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How to use deepCyclicCopyArray method in Jest

Best JavaScript code snippet using jest

deep_cyclic_copy.js

Source:deep_cyclic_copy.js

...30    return value;31  } else if (cycles.has(value)) {32    return cycles.get(value);33  } else if (Array.isArray(value)) {34    return deepCyclicCopyArray(value, options, cycles);35  } else {36    return deepCyclicCopyObject(value, options, cycles);37  }38}39function deepCyclicCopyObject(object, options, cycles) {40  const newObject = options.keepPrototype ? Object.create(Object.getPrototypeOf(object)) : {};41  // $FlowFixMe: Object.getOwnPropertyDescriptors is polyfilled above.42  const descriptors = Object.getOwnPropertyDescriptors(object);43  cycles.set(object, newObject);44  Object.keys(descriptors).forEach(key => {45    if (options.blacklist && options.blacklist.has(key)) {46      delete descriptors[key];47      return;48    }49    const descriptor = descriptors[key];50    if (typeof descriptor.value !== 'undefined') {51      descriptor.value = deepCyclicCopy(descriptor.value, { blacklist: EMPTY, keepPrototype: options.keepPrototype }, cycles);52    }53    descriptor.configurable = true;54  });55  return Object.defineProperties(newObject, descriptors);56}57function deepCyclicCopyArray(array, options, cycles) {58  const newArray = options.keepPrototype ? // $FlowFixMe: getPrototypeOf an array is OK.59  new (Object.getPrototypeOf(array).constructor)(array.length) : [];60  const length = array.length;61  cycles.set(array, newArray);62  for (let i = 0; i < length; i++) {63    newArray[i] = deepCyclicCopy(array[i], { blacklist: EMPTY, keepPrototype: options.keepPrototype }, cycles);64  }65  return newArray;...

deepCyclicCopy.js

Source:deepCyclicCopy.js

...36    return value;37  } else if (cycles.has(value)) {38    return cycles.get(value);39  } else if (Array.isArray(value)) {40    return deepCyclicCopyArray(value, options, cycles);41  } else {42    return deepCyclicCopyObject(value, options, cycles);43  }44}45function deepCyclicCopyObject(object, options, cycles) {46  const newObject = options.keepPrototype47    ? Object.create(Object.getPrototypeOf(object))48    : {};49  const descriptors = Object.getOwnPropertyDescriptors(object);50  cycles.set(object, newObject);51  Object.keys(descriptors).forEach(key => {52    if (options.blacklist && options.blacklist.has(key)) {53      delete descriptors[key];54      return;55    }56    const descriptor = descriptors[key];57    if (typeof descriptor.value !== 'undefined') {58      descriptor.value = deepCyclicCopy(59        descriptor.value,60        {61          blacklist: EMPTY,62          keepPrototype: options.keepPrototype63        },64        cycles65      );66    }67    descriptor.configurable = true;68  });69  return Object.defineProperties(newObject, descriptors);70}71function deepCyclicCopyArray(array, options, cycles) {72  const newArray = options.keepPrototype73    ? new (Object.getPrototypeOf(array)).constructor(array.length)74    : [];75  const length = array.length;76  cycles.set(array, newArray);77  for (let i = 0; i < length; i++) {78    newArray[i] = deepCyclicCopy(79      array[i],80      {81        blacklist: EMPTY,82        keepPrototype: options.keepPrototype83      },84      cycles85    );...

Jest Testing Tutorial

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What is Jest Framework
Advantages of Jest - Jest has 3,898,000 GitHub repositories, as mentioned on its official website. Learn what makes Jest special and why Jest has gained popularity among the testing and developer community.
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Using Jest with NodeJS Project - Learn how to leverage Jest framework to automate testing using a NodeJS Project.
Writing First Test for Jest Framework - Get started with code-based tutorial to help you write and execute your first Jest framework testing script.
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Unit Testing with Jest - Step-by-step tutorial to help you execute unit testing with Jest framework.
Jest Basics - Learn about the most pivotal and basic features which makes Jest special.
Jest Parameterized Tests - Avoid code duplication and fasten automation testing with Jest using parameterized tests. Parameterization allows you to trigger the same test scenario over different test configurations by incorporating parameters.
Jest Matchers - Enforce assertions better with the help of matchers. Matchers help you compare the actual output with the expected one. Here is an example to see if the object is acquired from the correct class or not. -

|it('check_object_of_Car', () => { expect(newCar()).toBeInstanceOf(Car); });| | :- |

Jest Hooks: Setup and Teardown - Learn how to set up conditions which needs to be followed by the test execution and incorporate a tear down function to free resources after the execution is complete.
Jest Code Coverage - Unsure there is no code left unchecked in your application. Jest gives a specific flag called --coverage to help you generate code coverage.
HTML Report Generation - Learn how to create a comprehensive HTML report based on your Jest test execution.
Testing React app using Jest Framework - Learn how to test your react web-application with Jest framework in this detailed Jest tutorial.
Test using LambdaTest cloud Selenium Grid - Run your Jest testing script over LambdaTest cloud-based platform and leverage parallel testing to help trim down your test execution time.
Snapshot Testing for React Front Ends - Capture screenshots of your react based web-application and compare them automatically for visual anomalies with the help of Jest tutorial.
Bonus: Import ES modules with Jest - ES modules are also known as ECMAScript modules. Learn how to best use them by importing in your Jest testing scripts.
Jest vs Mocha vs Jasmine - Learn the key differences between the most popular JavaScript-based testing frameworks i.e. Jest, Mocha, and Jasmine.
Jest FAQs(Frequently Asked Questions) - Explore the most commonly asked questions around Jest framework, with their answers.