Run results for: if len-1 vs direct for-each - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser: Chrome 127

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
if then-1	13096241.0 Ops/sec
directly for-each	16440073.0 Ops/sec
directly for-of	18798458.0 Ops/sec
directly for	12858363.0 Ops/sec
for-each 2	17293394.0 Ops/sec

Script Preparation code:

var xs = [1];

function f(x) {
  return x;
}

Tests:

if then-1
if (xs.length === 1) { f(xs[0]); } else { xs.forEach(f); }
directly for-each
xs.forEach(f);
directly for-of
for (const x of xs) { f(x); }
directly for
for (let i = 0, n = xs.length; i < n; ++i) { f(xs[i]); }
for-each 2
xs.forEach(x => { f(x); });