Slice vs Substr vs Substring vs [ ] Methods

JavaScript performance comparison

Revision 38 of this test case created

Info

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

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var longString = "",
        word = "",
        length,
        offset,
        start,
        end,
        i;
   
    for (i = 0; i < 10000; i++) {
        longString += i % 10;
    }
   
    length = longString.length;
    start = offset = Math.floor(length / 4);
    end = length - offset;
   
    length = end - start;
};
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

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

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

0 comments

Add a comment