Check if array contains all elements of another array

Question

I want a function that returns true if and only if a given array includes all the elements of a given "target" array. As follows.

const         


        

Answer 1

You can use .every() and .includes() methods:

let array1 = [1,2,3],
    array2 = [1,2,3,4],
    array3 = [1,2];

let checker = (arr, target) => target.every(v => arr.includes(v));

console.log(checker(array2, array1));
console.log(checker(array3, array1));