JSFiddle - React, Tailwind, and code Playground

JavaScript

function differenceOf2Arrays(arr1, arr2) {
    const temp = [];
    arr1 = arr1.toString().split(',').map(Number);
    arr2 = arr2.toString().split(',').map(Number);

    for (var i in arr1) {
        if (!arr2.includes(arr1[i])) temp.push(arr1[i]);
    }
    for (i in arr2) {
        if (!arr1.includes(arr2[i])) temp.push(arr2[i]);
    }
    return temp.sort((a, b) => a - b);
}

console.log(differenceOf2Arrays([1, 2, 3], [100, 2, 1, 10]));