How to decapitalize a string in JavaScript

In this Article we will go through how to decapitalize 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 decapitalize = str => `${str.charAt(0).toLowerCase()}${str.slice(1)}`;

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

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