Sometimes, we want to find elements in array that are not in another array with JavaScript.
In this article, we’ll look at how to find elements in array that are not in another array with JavaScript.
How to find elements in array that are not in another array with JavaScript?
To find elements in array that are not in another array with JavaScript, we use the filter and includes method.
For instance, we write
const a1 = ["a", "b", "c", "t"];
const a2 = ["d", "a", "t", "e", "g"];
console.log(a2.filter((x) => !a1.includes(x)));
to call filter with a callback that checks if item x in a2 isn’t a1 with includes and negation.
An array with the items in a2 not in a1 is returned.
Conclusion
To find elements in array that are not in another array with JavaScript, we use the filter and includes method.
