hsl-to-array-or-object.md

title	shortTitle	type	language	tags	cover	excerpt	dateModified
Convert an HSL color string to a JavaScript array or object	HSL to array or object	story	javascript	string regexp	number-2	Easily convert an `hsl()` color string to an array of values or an object with the values of each color.	2024-03-07

Converting a color string to a more usable format, such as an array of values or an object with the values of each color, allows you to more easily manipulate and work with colors in JavaScript. Here's how you can convert an hsl() color string to a JavaScript array or object.

Note

Converting between other color formats and rgb() might be a prerequisite in many cases. This topic is covered in length in a previous article.

Convert an hsl() color string to an array

An hsl() color string may contain spaces, commas and percentage signs. However, using an appropriate regular expression combined with String.prototype.match() allows you to easily extract the numeric values from the string. Then, using Array.prototype.map() in combination with Number allows you to convert them into an array of numeric values.

const toHSLArray = hslStr => hslStr.match(/\d+/g).map(Number);

toHSLArray('hsl(50, 10%, 10%)'); // [50, 10, 10]

Convert an hsl() color string to an object

The steps for converting an hsl() color string to an object with the values of each color are almost identical to the previous approach. The only difference is you need to store the values into named variables and create an appropriate object from them, which can be done using array destructuring.

const toHSLObject = hslStr => {
  const [hue, saturation, lightness] = hslStr.match(/\d+/g).map(Number);
  return { hue, saturation, lightness };
};

toHSLObject('hsl(50, 10%, 10%)'); // { hue: 50, saturation: 10, lightness: 10 }