[Solved] dynamically creating an associative array

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This should do the trick: 

var hash_a = {'foo': 'bar'};
var hash_b = {'alha': 'beta'};
var array = ['a', 'b', 'c'];

function build(a,b,c){
    var o=c.reduceRight(function(o, n){ var b={}; b[n]=o; return b; }, b);
    for(x in a){ o[x]=a[x]; }
    return o;
}

Here is the fiddle to play with.
See MDN for further explanation of Array.prototype.reduceRight().

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solved dynamically creating an associative array