regex vs slice

JavaScript performance comparison

Test case created

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);
  }
  
</script>

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Testing in unknown unknown
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…

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