Método indexOf

logic-exercises/indexOf/.gitignore

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+node_modules
+package-lock.json
+build

logic-exercises/indexOf/jest.config.js

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+module.exports = {
+    roots: ["<rootDir>/tests"],
+    transform: {
+    "^.+\\.tsx?$": "ts-jest",
+    },
+    testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
+    moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
+   };

logic-exercises/indexOf/package.json

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+{
+  "name": "indexOf",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "dependencies": {
+    "jest": "^27.4.7",
+    "ts-jest": "^27.1.3",
+    "ts-node-dev": "^1.1.8"
+  },
+  "devDependencies": {
+    "@types/jest": "^27.4.0",
+    "@types/node": "^17.0.14",
+    "typescript": "^4.5.5"
+  },
+  "scripts": {
+    "dev": "ts-node-dev --transpile-only --ignore-watch node_modules ./src/index.ts",
+    "test": "clear && jest",
+    "start": "tsc && node ./build/src/index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}

logic-exercises/indexOf/src/index.ts

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+export const indexOf = (
+    fonte: string,
+    elementoDaPesquisa: string,
+    mainIndex: number = 0,
+    fonteIndex: number = 0,
+    elementoDaPesquisaIndex: number = 0
+  ): number => {
+      //não existe 
+    if (fonteIndex > fonte.length) {
+      return -1;
+    }
+
+    if (elementoDaPesquisaIndex >= elementoDaPesquisa.length) {
+      return mainIndex;
+    }
+
+    if (fonte[fonteIndex] === elementoDaPesquisa[elementoDaPesquisaIndex]) {
+      return indexOf(fonte, elementoDaPesquisa, mainIndex, fonteIndex + 1, elementoDaPesquisaIndex + 1);
+    } else {
+      return indexOf(fonte, elementoDaPesquisa, mainIndex + 1, mainIndex + 1, 0);
+    }
+  };

logic-exercises/indexOf/tests/index.test.ts

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+import { indexOf } from "../src"
+
+test("indexOfMétodo", ()=>{
+
+    const fonte = "abcdefghijklmnopqrstuvwxyz"
+    const elementoDaPesquisa1 = "c"
+    const elementoDaPesquisa2 = "2"
+
+    const result1 = indexOf(fonte,elementoDaPesquisa1)
+    const result2 = indexOf(fonte,elementoDaPesquisa2)
+
+    expect(result1).toBe(2);
+    expect(result2).toBe(-1);
+
+
+})

logic-exercises/indexOf/tsconfig.json

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+{
+  "compilerOptions": {
+   "target": "es6" ,
+   "module": "commonjs",
+   "outDir": "./build" ,
+   "rootDir": "./" ,
+   "strict": true ,
+   "sourceMap": true,
+   "removeComments": true,
+   "esModuleInterop": true ,
+   "forceConsistentCasingInFileNames": true
+   }
+  }