Benchmark: FormData conversion: Object.fromEntries vs for loop

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

Object.fromEntries
const formData = new FormData(); formData.append("x", "1"); formData.append("x", "2"); formData.append("x", "3"); formData.append("x", "4"); formData.append("y", "1"); formData.append("z", "1"); const object = Object.fromEntries(formData);
for of loop
const formData = new FormData(); formData.append("x", "1"); formData.append("x", "2"); formData.append("x", "3"); formData.append("x", "4"); formData.append("y", "1"); formData.append("z", "1"); const object = {}; for(const entry of formData){ object[entry[0]] = entry[1]; }
forEach
const formData = new FormData(); formData.append("x", "1"); formData.append("x", "2"); formData.append("x", "3"); formData.append("x", "4"); formData.append("y", "1"); formData.append("z", "1"); const object = {}; formData.forEach((value, key) => object[key] = value);
for of loop + array support
const formData = new FormData(); formData.append("x", "1"); formData.append("x", "2"); formData.append("x", "3"); formData.append("x", "4"); formData.append("y", "1"); formData.append("z", "1"); const object = {}; for(const [key, value] of formData){ if(typeof object[key] !== "undefined"){ if(Array.isArray(object[key])){ object[key].push(value) } else { object[key] = [object[key], value] } } else { object[key] = value; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.fromEntries
for of loop
forEach
for of loop + array support

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser/OS: Chrome 139 on Windows

View result in a separate tab

Test name	Executions per second
Object.fromEntries	393402.5 Ops/sec
for of loop	456587.6 Ops/sec
forEach	306470.8 Ops/sec
for of loop + array support	400368.0 Ops/sec

Related benchmarks:

FormData conversion: Object.fromEntries vs for loop (version: 1)

Comparing performance of: Object.fromEntries vs for of loop vs forEach vs for of loop + array support

Created: 9 months ago by: Guest

Jump to the latest result

Object.fromEntries

for of loop

forEach

for of loop + array support

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A