Benchmark: flatten arrays 1124124323

Script Preparation code:

var entries = 1000;
var a = [];
var b = [];
var c = [];
var d = [];
var e = [];
var f = [];
for (var i = 0; i < entries; i++) {
  a[i] = Math.random();
  b[i] = Math.random();
  c[i] = Math.random();
  d[i] = Math.random();
  e[i] = Math.random();
  f[i] = Math.random();
}
 var arrayOfArrays = [a, b, c, d, e, f];

Tests:

Array.flat()
var result1 = arrayOfArrays.flat();
Reduce
var result2 = arrayOfArrays.reduce((a, subArray) => a.concat(subArray), []);
forEach
var result3 = []; arrayOfArrays.forEach((subArray) => Array.prototype.push.apply(result3, subArray));
for
var result4 = []; for (var i = 0; i < arrayOfArrays.length; i++) { Array.prototype.push.apply(result4, arrayOfArrays[i]); }
Nested for
var result5 = []; for (var i = 0; i < arrayOfArrays.length; i++) { for (var j = 0; j < arrayOfArrays[i].length; j++) { result5.push(arrayOfArrays[i][j]); } }
Destructuring + reduce
var result6 = arrayOfArrays.reduce((a, subArray) => {a.push(...subArray); return a;}, []);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.flat()
Reduce
forEach
for
Nested for
Destructuring + reduce

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: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Browser/OS: Chrome 74 on Linux

View result in a separate tab

Test name	Executions per second
Array.flat()	796.1 Ops/sec
Reduce	38321.8 Ops/sec
forEach	16011.0 Ops/sec
for	15994.6 Ops/sec
Nested for	919.7 Ops/sec
Destructuring + reduce	3602.1 Ops/sec

flatten arrays 1124124323 (version: 0)

Comparing performance of: Array.flat() vs Reduce vs forEach vs for vs Nested for vs Destructuring + reduce

Created: 4 years ago by: Guest

Jump to the latest result

Array.flat()

Reduce

forEach

for

Nested for

Destructuring + reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A