Run results for: Javascript array deducplication 2.02

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36 OPR/90.0.4480.117

Browser: Opera 90

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
forEach Test	2528296.0 Ops/sec
usingSet Test	941479.1 Ops/sec

Script Preparation code:

var a = [1, 2, 3, 4, 5, 6, 5, 4];
var b = [6, 8, 2, 7, 6, 1, 4, 3];

function usingForEach(l1, l2) {
    let u = []

    l1.forEach(function(item) {
        if (u.indexOf(item) < 0)
            u.push(item);
    });

    l2.forEach(function(item) {
        if (u.indexOf(item) < 0)
            u.push(item);
    });

    return u;
};

function usingSet(l1, l2) {
    let u = l1.concat(l2); // Joins the l1 and l2 arrays together using concatenation.
    return [...new Set(u)]; // Array is converted into a 'Set' in order to remove duplicates, then is converted back into an array using the spread operator.
};

Tests:

forEach Test
var test1 = usingForEach(a,b);
usingSet Test
var test2 = usingSet(a,b);

Run results for: Javascript array deducplication 2.02

electric boogaloo

forEach Test

usingSet Test