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Run results for: Array.concat vs Array.prototype.concat.apply

Compare direct concat call with apply for multiple arrays concatenation

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Chrome 121
Windows
Desktop
one year ago
Test name Executions per second
Array.concat 1637340.5 Ops/sec
Array.prototype.concat.apply 1407759.0 Ops/sec
Array.prototype.concat.apply short form 1560825.8 Ops/sec
Array.prototype.concat.apply short form without new empty array instance in apply 1203360.2 Ops/sec
Array.prototype.concat.apply short form without new empty array at all 1205535.2 Ops/sec
Script Preparation code:
AخA
 
var array1 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array2 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array3 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array4 = Array(400).fill().map(() => Math.round(Math.random() * 40));
var array5 = Array(400).fill().map(() => Math.round(Math.random() * 40));
Tests:

  • Array.concat

     
    var others = array1.concat(array2, array3, array4, array5);

  • Array.prototype.concat.apply

     
    var others = Array.prototype.concat.apply([], [array1, array2, array3, array4, array5]);

  • Array.prototype.concat.apply short form

     
    var others = [].concat.apply([], [array1, array2, array3, array4, array5]);

  • Array.prototype.concat.apply short form without new empty array instance in apply

     
    var others = [].concat.apply(array1, [array2, array3, array4, array5]);

  • Array.prototype.concat.apply short form without new empty array at all

     
    var others = array1.concat.apply(array1, [array2, array3, array4, array5]);