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Add lesson 4
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lessons/lesson03/lesson.md

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[FizzBuzz task](https://codesandbox.io/s/github/JavaScript-Basic-OTUS/otus--jsbasic/tree/fizzbuzz/lessons/lesson03/code/fizzbuzz)
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[FizzBuzz task](https://codesandbox.io/s/github/JavaScript-Basic-OTUS/otus--jsbasic/tree/master/lessons/lesson03/code/fizzbuzz)
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<title>isEqualXAndO</title>
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</head>
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<body>
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<h1>isEqualXAndO</h1>
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<p>
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Given an input string, you should check if the string contains the same
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amount of `x` and `o`. The case doesn't matter - if the amount is equal,
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return a `true` otherwise return `false`
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</p>
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<p>
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Для данной строки нужно проверить, что она содержит одинаковое число `x` и
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`o`. Регистр не имеет значения. Если число вхождений одинаковое - вернуть
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`true`, иначе `false`
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</p>
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<script src="src/isEqualXAndO.js"></script>
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</body>
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</html>
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{
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"name": "isequalxando",
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"version": "1.0.0",
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"description": "",
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"main": "index.html",
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"scripts": {
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"start": "parcel index.html --open",
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"build": "parcel build index.html"
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},
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"dependencies": {},
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"devDependencies": {
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"@babel/core": "7.2.0",
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"parcel-bundler": "^1.6.1"
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},
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"keywords": []
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}
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/**
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* Для данной строки нужно проверить, что она содержит одинаковое число `x` и `o`.
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* Регистр не имеет значения.
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* Если число вхождений одинаковое - вернуть true, иначе false
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* @param {string} str - строка для проверки на палиндром
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* @returns {boolean}
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*/
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export function isEqualXAndO(str) {}
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import { isEqualXAndO } from "./isEqualXAndO";
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node_modules
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yarn.lock
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module.exports = {
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presets: [
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[
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"@babel/preset-env",
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{
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targets: "defaults",
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},
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],
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],
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env: {
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test: {
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plugins: ["@babel/plugin-transform-runtime"],
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},
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},
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};
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<!DOCTYPE html>
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<html>
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<head>
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<title>Parcel Sandbox</title>
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<meta charset="UTF-8" />
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</head>
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<body>
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<div>
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<strong>Задача:</strong><br />
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Создать калькулятор:
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<ul>
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<li>поле ввода, кнопка, блок истории</li>
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<li>
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при вводе выражения и нажатии на ввод (или нажатии на кнопку)
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выражение вычисляется
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</li>
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<li>выражение и результат добавляются в блок истории ниже</li>
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<li>значение поля формы очищается</li>
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</ul>
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</div>
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<div id="app"></div>
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<script src="src/index.js"></script>
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</body>
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</html>
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/*
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* For a detailed explanation regarding each configuration property, visit:
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* https://jestjs.io/docs/en/configuration.html
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*/
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module.exports = {
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// All imported modules in your tests should be mocked automatically
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// automock: false,
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// Stop running tests after `n` failures
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// bail: 0,
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// The directory where Jest should store its cached dependency information
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// cacheDirectory: "/private/var/folders/lk/43_9gcg50wz66lrs2vq9ss_w0000gp/T/jest_dy",
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// Automatically clear mock calls and instances between every test
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clearMocks: true,
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// Indicates whether the coverage information should be collected while executing the test
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// collectCoverage: false,
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// An array of glob patterns indicating a set of files for which coverage information should be collected
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// collectCoverageFrom: undefined,
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// The directory where Jest should output its coverage files
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coverageDirectory: "coverage",
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// An array of regexp pattern strings used to skip coverage collection
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// coveragePathIgnorePatterns: [
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// "/node_modules/"
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// ],
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// Indicates which provider should be used to instrument code for coverage
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coverageProvider: "v8",
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// A list of reporter names that Jest uses when writing coverage reports
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// coverageReporters: [
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// "json",
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// "text",
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// "lcov",
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// "clover"
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// ],
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// An object that configures minimum threshold enforcement for coverage results
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// coverageThreshold: undefined,
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// A path to a custom dependency extractor
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// dependencyExtractor: undefined,
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// Make calling deprecated APIs throw helpful error messages
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// errorOnDeprecated: false,
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// Force coverage collection from ignored files using an array of glob patterns
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// forceCoverageMatch: [],
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// A path to a module which exports an async function that is triggered once before all test suites
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// globalSetup: undefined,
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// A path to a module which exports an async function that is triggered once after all test suites
