regex vs slice

JavaScript performance comparison

Revision 2 of this test case created by WebReflection

Preparation code

<script>
  var toTypeRegExp = function(obj) {
    return ({}).toString.call(obj).match(/\s([a-z|A-Z]+)/)[1];
  }
  
  var regExp = /\s([a-z|A-Z]+)/;
  
  var toTypeCachedRegExp = function(obj) {
    return ({}).toString.call(obj).match(regExp)[1];
  }
  
  
  var toTypeSlice = function(obj) {
    return ({}).toString.call(obj).slice(8, -1);
  }
  
  var toTypeSI = function(obj) {
    var s = ({}).toString.call(obj);
    return s.slice(s.indexOf(" ") + 1, -1);
  };
  
  var noMatchCreated = function (obj) {
      return regExp.test(({}).toString.call(obj)) && RegExp.$1;
  };
</script>
    

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
regex no cache
toTypeRegExp([1,2,3]);
pending…
regex with cache
toTypeCachedRegExp([1,2,3]);
pending…
slice
toTypeSlice([1,2,3]);
pending…
slice + indexOf
toTypeSI([1,2,3]);
pending…
RegExp without match
noMatchCreated([1,2,3]);
pending…

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