Array.indexOf vs Object's "in operator

JavaScript performance comparison

Revision 14 of this test case created by zahar

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr = [
     'that',
     'is',
     'some',
     'nice',
     'some',
     'test',
     'here',
  ]
  
  var obj = {
     'that' : null,
     'is' : null,
     'some' : null,
     'nice' : null,
     'test' : null,
     'here' : null
  }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Array - Find first element
if (arr.indexOf('that') !== -1) {
  // found
}
pending…
Object - Find first element
if ('that' in obj) {
  // found
}
pending…
Array - Find last element
if (arr.indexOf('here') !== -1) {
  // found
}
pending…
Object - Find last element
if ('here' in obj) {
  // found
}
pending…
Object - Find first element (typeof)
if (typeof obj['that'] !== "undefined") {
  // found
}
pending…
Object - Find last element (typeof)
if (typeof obj['here'] !== "undefined") {
  // found
}
pending…
Object - Find first element
if (obj['that']) {
  // found
}
pending…
Object - Find last element
if (obj['here']) {
  // found
}
pending…

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Revisions

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