Benchmark: Array vs Generator comprehension

Script Preparation code:

var map = new Map()
for (let i = 0; i < 500; i++) {
  map.set(i.toString()+"_", i)
}

function* transform(input) {
  for (const [k,v] of input) {
    yield [k+"_2", v]
  }
}

function mapFn([k, v]) {
  return [k+"_2", v]
}

Tests:

Generator
const newMap = new Map(transform(map))
Array
const newMap = new Map([...map].map(mapFn))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Generator
Array

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

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

User agent: Mozilla/5.0 (Android 10; Mobile; rv:109.0) Gecko/112.0 Firefox/112.0

Browser/OS: Firefox Mobile 112 on Android

View result in a separate tab

Test name	Executions per second
Generator	4411.4 Ops/sec
Array	8087.5 Ops/sec

Array vs Generator comprehension (version: 0)

Comparing performance of: Generator vs Array

Created: 2 years ago by: Guest

Jump to the latest result

Generator

Array

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A