Check if array contains all elements of another array

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You can combine the .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));  // true
console.log(checker(array3, array1));  // false

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