Sum function in javascript which handles nan and decimal points correctly

sum-javascript

function sum(){
    var args = Array.prototype.slice.call(arguments);
    var total = 0;
    var highestDecimalPoints = 0;
    var sanitizedArray = [];

    args.forEach(function(no){
        if(!isNaN(no)){
            //If no is decimal
            if(no % 1 > 0){
                var noStr = no.toString();
                var decimalPoints = noStr.length - 1 - noStr.indexOf('.');
                highestDecimalPoints = decimalPoints > highestDecimalPoints ? decimalPoints : highestDecimalPoints;
            }
            sanitizedArray.push(no)
        }
    });

    var multiplier = 1;
    for(var i=0; i < highestDecimalPoints; i++){
        multiplier = multiplier * 10;
    }

    for(var index in sanitizedArray){
        total += sanitizedArray[index] * multiplier; 
    }

    total = total / multiplier;
    return total;
}