Okay but the whole article could have been summed up in 4 sentences:

> Looking at the specification of parseInt you should notice that it is defined as accepting two arguments. The first argument is the string to be parsed and the second specifics the radix of the number to be parsed. >...the function that is passed as the first argument to map as the callbackfn. The specification says, “the callbackfn is called with three arguments: the value of the element, the index of the element, and the object that is being traversed.”