Find 2 numbers in an unsorted array equal to a given sum

Question

We need to find pair of numbers in an array whose sum is equal to a given value.

A = {6,4,5,7,9,1,2}

Sum = 10 Then the pairs are - {6,4} ,

Answer 1

The following code returns true if two integers in an array match a compared integer.

 function compareArraySums(array, compare){

        var candidates = [];

        function compareAdditions(element, index, array){
            if(element <= y){
                candidates.push(element);
            }
        }

        array.forEach(compareAdditions);

        for(var i = 0; i < candidates.length; i++){
            for(var j = 0; j < candidates.length; j++){
                if (i + j === y){
                    return true;
                }
            }
        }
    }