es-toolkit/docs/reference/array/intersection.md

intersection

Returns the intersection of two arrays.

This function takes two arrays and returns a new array containing the elements that are present in both arrays. It effectively filters out any elements from the first array that are not found in the second array.

Signature

function intersection<T>(firstArr: T[], secondArr: T[]): T[];

Parameters

• firstArr (T[]): The first array to compare.
• secondArr (T[]): The second array to compare.

Returns

(T[]) A new array containing the elements that are present in both arrays.

Examples

const array1 = [1, 2, 3, 4, 5];
const array2 = [3, 4, 5, 6, 7];
const result = intersection(array1, array2);
// result will be [3, 4, 5] since these elements are in both arrays.