Understanding Currying in Scala

Question

I\'m getting problems to understand the currying concept, or at least the SCALA currying notation.

wikipedia says that currying is the technique of translating the evalu

Answer 1

Your question interested me so I tried this out my self. They actually desugar down to some very different constructs. Using

def addCurr(a: String)(b: String): String = {a + " " + b}

This actually compiles to

def addCurr(a: String, b: String): String = {a + " " + b}

So it completely removes any currying effect, making it a regular arity-2 method. Eta expansion is used to allow you to curry it.

def add(a:String): String => String = {b => a + " " + b}

This one works as you would expect, compiling to a method that returns a Function1[String,String]