Run results for: Dict vs. Map vs. Array ( complete iteration Ultimate Collection)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Array Iterator

31K/s

Array For Index

14K/s

Array Inverse While

12K/s

Map

4K/s

forEach call Array

3K/s

Dictionary

159/s

View exact numbers

Test name	Executions per second
✓ Array Iterator	31,063 Ops/sec
Array For Index	13,566 Ops/sec
Array Inverse While	11,821 Ops/sec
Map	4,276 Ops/sec
forEach call Array	3,263 Ops/sec
Dictionary	159 Ops/sec

Script Preparation code:

var dict= {}
for (var i=0; i<50000; i++) {
  dict['abc_'+i] = i;
}

var map= new Map()
for (var i=0; i<50000; i++) {
  map.set('abc_'+i, i);
}

var arr = []
for (var i=0; i<50000; i++) {
  arr.push(i);
}

Tests:

Dictionary
let c = 0 for (let key in dict) { c += dict[key]}
Array Iterator
let c = 0 for (let entry of arr) { c += entry}
Map
let c = 0 for (let [key, entry] of map) { c += entry}
Array For Index
let c = 0, len = arr.length; for (let i=0; i<len; ++i) { c += arr[i]}
Array Inverse While
let c = 0 let i = arr.length; while(i--){ c += arr[i]; }
forEach call Array
let c = 0; arr.forEach((entry) => c+= entry);