Comments for gunnarsteinn.com

Comment on Easily cache results from Javascript functions by Gunnar Steinn

Gunnar Steinn — Wed, 23 Sep 2009 22:48:27 +0000

@jetm Thanks, fixed the link

Comment on Easily cache results from Javascript functions by jetm

jetm — Wed, 23 Sep 2009 17:54:30 +0000

URL:
http://www.gunnarsteinn.com/2009/09/easily-cache-results-from-javascript-functions/wp-content/cache.html

Is don’t working

Comment on Easily cache results from Javascript functions by Gunnar Steinn

Gunnar Steinn — Mon, 21 Sep 2009 17:03:09 +0000

Adrians approach works well except that arguments isn’t a proper Array in Javascript so you will have to use the “Array.slice.call(arguments).join(’|')” line from my code.

Comment on Easily cache results from Javascript functions by Bob

Bob — Mon, 21 Sep 2009 16:44:19 +0000

I came up with an alternative version as well, looks like Adrian beat me to it.

My commentary is here:

http://www.reddit.com/r/programming/comments/9mm5o/easily_cache_results_from_javascript_functions/c0deuu8

I put Adrian’s thing in there, to get the formatting back. Woo!

Comment on Easily cache results from Javascript functions by Adrian Quark

Adrian Quark — Mon, 21 Sep 2009 15:46:17 +0000

Sorry about the formatting, the blog software seems to lose indentation even though I used a block.


[EDIT: Fixed   Gunnar Steinn]



Comment on Easily cache results from Javascript functions by Adrian Quark
Adrian Quark — Mon, 21 Sep 2009 15:45:15 +0000
A few problems with this:

1. the .name property is a much easier way to get the name of a function.

2. this won’t work with anonymous functions.

3. because it uses a global cache the cached values won’t be garbage collected even if the function goes away (e.g. it’s an event handler).

4. if your function takes a variable number of arguments and one contains a “|” the cache won’t work correctly.

5. if the function returns null this won’t be cached

6. the cache key won’t work with Object values since they don’t have a unique string representation. You need to use something like http://www.timdown.co.uk/jshashtable/ to get around that.
You can fix 1-5 with some minor modifications:
function memoise(f) {
  var cache = {};
  return function () {
    var key = arguments.length+"|"+arguments.join("|");
    if (cache[key] === undefined) {
      cache[key] = f.apply(this, arguments);
    }
    return cache[key];
  }
}

isPrime = memoise(isPrime);




Comment on Blogg by Gunnar Steinn
Gunnar Steinn — Wed, 16 Sep 2009 10:30:10 +0000
Ef þú skoðar RSS-feedið sérðu meira segja gömlu færslurnar, Wordpress ekki alveg að kunna að fela færslur…
Glæsilegt með armböndin, ég er svo flínkur að prjóna!



Comment on Blogg by katrín
katrín — Tue, 15 Sep 2009 22:37:35 +0000
sjitt ég hélt það væru einhverjar private færslur og ég ekki með aðgang! sá svo að það var ég sem kommentaði á þetta þannig þetta getur ekki hafa verið læst:)
ég er núna að tölvastm eð fínu armböndin mín.. eða úlnliðaskjólin.. eða hvað sem þetta kallst, ó svo fínt:)



Comment on Blogg by Gunnar Steinn
Gunnar Steinn — Tue, 15 Sep 2009 13:58:12 +0000
@gunnare 

Já ég kann ekki að slökkva á þeim. Ég faldi bara gömlu færslurnar og bjóst við að kommentin færu með but computer says no.
Þú verður bara að kommenta 3x í viðbót og vandamálið er leyst!


Comment on Blogg by gunnare
gunnare — Tue, 15 Sep 2009 12:51:24 +0000
Kannast við þetta vandamál.
En hey! Maður sér comment á private færslur í recent comments hjá þér.