calc.js

var calc = (function () {

    function parse (str) {
        return str.split(",")
    }

    function replace (str) {
        return str.replace(";", ",")
    }

    function replaceRegEx (str) {
        var re = /[,;\n]/g
        return str.replace(re, ",")
    }

    return {
        parse: parse,
        replace: replace,
        replaceRegEx: replaceRegEx
    }
}())

if (str == "") {
    return 0
}
else {
    return parseInt(str)
}

var nums = ["1", "2", "3"];
var sum = 0;



throw new Error("foo")

for (var i = 0; i < nums.length; i++) {
    sum = sum + parseInt(num[i]);
}

this is cool