Remove entry from array using another array

Question

Not sure how do to this, so any help is greatly appreciated

Say I have :

const array1 = [1, 1, 2, 3, 4];
const array2 = [1, 2];

Desired

Answer 1

You could take a Map for counting the items for removing.

const
    array1 = [1, 1, 2, 3, 4],
    array2 = [1, 2],
    remove = array2.reduce((m, v) => m.set(v, (m.get(v) || 0) + 1), new Map),
    result = array1.filter(v => !remove.get(v) || !remove.set(v, remove.get() - 1));

console.log(...result);