difference.md

title	tags	author_title	author_url	author_image_url	description	image
difference	array math beginner	Deepak Vishwakarma	https://github.com/deepakshrma	https://avatars2.githubusercontent.com/u/7682731?s=400	Implementation of "difference" in typescript, javascript and deno.	https://www.positronx.io/wp-content/uploads/2018/11/positronx-banner-1152-1.jpg

Returns the difference between two arrays.

Create a Set from b, then use Array.prototype.filter() on a to only keep values not contained in b.

const difference = (a, b) => {
  const s = new Set(b);
  return a.filter((x) => !s.has(x));
};

difference([1, 2, 3], [1, 2, 4]); // [3]