Benchmark Run Result for: Map vs preallocation

Test name	Executions per second
Map	63.0 Ops/sec
Preallocation	434.1 Ops/sec

Script Preparation code:

var array = new Array(1000000).fill(0);

AخA
 
var array = new Array(1000000).fill(0);

Tests:

const array2 = array.map((item, index) => index);

 
const array2 = array.map((item, index) => index);

const array2 = new Array(1000000).fill(0);
for (let i = 0; i < array2.length; i++) array2[i] = i;

 
const array2 = new Array(1000000).fill(0);for (let i = 0; i < array2.length; i++) array2[i] = i;