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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0

Browser: Firefox 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Array

15K/s

Map

2K/s

Dictionary

794/s

View exact numbers

Test name	Executions per second
✓ Array	15,004 Ops/sec
Map	1,707 Ops/sec
Dictionary	794 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
let c = 0 for (i=0; i<10000; i+=1) { c += arr[i]}
Map
let c = 0 for (let [key, entry] of map) { c += entry}

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

Large dictionary - how worse is it from array with direct reference? And how does Map perform?

Dictionary

Array

Map