Run results for: reflection vs map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Browser: Chrome 105

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
map	54517.7 Ops/sec
reflection	14826.8 Ops/sec

Script Preparation code:

var map = new Map();
var x = {};
for(let i = 0; i< 1000; i++){
    map.set(i.toString(), i);
    x[i.toString()] = i;
}

AخA
 
var map = new Map();var x = {};for(let i = 0; i< 1000; i++){    map.set(i.toString(), i);    x[i.toString()] = i;}

Tests:

Array.from(map.entries()).filter(ent => ent[1]%2 == 0);

 
Array.from(map.entries()).filter(ent => ent[1]%2 == 0);

reflection
const keys = Object.keys(x); keys.filter(key => x[key]%2==0);
const keys = Object.keys(x);
keys.filter(key => x[key]%2==0);