Chunk methods

JavaScript performance comparison

Revision 2 of this test case created

Info

See http://stackoverflow.com/questions/10474992/split-a-javascript-string-into-fixed-length-pieces

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var a = "1234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412341234123412"
   
    function A(a) {
      var b = [];
      for (var i = 4; i < a.length; i += 4) { // length 4, for example
        b.push(a.slice(i - 4, i));
      }
      b.push(a.slice(a.length - (4 - a.length % 4))); // last fragment
      return b;
    }
   
    function match(a) {
      return a.match(/[\s\S]{1,4}/g);
    }
   
    function C(a) {
      var size = 4
      return [].concat.apply([], a.split('').map(function(x, i) {
        return i % size ? [] : a.slice(i, i + size)
      }, a));
    }
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Splice, slice
var chunks = A(a);
pending…
Regex: match
var chunks = match(a);
pending…
Array concat
var chunks = C(a);
pending…

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Revisions

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