Benchmark: Native slice vs copy

Script Preparation code:

function copy (a) {
  const l = a.length
  const b = new Array(l)
  for (let i = 0; i < l; ++i) {
    b[i] = a[i]
  }
  return b
}

function copyNative (a) {
  return a.slice(0)
}

Tests:

Native
var arr = Array(100).fill('hello') var res = copyNative(arr)
For Loop
var arr = Array(100).fill('hello') var res = copy(arr)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Native
For Loop

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 14 on iOS 14.2

View result in a separate tab

Test name	Executions per second
Native	1171730.0 Ops/sec
For Loop	936005.8 Ops/sec

Native slice vs copy (version: 0)

Array#slice vs for loop with array preallocation

Comparing performance of: Native vs For Loop

Created: 6 years ago by: Guest

Jump to the latest result

Native

For Loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A