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Online JavaScript Code Editor for Interviews

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JavaScript at CodeInterview

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JavaScript code editor at CodeInterview

Getting Started with Our JavaScript Code Editor

JavaScript is a versatile, high-level programming language that is essential for web development. It allows developers to create dynamic and interactive web pages. JavaScript is known for its simplicity and speed, making it a crucial tool for front-end and back-end development.

This environment runs Node.js 20.5.

We run the code using NodeJS with —harmony flag on, which enables most of the ES6 features.

This JavaScript environment comes with the following installed Libraries:

  • jQuery - A fast, small, and feature-rich JavaScript library.
  • Underscore - A utility-belt library for JavaScript that provides a lot of the functional programming support.
  • Request - Simplified HTTP client.
  • Express - Fast, unopinionated, minimalist web framework for Node.js.
  • Jade - Robust, elegant, feature-rich template engine for Node.js.
  • ShellJS - Portable Unix shell commands for Node.js.
  • Passport - Simple, unobtrusive authentication for Node.js.
  • HTTP - Node.js HTTP module.
  • Sys - Node.js sys module.
  • Lodash - A modern JavaScript utility library delivering modularity, performance, and extras.
  • Async - Utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript.
  • Mocha - A feature-rich JavaScript test framework running on Node.js.
  • Chai - BDD / TDD assertion library for Node.js.
  • Some other libraries are: Sinon, Sinon-Chai, Moment, Connect, Validator, Restify, EJS, WS, Co, When, Helmet, Wrench, Brain, Mustache, Should, Backbone, Forever, Debug

Here is a simple example of how you can use Chai for testing:

const assert = require('chai').assert;

// Example function to test
const add = (a, b) => a + b;

// Test cases
try {
    assert.equal(add(1, 2), 3, 'add(1, 2) should return 3');
    console.log('Test case 1 passed.');

    assert.equal(add(0, 0), 0, 'add(0, 0) should return 0');
    console.log('Test case 2 passed.');

    assert.equal(add(-1, 1), 0, 'add(-1, 1) should return 0');
    console.log('Test case 3 passed.');

} catch (error) {
    console.error(`Test failed: ${error.message}`);

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