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Typically when you want to extract a single value from such an array, you use reduce.

airpair.com/javascript/javascript-array-reduce

So you can do this instead:

var totalArray = [2,2,2];
var sum=0;

var foo = totalArray.reduce(function(total, num){ 
    return total + num 
}, sum);  

console.log(foo);

// 6