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Thread: How do I sort an array of Strings, ignoring "THE", "A", and "AN" from the beginning?

  1. #1
    Join Date
    Sep 2005
    Posts
    106

    Question How do I sort an array of Strings, ignoring "THE", "A", and "AN" from the beginning?

    Basically I want to sort an array of Strings like iTunes sorts its titles. This means ignoring certain words that are at the beginning of the title.

    Here's what I have so far, and it seems to sorta work, but not properly, and not at all properly in IE. And btw, I'm using Prototype, so that explains the .startsWith function:

    Code:
    var ignoreWords = ["A", "AN", "THE"];
    
    function sortTitles(a, b) {
        for (var i = 0; i < ignoreWords.length; i++) {
            if (a.toUpperCase().startsWith(ignoreWords[i] + " ")) {
                a = a.substr(ignoreWords[i].length);
            }
            if (b.toUpperCase().startsWith(ignoreWords[i] + " ")) {
                b = b.substr(ignoreWords[i].length);
            }
        }
        return a > b;
    }
    So, given an array of strings, some of them being like "The Wall", so that they are sorted differently, the function above doesn't work properly. Any ideas?

  2. #2
    Join Date
    Feb 2006
    Posts
    2,927
    Code:
    function sortTitles(a, b){
        var rx= /^ *(a|an|the)\b */;
        a= a.toLowerCase().replace(rx,'');
        b= b.toLowerCase().replace(rx,'');
        if(a== b) return 0;
        return a> b? 1: -1;
    }
    //test
    var A= ['The Slow Dog', 'The Fat Cat','An Army of One',
    'An Angry Dog','A Car Chase'];

    alert(A.sort(sortTitles));

  3. #3
    Join Date
    Sep 2005
    Posts
    106
    mrhoo, that works PERFECTLY! Thanks a million! I'll credit you in the comments for the function

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