JavaScript

To check that a JS variable is of a type string, you can use 2 operators: instanceof and typeof. Here’s a quick solution. if (typeof text === 'string' || text instanceof String) { // it's a string!...

To get a random number is JS you almost always rely on the function Math.random. The only issue is that it returns a number between 0 and 1. You can generate a number in a specific range by writing a straightforward function....

The object window.screen holds all the information you about the current screen. You can access the resolution of the screen by accessing its width and height properties. ...

Before you make another step, remember, that strings in JavaScript are immutable. This means that you can’t alter the string by removing something from it. So, when you want to remove the last n symbols from a string in JS, your only option is to create a new string that wouldn’t have these n characters....

To generate a random string in JS you should start by defining the set of characters that will be used to generate that random string. Let’s go! ...

You can add different default values to your JavaScript functions with a simple trick. Let’s see how it works. ...

You can use built-in JavaScript functions encodeURIComponent(str), encodeURI(str) or escape(str) to encode your URLs. Here’s how you can use it. const urlParam = 'https://google.com'; const encodedURL = "https://coderslang.com?ref=" + encodeURIComponent(urlParam); console....

There are 2 ways you can get current date in JavaScript. You can just create a new Date object without any arguments, or you can use the function Date.now. ...

In Node.js the command-line arguments are captured in the object process.argv. Let’s start by logging them to the screen. console.log(process.argv); If you run your script without any arguments, the output will be something like this....

You can append new values to a JS array using the function Array.push. It adds new values to the end of the JavaScript array. ...