How to capitalize a string in JavaScript

In this Article we will go through how to capitalize a string only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const capitalize = str => `${str.charAt(0).toUpperCase()}${str.slice(1)}`;

const capitalize = ([first, ...rest]) => `${first.toUpperCase()}${rest.join('')}`;

capitalize('hello world');      // 'Hello world'