Benchmark: Nj9ZJ^FuK4AJ#wKE

Script Preparation code:

var length = 100000;

function* range(from, to, step = 1) {
    if (!step) return;
    if (!to) to = from, from = 0;

    if (from < to && step > 0) {
        while (from < to) {
            yield from;
            from += step;
        }
    } else if (from > to && step < 0) {
        while (from > to) {
            yield from;
            from += step;
        }
    }
}

function* range_undefined(from, to, step = 1) {
    if (!step) return;
    if (!to) to = from, from = 0;

    if (from < to && step > 0) {
        while (from < to) {
            yield;
            from += step;
        }
    } else if (from > to && step < 0) {
        while (from > to) {
            yield;
            from += step;
        }
    }
}

Tests:

fori
for (let i = 0; i < length; i++) {}
lazy range with index number
for (const i of range(length)) {}
range with index number
for (const i of Array.from(Array(length).keys())) {}
range without index number
for (const i of Array.from(Array(length))) {}
lazy range without index number
for (const i of range_undefined(length)) {}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fori
lazy range with index number
range with index number
range without index number
lazy range without index number

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36

Browser/OS: Chrome 96 on Windows

View result in a separate tab

Test name	Executions per second
fori	106.6 Ops/sec
lazy range with index number	533.8 Ops/sec
range with index number	362.4 Ops/sec
range without index number	1583.6 Ops/sec
lazy range without index number	507.7 Ops/sec

Nj9ZJ^FuK4AJ#wKE (version: 0)

Compare loop performance

Comparing performance of: fori vs lazy range with index number vs range with index number vs range without index number vs lazy range without index number

Created: 2 years ago by: Guest

Jump to the latest result

fori

lazy range with index number

range with index number

range without index number

lazy range without index number

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A