filter versus dictionary

JavaScript performance comparison

Revision 4 of this test case created by Joshua Choinsky

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var array = [{
      "name": "Joe",
      "age": 17
    }, {
      "name": "Bob",
      "age": 17
    }, {
      "name": "Carl",
      "age": 35
    }];
};
</script>

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Testing in unknown unknown
Test Ops/sec
map
var ages = array.map(function(obj) {
  return obj.age;
});
ages = ages.filter(function(v, i) {
  return ages.indexOf(v) == i;
});
pending…
dictionary
var unique = {};
var distinct = [];
for (var i in array) {
  if (typeof(unique[array[i].age]) == "undefined") {
    distinct.push(array[i].age);
  }
  unique[array[i].age] = 0;
}
pending…
dictionary ===
var unique = {};
var distinct = [];
for (var i in array) {
  if (typeof(unique[array[i].age]) === "undefined") {
    distinct.push(array[i].age);
  }
  unique[array[i].age] = 0;
}
pending…
dictionary {} change
var unique = {};
var distinct = [];
for (var i in array) {
  if (typeof(unique[array[i].age]) === "undefined") {
    distinct.push(array[i].age);
    unique[array[i].age] = 0;
  }
}
pending…

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