make `counterMaker` more sophisticated ==== // It should have a `limit` parameter. Any counters we make with `counterMaker` // will refuse to go over the limit, and start back at 1. +const limitParameter = limit => { + let counter = 0 + let maximumCount = counter + + return function counterMaker() { + if (counter > maximumCount) { + counter = 1 + return counter + } else { + return counter++ + } + } +} // ==== Challenge 4: Create a counter function with an object that can increment and decrement ==== const counterFactory = () => { - // Return an object that has two methods called `increment` and `decrement`. - // `increment` should increment a counter variable in closure scope and return it. - // `decrement` should decrement the counter variable and return it. -}; + // Return an object that has two methods called `increment` and `decrement`. + // `increment` should increment a counter variable in closure scope and return it. + // `decrement` should decrement the counter variable and return it. + + let counter = 0 + return { + increment() { + return counter++ + }, + decrement() { + return counter-- + } + } +} + +const objectCounter = counterFactory() +console.log(objectCounter.increment) +console.log(objectCounter.decrement) \ No newline at end of file