How do I return distinct values and their counts in an array?

I've got to write a function that returns distinct values in an array and their counts. So if my list of values is  is "1 3 5 3 7 3 1 1 5", then I need to return: "1(3) 3(3) 5(2) 7(1)"

brucegustPHP DeveloperAsked:
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Test page :

var occurence = function(str,separator) {
    if(!separator) {
        separator = " ";
    var arr = str.split(separator);
    var obj = {};
    for(var i=0;i<arr.length;i++) {
        var k = "" + arr[i];
        if(typeof obj[k] == "undefined") {
            obj[k] = 1;
        else {
    s = [];
    for(var j in obj) {
        s.push(j + "(" + obj[j] + ")");
    return s.join(separator);

var input = "1 3 5 3 7 3 1 1 5";
var output = occurence( input );

alert( output );

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Ioannis ParaskevopoulosCommented:
May i suggest using linq.js? This is a nice library for dealing with arrays etc.:

here is a sample code:
    var list = [1, 3, 5, 3, 7, 3, 1, 1, 5];
    var result = Enumerable.From(list)
            return x
            return {

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You may also check out this fiddle.

brucegustPHP DeveloperAuthor Commented:
Had to go with pure JS and this worked!

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