How to remove empty lines of a text document in JavaScript

In this Article we will go through how to remove empty lines of a text document 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 removeEmptyLines = str => str.split(/\r?\n/).filter(line => line.trim() !== '').join('\n');

removeEmptyLines(`red

green
blue

yellow`);

/* Output */
/*
red
green
blue
yellow
*/