FCC IAS #3 - Bonfire: Pairwise

function pairwise(arr, arg) {
    var newArg = 0;

    for(x=0; x<arr.length ; x++) {
       var a = arr[x];
        if(x+1 === arr.length) {
            break;
        } else {
            for(y=x+1; y<arr.length; y++) {
               var b = arr[y];
               if(a+b === arg) {
                   newArg += (x+y);
                   arr[x]=''; a='';
                   arr[y]=''; b=''; 
               }
           }
        }
    }
    
    return newArg;
}

console.log(pairwise([1,4,2,3,0,5], 7)); console.log("is " + 11);
console.log(pairwise([1, 3, 2, 4], 4)); console.log("is " + 1);
console.log(pairwise([1,1,1], 2)); console.log("is " + 1);
console.log(pairwise([0, 0, 0, 0, 1, 1],1)); console.log("is " + 10);
console.log(pairwise([], 100));console.log("is " + 0);