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Thread: Array .sort(), special case...

  1. #1
    Join Date
    Jul 2010
    Posts
    2

    Array .sort(), special case...

    Hey guys...

    Let's say I have an array of 10 items (known length).
    Each item in the array is another array of 2 items each (also known length).
    So imagine each of the items of the first array looks like this:

    Array1[0]=Array2;

    and

    Array2[0]='a string'
    Array2[1]=number.

    What I am trying to do is sort Array1, descending based on the value of Array2[1].

    Any ideas would be very welcome, thanks in advance...

  2. #2
    Join Date
    Aug 2007
    Posts
    3,767
    This should do the trick.
    Code:
    Array1.sort(function(a,b){return a[1] - b[1];});
    If you want the order reversed, use this instead.
    Code:
    Array1.sort(function(a,b){return b[1] - a[1];});
    Great wit and madness are near allied, and fine a line their bounds divide.

  3. #3
    Join Date
    Jul 2010
    Posts
    2
    Thanks a lot mate, worked just fine! Take care...

  4. #4
    Join Date
    Jul 2008
    Location
    urbana, il
    Posts
    2,787
    if you/anyone need something re-usable:


    Code:
    function sortSub(strProperty, blnDescending){
     return blnDescending?
        function(a,b){ return a[strProperty]==b[strProperty] ? 0 : (a[strProperty]<b[strProperty]?1:-1);}  :
        function(a,b){ return a[strProperty]==b[strProperty] ? 0 : (a[strProperty]>b[strProperty]?1:-1);} ;
    }


    it can sort an array of objects, including arrays of arrays.


    it builds a sort function, so you pass a call to sortSub, with the property name to be sorted on passed to it, as the argument to a .sort().
    normally, you put a function or reference to a function there, but this builds a function on-demand, and that gets passed to .sort().

    usage:

    function sortSub( string strProperty, boolean blnDescending ) returns function;



    examples:
    Code:
    r=[[2,6],[2,8],[8,2],[1,5],[3,3],[4,1]];
     alert(r.sort(sortSub( 0 )) .join("|")  )
    
    
    r=[{a:1},{a:6},{a:1},{a:4}];
     alert( JSON.stringify( r.sort(sortSub( "a", true )), null,  "\t")  )
    Last edited by rnd me; 07-16-2010 at 02:19 PM.

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