compare two arrays and return the difference javascript

                                    function diffArray(arr1, arr2) {
  return arr1
    .concat(arr2)
    .filter(item => !arr1.includes(item) || !arr2.includes(item));
}

                                    function arrayDiff (a1, a2) {<br/>    var a = [], diff = [];<br/>    for (var i = 0; i &lt; a1.length; i++) {<br/>        a[a1[i]] = true;<br/>    }<br/>    for (var i = 0; i &lt; a2.length; i++) {<br/>        if (a[a2[i]]) {<br/>            delete a[a2[i]];<br/>        } else {<br/>            a[a2[i]] = true;<br/>        }<br/>    }<br/>    for (var k in a) {<br/>        diff.push(k);<br/>    }<br/>    return diff;<br/>}<br/>//usage:<br/>console.log(arrayDiff(['red', 'white','green'], [ 'red','white', 'blue']));//[&quot;green&quot;, &quot;blue&quot;]

                                    const equals = (a, b) => JSON.stringify(a) === JSON.stringify(b);
let arr1 = ['1','2'];
let arr2 = ['1','2'];
equals(arr1,arr2)//this return false , if not equal then its return false

                                    let difference = arr1
                 .filter(x => !arr2.includes(x))
                 .concat(arr2.filter(x => !arr1.includes(x)));