Learn how to detect undefined object properties in JavaScript the correct way.

Here are two quick and elegant ways to check if a string is empty in Python.

Pretty-printing JSON objects in pretty easy and customizable in JavaScript. Here's the gist of it.

Let's have a look at how to check if a string contains a substring in JavaScript.

You've probably come across the double negation operator (!!) before, but do you know what it does?

Creates a horizontally scrollable image gallery.

Classifies a data point relative to a labelled data set, using the k-nearest neighbors algorithm.

Creates a custom hover and focus effect for navigation items, using CSS transformations.

Creates a styled checkbox with animation on state change.

A hover effect where the gradient follows the mouse cursor.