Run results for: Dict vs. Map vs. Array

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36

Browser: Chrome 72

Operating system: Windows 7

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Dictionary	64873.6 Ops/sec
Array	153753.9 Ops/sec
Map	65825.4 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 (i=2000; i<10000; i+=115) { c += dict['abc_'+i]}
Array
let c = 0 for (i=2000; i<10000; i+=115) { c += arr[i]}
Map
let c = 0 for (i=2000; i<10000; i+=115) { c += map.get('abc_'+i)}

Run results for: Dict vs. Map vs. Array

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

Dictionary

Array

Map