indexOf vs substring
JavaScript performance comparison
Test case created by Shane O'Sullivan
Info
tests whether it is faster to check indexOf at the end of a string rather than getting the substring
Preparation code
<script>
var str = "abcdefghijklmnopqrstuvwxyz.css";
var str2 = "ab";
var str3 = ".cssojdvjsdscscd"
var needle1 = ".css";
var needle2 = "qwertyuiopasdfghjklzxcvbnm";
</script>
Test runner
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Testing in unknown unknown
| Test |
Ops/sec |
indexOf |
str.indexOf(needle1) == str.length - needle1.length;
str2.indexOf(needle1) == str2.length - needle1.length;
str3.indexOf(needle1) == str3.length - needle1.length;
str.indexOf(needle2) == str.length - needle2.length;
str2.indexOf(needle2) == str2.length - needle2.length;
str3.indexOf(needle2) == str3.length - needle2.length;
|
pending… |
substring |
str.substring(str.length - needle1.length) === needle1;
str2.substring(str2.length - needle1.length) === needle1;
str3.substring(str3.length - needle1.length) === needle1;
str.substring(str.length - needle2.length) === needle2;
str2.substring(str2.length - needle2.length) === needle2;
str3.substring(str3.length - needle2.length) === needle2;
|
pending… |
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