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Run results for: 2dArray[a][b] vs getValue(obj, a, b);

Conditional 2D Array index-swapped get performance test.

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.229 Whale/2.10.123.42 Safari/537.36
Chrome 90
Windows
Desktop
3 years ago
Test name Executions per second
Normal access 2431450.8 Ops/sec
Conditional index-swapped access 1713081.9 Ops/sec
Script Preparation code:
​x
 
arr = new Array(100).fill(null).map((_, i) => new Array(100).fill(null).map((_, j) => i + "," + j));
​
objA = {};
objB = {};
objs = [objA, objB];
​
randomValues = new Array(10000).fill(null).map(() => [Math.floor(Math.random()*100), Math.floor(Math.random()*100), objs[Math.floor(Math.random()*2)]]);
​
function getValue(obj, a , b) {
  if(obj === objA)
    return arr[a][b];
  else
    return arr[b][a];
}
Tests:

  • Normal access

     
    const [a, b] = randomValues[Math.floor(Math.random()*10000)];
    arr[a][b];

  • Conditional index-swapped access

     
    const [a, b, obj] = randomValues[Math.floor(Math.random()*10000)];
    getValue(obj, a, b);