Run results for: Create Square 2D Array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
While Loop with declaration	285314.0 Ops/sec
While Loop with Slice	1484854.5 Ops/sec
While Loop with Push and Slice	1377482.8 Ops/sec
While Loop with Push	282811.1 Ops/sec
Array.from with map	225431.3 Ops/sec
Array.from with map and slice	667623.4 Ops/sec

Script Preparation code:

var size = 15;

Tests:

While Loop with declaration
const array = []; array.length = size; let index = array.length; while (index-- > 0) { const temp = []; temp.length = size; array[index] = temp; }
While Loop with Slice
const array = []; array.length = size; let index = array.length; const temp = []; temp.length = size; while (index-- > 0) array[index] = temp.slice(0);
While Loop with Push and Slice
const array = []; array.length = size; let index = array.length; const temp = []; temp.length = size; while (index-- > 0) array.push(temp.slice(0));
While Loop with Push
const array = []; array.length = size; let index = size; while (index-- > 0) { const temp = []; temp.length = size; array.push(temp); }
Array.from with map
const array = Array.from(Array(size), () => { const temp = []; temp.length = size; return temp; });
Array.from with map and slice
const temp = []; temp.length = size; const array = Array.from(temp, () => temp.slice());