CSC302 2011S, Class 13: Scala (2)

Overview:
* Lab.

Admin:
* Welcome to any alums who may be visiting!
* Assignment 5 released.
* Sorry for being behind in stuff.  Grading 30 exams was disruptive.
* EC for Thursday extra: Walker.
* EC for Friday CS Table: GPUs.

Lab Questions

Ooh ... it's weirdly sweet
> sump((1,2))
Int 3
> sump(1,2)
Int 3

Or is it sour?
> pair(1,2)
((1,2), (1,2))

Function types:
  Int=>Int, a function from ints to ints

E.g.
  def applyto1(f: Int=>Int): Int = f(1)

compose(f,g)(x) == f(g(x))
  Or "f o g" in many calculus textbooks

def compose[In,Mid,Out](f: Mid=>Out, g: In=>Mid) = { x: In => f(g(x)) }

def x: Map[Any,Any] = Map()