CSS values of a pseudo-element can be retrieved in Javascript using the window.getComputedStyle() method.

The window.getComputedStyle() method can be used to get current values of CSS properties of an element.

The browser allots a specific amount of space to each website that is visited. This used space and the space remaining can be found with the StorageManager API.

The Web Storage API helps web applications to store data in the user's browser. As compared to cookies a lot more data can be saved.

Destructuring can be used in Javascript to cut down the amount of code to write. This tutorial explains some possible use-cases of destructuring.

Javascript destructuring operator can be used on objects to copy multiple properties to given variables in a single line of code.

jQuery ready() can be implemented in native Javascript by listening to the DOMContentLoaded event. This event is fired when DOM is ready for manipulation.

The destructuring operator helps to assign values to variables from an array or object in a shorter syntax. It can shorten the amount of code to write for simple assignment statements.

The Spread operator denoted by three dots provides a shorter syntax to merge objects Only enumerable properties of the object can be copied.

Array.reduce() and Array.reduceRight() are methods that can be used to process each element in array through a defined way, and get a single output combining all.

Cleave.js is a Javascript library that helps in formatting input text while the user is typing. Date, time, credit cards, phone numbers, currencies etc are supported.

Type of a variable can be checked with 2 Javascript operators - typeof checks for a primitive data type, while instanceof operator checks whether it is a special kind of an object.

While dealing with mathematical calculations we need to make sure that the variable in question is actually a number. Any variable can be converted to a number using the global Number() method.

There are situations where an application needs to wait for the completion of multiple Promises and needs to know when they have all finished. In such cases Promise.all() or Promise.allSettled() methods can be used.

Immutable.js is a library for dealing with immutable data structures in Javascript. With this we can create immutable arrays and objects, and perform operations on them.

Data immutability becomes important when there are several developers working on a huge web application. This video shows how you can create immutable objects in Javascript.

ES6 has introduced the includes() method which a better way of detecting substring in a given string.

In rare cases we may need to execute some Javascript code depending upon a specific media query. This can be done with the help of window.matchMedia object.

Reading a URL and getting information about its various components - hostname, path, parameters etc is one of the common things required in Javascript. This tutorial tells how we can read any url, and get its component parts.

In some case we may need to change the value of the CSS variable dynamically, or get the value of the variable in Javascript. This can be done using the native browser APIs.