Run results for: switch vs if (3)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

switch

1.3M/s

1.0M/s

View exact numbers

Test name	Executions per second
✓ switch	1,349,440 Ops/sec
if	1,002,127 Ops/sec

HTML Preparation code:

<script>
    var arr = [];
    var res = [0, 0];
    var generateRandomInteger = function(min, max) {
        return Math.floor(min + Math.random() * (max - min + 1))
    }
    var test01 = function() {
        let k = 0;
        for (const v of arr) {
            switch (v) {
                case 1:
                    k += 1;
                    break;
                case 2:
                    k += 2;
                    break;
                case 3:
                    k += 3;
                    break;
                case 4:
                    k += 5;
                    break;
                case 5:

                    k += 7;
                    break;
                case 6:
                    k += 11;
                    break;
                case 7:

                    k += 13;
                    break;
                case 8:

                    k += 17;
                    break;
                default:
                    k += 19;;
            }
        }
        res[0] = k;
    }
    var test02 = function() {

        let k = 0;
        for (const v of arr) {
            if (v === 1) {

                k += 1;
            } else if (v === 2) {

                k += 2;
            } else if (v === 3) {

                k += 3;
            } else if (v === 4) {

                k += 5;
            } else if (v === 5) {

                k += 7;
            } else if (v === 6) {

                k += 11;
            } else if (v === 7) {

                k += 13;
            } else if (v === 8) {

                k += 17;
            } else {

                k += 19;
            }
        }
        res[1] = k;

    }
</script>

Script Preparation code:

Benchmark.prototype.setup = function() {
    arr = new Array(256).fill(0).map(e => generateRandomInteger(1, 16));
    if (test01() !== test02()) throw new Error('test error');
};
Benchmark.prototype.teardown = function() {
    arr.length = 0;
    res = [0, 0];
}

Tests:

switch
test01();
if
test02();