How to check if a string is a hexadecimal color in JavaScript

In this Article we will go through how to check if a string is a hexadecimal color 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 isHexColor = color => /^#([0-9A-F]{3}|[0-9A-F]{4}|[0-9A-F]{6}|[0-9A-F]{8})$/i.test(color);

isHexColor('#012');         // true
isHexColor('#A1B2C3');      // true
isHexColor('012');          // false
isHexColor('#GHIJKL');      // false