Run results for: Map vs Map vs Foreach vs for - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Overwrite	142550.1 Ops/sec
Dont overwrite	140341.1 Ops/sec
forEach	428016.8 Ops/sec
for	7245.7 Ops/sec

Website performance monitoring

Script Preparation code:

var a = new Array(1000);
for (let i = 0; i < a.length; i++) {
  a[i] = {};
}

Tests:

Overwrite
a = a.map((row) => { row.checked = true; return row; });
Dont overwrite
const b = a.map((row) => { row.checked = true; return row; });
forEach
a.forEach((row) => { row.checked = true; });
for
for(let i=0; i<a.length; i++) { a[i].checked = true; }