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?

Renders a checkbox list that uses a callback function to pass its selected value/values to the parent component.

Displays a menu overlay when the user hovers over the image.

Returns the human-readable format of the given number of milliseconds.

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

Renders a textarea component with a word limit.