Status: Untriaged
Owner: ----
New issue 4384 by [email protected]: String.prototype.startsWith is slow
https://code.google.com/p/v8/issues/detail?id=4384
Version: 3.31.74.1
OS: Ubuntu 14.04, Mac OS X 10.10.8
Architecture: x64
String.prototype.startsWith was introduced at 0627d43 as harmony flagged
feature, and unflagged at af04fdf. Its implementation uses indexOf, and it
didn't changed since 0627d43.
So I assume it happens every version after string harmony feature was
introduced, including latest version, and every OS and every architecture.
This is simple startsWith benchmark code, which uses Node.js/io.js
and 'benchmark' package from npm, and results from my machines:
https://gist.github.com/Snack-X/1e14bad01071dbf9ba1b
Included results are from OS X and Ubuntu, and it shows
String.prototype.startsWith is slower than other methods, for example
substring and slice. Especially, it is hundreds times slower than substring
and slice when string becomes very long.
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