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// globalTeardown: undefined,
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// A set of global variables that need to be available in all test environments
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// globals: {},
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// The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
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// maxWorkers: "50%",
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// An array of directory names to be searched recursively up from the requiring module's location
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// moduleDirectories: [
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// "node_modules"
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// ],
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// An array of file extensions your modules use
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// moduleFileExtensions: [
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// "js",
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// "json",
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// "jsx",
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// "ts",
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// "tsx",
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// "node"
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// ],
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// A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
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// moduleNameMapper: {},
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// An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
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// modulePathIgnorePatterns: [],
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// Activates notifications for test results
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// notify: false,
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// An enum that specifies notification mode. Requires { notify: true }
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// notifyMode: "failure-change",
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// A preset that is used as a base for Jest's configuration
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// preset: undefined,
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// Run tests from one or more projects
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// projects: undefined,
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// Use this configuration option to add custom reporters to Jest
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// reporters: undefined,
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// Automatically reset mock state between every test
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// resetMocks: false,
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// Reset the module registry before running each individual test
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// resetModules: false,
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// A path to a custom resolver
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// resolver: undefined,
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// Automatically restore mock state between every test
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// restoreMocks: false,
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// The root directory that Jest should scan for tests and modules within
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// rootDir: undefined,
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// A list of paths to directories that Jest should use to search for files in
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// roots: [
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// "<rootDir>"
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// ],
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// Allows you to use a custom runner instead of Jest's default test runner
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// runner: "jest-runner",
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// The paths to modules that run some code to configure or set up the testing environment before each test
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// setupFiles: [],
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// A list of paths to modules that run some code to configure or set up the testing framework before each test
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// setupFilesAfterEnv: [],
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// The number of seconds after which a test is considered as slow and reported as such in the results.
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// slowTestThreshold: 5,
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// A list of paths to snapshot serializer modules Jest should use for snapshot testing
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// snapshotSerializers: [],
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// The test environment that will be used for testing
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// testEnvironment: "jest-environment-jsdom",
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// Options that will be passed to the testEnvironment
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// testEnvironmentOptions: {},
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// Adds a location field to test results
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// testLocationInResults: false,
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// The glob patterns Jest uses to detect test files
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// testMatch: [
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// "**/__tests__/**/*.[jt]s?(x)",
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// "**/?(*.)+(spec|test).[tj]s?(x)"
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// ],
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// An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
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// testPathIgnorePatterns: [
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// "/node_modules/"
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// ],
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// The regexp pattern or array of patterns that Jest uses to detect test files
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// testRegex: [],
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// This option allows the use of a custom results processor
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// testResultsProcessor: undefined,
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// This option allows use of a custom test runner
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// testRunner: "jasmine2",
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// This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
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// testURL: "http://localhost",
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// Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
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// timers: "real",
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// A map from regular expressions to paths to transformers
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// transform: undefined,
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// An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
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// transformIgnorePatterns: [
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// "/node_modules/",
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// "\\.pnp\\.[^\\/]+$"
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// ],
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// An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
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// unmockedModulePathPatterns: undefined,
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// Indicates whether each individual test should be reported during the run
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// verbose: undefined,
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// An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
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// watchPathIgnorePatterns: [],
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// Whether to use watchman for file crawling
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// watchman: true,
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};
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{
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"name": "uicalculator",
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"version": "1.0.0",
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"description": "JavaScript example starter project",
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"main": "index.html",
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"scripts": {
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"start": "parcel index.html --open",
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"build": "parcel build index.html",
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"test": "jest"
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},
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"dependencies": {},
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"devDependencies": {
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"@babel/core": "^7.12.3",
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"@babel/plugin-transform-runtime": "^7.12.1",
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"babel-jest": "^26.6.3",
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"jest": "^26.6.3",
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"parcel-bundler": "^1.6.1"
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},
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"keywords": [
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"javascript",
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"starter"
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],
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"jest": {
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"transform": {
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"\\.[jt]sx?$": "babel-jest"
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}
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}
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}

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