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Run results for: Comparing array.concat.apply short form with empty array vs array.flat vs array.reduce

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Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 15_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Mobile/15E148 Safari/604.1
Mobile Safari 15
iOS 15.4.1
Mobile
2 years ago
Test name Executions per second
array.apply 201445.0 Ops/sec
array.flat() 25738.5 Ops/sec
array.reduce 10768165.0 Ops/sec
Script Preparation code:
​x
 
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));
​
var allArrays = [array1, array2, array3, array4, array5];
Tests:

  • array.apply

     
    var others = [].concat.apply([], allArrays);

  • array.flat()

     
    var others = allArrays.flat()

  • array.reduce

     
    var others = allArrays.reduce(((combinedLength, label) => combinedLength + label.length), 0)