Run results for: Cloning arrays

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 YaBrowser/24.4.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

map

363K/s

splice

64K/s

View exact numbers

Test name	Executions per second
✓ map	362,622 Ops/sec
splice	64,149 Ops/sec

Script Preparation code:

var original = new Array(100);
for (let r = 0; r < 100; r++) {
  original[r] = [];
  for (let c = 0; c < 100; c++) {
    original[r][c] = r * 100 + c;
  }
}

Tests:

splice
var copy = new Array(original.length); for (let r = 0; r < original.length; r++) { copy[r] = original[r].splice(0); }
map
var copy = original.map(row => row.splice(0));