Kata

JavaScript provides a built-in parseInt method.

It can be used like this:

• "10" returns 10
• "10 apples" also returns 10

We would like it to return "NaN" (as a string) for the second case because the input string is not a valid number.

You are asked to write a function with the following rules:

• It should make the conversion if the given string only contains a single integer value (and possibly spaces - including tabs, line feeds... - at both ends)
• For all other strings (including the ones representing float values), it should return NaN
• It should assume that all numbers are not signed and written in base 10