Expressions

case .. of

The case expression in Hamler is the same as Haskell.

Hamler:

  1. data RGB = Red | Green | Blue
  2. color = Green
  3. case color of
  4.   Red -> "Red"
  5.   Green -> "Green"
  6.   Blue -> "Blue"

case expression in Erlang ends with an end keyword.

Erlang:

  1. Color = green.
  2. case Color of
  3.   red -> "Red";
  4.   green -> "Green";
  5.   blue -> "Blue"
  6. end.

if .. then .. else

Hamler:

  1. -- Every `then` must have a corresponding `else`
  2. max x y = if x > y then x else y

Erlang:

  1. max(X, Y) -> if X > Y -> X; true -> Y end.

let and where bindings

There are no let and where bindings in Erlang

Hamler:

  1. let n = 1 + 2
  3. z = let x = 3
  4.         y = 2 * x
  5.     in  x * y
  7. -- or
  8. z = x * y
  9.     where
  10.       x = 3
  11.       y = 5