JS startsWith

JavaScript performance comparison

Revision 15 of this test case created

Info

Perf-testing a JS startsWith() function

Preparation code

<script>
  // sample data
  var origString = 'hello, world';
  var testString = 'he';
</script>

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Testing in unknown unknown
Test Ops/sec
indexOf === 0
origString.indexOf(testString) === 0
pending…
!indexOf
!origString.indexOf(testString)
pending…
substr
origString.substr(0, testString.length) === testString
pending…
lastIndex
origString.lastIndexOf(testString, 0) === 0
pending…

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