Object array add values

Can someone help me with this javascript?
It's supposed to remove duplicates from an object array and add the values left.

IsaacSharePoint Client Side DeveloperAsked:
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The function needs to be defined before you try to use it.
All I did was move lines 3-5 down below the function definition.

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IsaacSharePoint Client Side DeveloperAuthor Commented:
I feel stupid...Thanks!
RobOwner (Aidellio)Commented:
For future reference, this is the working code

var foo = [ { "a" : 15 }, { "b" : 25 }, { "a" : 15 }, {"c" : 13} ];

var uniqBy = function(ary, key) {
    var seen = {};
    return ary.filter(function(elem) {
        var k = key(elem);
        return (seen[k] === 1) ? 0 : seen[k] = 1;

uniqs = uniqBy(foo, JSON.stringify);
values = uniqs.map(function(x) { for(var k in x) return x[k] });
sum = values.reduce(function(a, b) { return a + b });


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