Array Performance

JavaScript performance comparison

Revision 4 of this test case created by hite

Info

Manual array lookups vs. holey arrays.

Preparation code

<script>
  Benchmark.prototype.setup = function() {
var end = 1000,offset = 680;
var a1 = [],a2 = [],o={};
for(var i=0;i<end ;i++){
 a1.push({id:i,name:"name1"});
 a2[i]={id:i,name:"name1"};
 o[""+i]={id:i,name:"name1"};
}
 
  };
</script>

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Testing in unknown unknown
Test Ops/sec
Manual Array Lookup
var id = offset ;
for (var i = 0; i < a1.length; i++) {
  if (a1[i].id === id) {
    result = a1[i];
    break;
  }
}
 
pending…
Holey Array by Index
var id = offset ;
var result = a2[id];
pending…
Object by Key
var id = ''+offset ;
var result = o[id];
 
pending…
Object by Indexed Key
var id = offset ;
var result = o[id];
 
pending…

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