How to count the number of words in a string in JavaScript

In this Article we will go through how to count the number of words in 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 countWords = str => str.trim().split(/\s+/).length;

countWords('Hello World');        // 2
countWords('Hello    World');     // 2
countWords('  Hello  World  ');   // 2