How to easily parse URL in JavaScript and access components like hostname, pathname, query, or hash.

3 ways to check if a value is an array in JavaScript: Array.isArray(), instanceof Array and toString() === '[object Array]'.

How to get the screen, browser window, and web page sizes (width and height) in JavaScript.

The 3 ways to check if an object has a property in JavaScript: hasOwnProperty() method, in operator, comparing with undefined.

How to compare objects in JavaScript: referential, manual, shallow and deep equality.

When should you use Object.is() instead of strict equality check in JavaScript?

Knowing the difference between own and inherited properties helps understanding the JavaScript prototypal inheritance.

The 5 must-know differences between arrow and regular functions in JavaScript.

The object destructuring is a JavaScript feature to extract properties from objects and bind them to variables.

React.useCallback() memoizes callback functions. In this post I will explain when to and when not to use React.useCallback().