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 small (100 character) string size.

Preparation code

<script type="text/javascript">
  var smallString = "";
  // Small = 100
  for (var i = 0; i < 100; i++) {
    smallString += i % 10;
  }
</script>

Test runner

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

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