javascript array unique Set spread code example

Example 1: js unique using set

let uniqueArray = [...new Set([5,5,2,2,2,4,2])];
// [5,2,4]

Example 2: how to get unique values from array in javascript without duplicate value

function uniqueArray2(arr) {
    var a = [];
    for (var i=0, l=arr.length; i<l; i++)
        if (a.indexOf(arr[i]) === -1 && arr[i] !== '')
            a.push(arr[i]);
    return a;
}