kevintah / coinchanger Goto Github PK

One issue that came when trying to debug the code is that each function calls modifies the state of the entire application. Meaning, if you call the functions in a different order, you get completely different values.

One recommendation is to have each function only modify local variables and return a value instead. Ex:

// Instead of this
var sum = 0;
function addNumber(num) {
    sum += num;
}

// let's use this

function addNumbers(a, b) {
    return a + b;
}
var sum = addNumbers(1, 2);

I hope this is helpful.