const array1 = [1, 2, 3, 4, 5];

const array2 = [3, 4, 5, 6, 7];

​

const difference =

    array1.filter((element) => !array2.includes(element));

const array1 = [1, 2, 3, 4, 5];

const array2 = [3, 4, 5, 6, 7];

​

const difference = [];

    for (let i = 0; i < array1.length; i++) {

        if (array2.indexOf(array1[i]) === -1) {

            difference.push(array1[i]);

        }

    }

const array1 = [1, 2, 3, 4, 5];

const array2 = [3, 4, 5, 6, 7];

​

const set1 = new Set(array1);

const set2 = new Set(array2);

const difference = [...set1].filter(

    (element) => !set2.has(element));

const array1 = [1, 2, 3, 4, 5];

const array2 = [3, 4, 5, 6, 7];

​

const difference = array1.reduce((result, element) => {

    if (array2.indexOf(element) === -1) {

        result.push(element);

    }

    return result;

}, []);