Benchmark: for loop: object vs map

Script Preparation code:

var mapData = [];
for (let i = 0; i < 10000; i++) {
  mapData.push([i, `object${i}`]);
}
var map = new Map(mapData);
                          
var obj = {};
for (let i = 0; i < 10000; i++) {
  obj[i] = `object${i}`;
}

Tests:

for loop of Map
let sum = 0; for (let [key, val] of map) { sum += key; }
for loop of Object
let sum = 0; for (let [key, val] of Object.entries(obj)) { sum += key; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop of Map
for loop of Object

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Windows

View result in a separate tab

Test name	Executions per second
for loop of Map	22922.3 Ops/sec
for loop of Object	2839.3 Ops/sec

for loop: object vs map (version: 0)

Comparing performance of: for loop of Map vs for loop of Object

Created: one year ago by: Guest

Jump to the latest result

for loop of Map

for loop of Object

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A