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Compares two arrays and returns the distinct values.
Created: 2005.11.04

//+ Carlos R. L. Rodrigues
//@ http://jsfromhell.com/array/diff [rev. #1]

diff = function(v, c, m){
    var d = [], e = -1, h, i, j, k;
    for(i = c.length, k = v.length; i--;){
        for(j = k; j && (h = c[i] !== v[--j]););
        h && (d[++e] = m ? i : c[i]);
    }
    return d;
};

<script type="text/javascript">
//<![CDATA[

var a = [1,2,4,5,7], b = [1,2,3,9];

document.write(
    "A = ", a, "<br />B = ", b, "<br /><br />",
    "diff(A, B) = ", diff(a, b), "<br />",
    "diff(B, A) = ", diff(b, a)
);

//]]>
</script>

diff(vector: Array, comparator: Array, [useIndex: Boolean = false]): Array

Compares the array with another (comparator) and, returna an array with the values from comparator that doesn't exists on vector.

vector

array that will be checked

comparator

array that will be compared

useIndex

if true, it will be returned an array containing just the index of the comparator's elements, otherwise returns the values

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