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• javascript for/in (Score:1)

  by rjbs (4671) on 2005.02.01 9:46 (#37928) Homepage Journal

  The irritating thing, to me, is that it does (sort of) do the right thing for Arrays, but not Array-alikes.
  
  For an array, for/in iterates over indices. Weird, but fine. It's a fair shorthand for a three-part for. The problem is with Array-like objects like, say, nodeList. A node list is supposed to act just like an Array, but for/in will iterate over a nodeList's attributes, not its elements. Argh! JS needs real iterators.

  --
  rjbs

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  • Re:javascript for/in (Score:1)

    by osfameron (3135)

    Using a ruby-like for method could be the way forward?

    Array.prototype.foreach = function(fn) {
      var l = this.length;
      for (var i=0; i<l; i++) {
        fn(this[i])
      }
    }
    
    var arr=[1,2,3,4,5];
    
    arr.foreach(function(v) {
      print( v, ' squared is ', v*v, "\n")
    });

    You could give nodeList'd prototype a different method which does the right thing there. (Not that I've tested - actually, if nodeList is a native code object then adding a javascript prototype method might not do anything at

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    osfameron