JavaScript

You can use jsbeautifier library to format your JavaScript code from the command line. Quick Guide To use this library, install it first by running the following command in the command-line window. This assumes you have pip installed. Then use it on a JavaScript file by calling (assuming the file is in the same folder

To use Javascript promises in a for loop, use async/await. Here is a code skeleton for the correct approach: This waits for each promiseAction to complete before continuing to the next iteration in the loop. For comparison, here is the incorrect approach you were probably thinking of: In this guide, you learn how async/await works

This quick guide teaches you how to loop through a table of URLs and put the URLs into an array of strings using JavaScript. Here’s a piece of code that loops through a table of URLs on an HTML table of a webpage’s sitemap. It turns the table of URLs into an array of strings

To remove the first element of an array in JavaScript, use the built-in shift() function. For example, let’s return number 1 from this array of numbers: Result: Notice that shift() also returns the removed element. This is useful if you want to use it later. To use this returned element, store it into a variable

To sort an array of arrays in JavaScript, pass a custom comparison function into the sort() function call. For example, let’s sort an array of arrays based on the second element in ascending order: Result: How Does It Work? To learn how this code works, you need to understand how basic sorting works in JavaScript.