How to trim the file extension from a file name in JavaScript

In this Article we will go through how to trim the file extension from a file name 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 trimExt = fileName => fileName.indexOf('.') === -1 ? fileName : fileName.split('.').slice(0, -1).join('.');

trimExt('document');            // document
trimExt('document.pdf');        // document
trimExt('document.2020.pdf');   // document.2020