Slice vs Substr vs Substring Methods

JavaScript performance comparison

Test case created by Kon P and last updated

Info

This is comparing the runtimes of substr, substring, and slice in a string for large (10000 character) string size.

Preparation code

<script type="text/javascript">
  var longString = "";
  // Large = 10,000
  for (var i = 0; i < 10000; i++) {
        longString += i % 10;
  }
</script>

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Testing in unknown unknown
Test Ops/sec
Substring (long)
for (i = 0; i < longString.length; i++) {
  longString.substring(i, i + 1);
}
pending…
Slice (long)
for (i = 0; i < longString.length; i++) {
  longString.slice(i, i + 1);
}
pending…
Substr (long)
for (i = 0; i < longString.length; i++) {
  longString.substr(i, 1);
}
pending…

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1 comment

Kon P (revision owner) commented :

  • Note -

Chrome 4.1.249 = xScope Pro 6.43.1 (Android 2.3) Android 2.3.7 = Default Android Browser Fennex 10.0 = Firefox Beta (Android 2.3)

Android device used is a Nexus S 4G

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