Run results for: Dict vs. Map vs. Array ( complete iteration 4)

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

Test name	Executions per second
Dictionary	156.4 Ops/sec
Array	13057.2 Ops/sec
Map	626.6 Ops/sec
Array Iterator	28208.7 Ops/sec
Array Inverse While	11366.2 Ops/sec
Array ++i	13293.5 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 const l = arr.length; for (let i=0; i<l; i+=1) { c += arr[i]}
Map
let c = 0 for (let [key, entry] of map) { c += map.get(key)}
Array Iterator
let c = 0 for (let entry of arr) { c += entry}
Array Inverse While
let c = 0 let i = arr.length; while(i--){ c += arr[i]; }
Array ++i
let c = 0 const l = arr.length; for (let i=0; i<l; ++i) { c += arr[i]}

Run results for: Dict vs. Map vs. Array ( complete iteration 4)

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

Dictionary

Array

Map

Array Iterator

Array Inverse While

Array ++i