Slice vs Substr vs Substring vs [ ] Methods

JavaScript performance comparison

Revision 52 of this test case created

Info

This is comparing the runtimes of [ ], substr, substring, and slice in a string for large (66000 character) string size.

Preparation code

<script type="text/javascript">
  var longString = "";
  // Large = 66,000
  for (var i = 0; i < 66000; i++) {
    longString += i % 10;
  }
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Substring (long)
longString.substring(0, 1);
pending…
Slice (long)
longString.slice(0, 1);
pending…
Substr (long)
longString.substr(0, 1);
pending…
[ ] (long)
longString[0];
pending…
charAt (long)
longString.charAt(0);
pending…

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