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Faster javascript string replace

Monkey Forums/Monkey Programming/Faster javascript string replace

Perturbatio(Posted 2011) [#1]
Hello, I've been playing around with the string replace function in an attempt to speed it up, I've found much faster ways (especially on larger datasets like the source of a webpage).

The following is a test (HTML page) for three methods (Monkey's, regex and a string split/join combo).


I get good results for all three browsers for the two new functions, split/join seems to be best for FF and Chrome:

My results:
5000 iterations (small data)

IE9:
Monkey: 24
regex: 4
Split/Join: 10


Chrome:
Monkey: 32
regex: 15

Split/Join: 9

FF4:
Monkey: 23
regex: 22
Split/Join: 10


500 iterations, large data

IE9:
Monkey: 6210
regex: 13
Split/Join: 28


Chrome:
Monkey: 1718

regex: 27

Split/Join: 23

FF4:
Monkey: 19903
regex: 28
Split/Join: 25


I realise that this isn't a real-world usage example, but I can see situations where you might for instance want to scrape data from an XML or RSS feed, and string replacements may well be necessary.


marksibly(Posted 2011) [#2]
Hi,

The problem with the regex one is when there are regex chars in the find string - I was a bit wary about the overhead of having to 'escape' the find string.

But I think the split/join version is genius!


Perturbatio(Posted 2011) [#3]
I hadn't considered the possibility of regex chars in the find string. In which case, split/join wins. :)