Run results for: Cloning arrays

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.32 Safari/537.36

Browser: Chrome 60

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
splice	7361.3 Ops/sec
map	6319.4 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));

Run results for: Cloning arrays

splice

map