I'm able to take advantage of the TypeScript datatyping support to specify a datatype for my cust parameter (it's expecting a Customer object) and what my function will return (in this case, a string) ...

In TypeScript, you can define a function that, when passed a set of parameters, creates and returns a correctly configured object. One of the parameters passed to the function must be the class of the ...

Like TypeScript, CoffeeScript is a superset ... It allows you to use square brackets like function arguments on an array, and the arguments are passed to slice() as you’d expect.