Elixir Case Cond If

Case allows us to compare the values of many patterns until we find a matching

--don't think of switch case

IEX ($) > x = 1
1
IEX ($) > Case Ten Do
... (+) > x, "1000"
... (200) > _
... (+) > End
"1000"

To pattern-match an existing variable, you need the ^ operator
IEX > x = 1
1
IEX ($) > Case Ten Do
... (^x) > "1000"
... (200) > _
... (a) > End
"200"

Cond find out the first one for real.

Similar to switch case or else if

IEX (+) > Cond do
... (+) > + 5 "11111"
... (+) > + = 2 "222"
... (+) > End
"222"

If and unless

iex> if true do...>   "This works!"...> end"This works!"
iex> unless true do...>   "This will never be seen"...> endnil

if --else

iex> if nil do...>   "This won‘t be seen"...> else...>   "This will"...> end"This will"

Elixir Case Cond If