Learning Functional Programming in Go

How the Y-Combinator works

The diagram below illustrates how the Y-Combinator works:

The following are the steps to wire up the Y-Combinator:

1. f(newData) calls Base64ToByes with the base64 encoded text. dString is downcast into a string.

2. The return func(e error) (Data, error) { statement is executed and returns execution back to the return statement in the Next function. 

3. At that time, f(newData), which itself is a function, has its newError parameter populated and can now be executed. 

4. Runtime execution returns to the return func(e error) (Data, error) line in Base64ToBytes and enters its code block, which is the return statement that ...