# Writing anonymous functions in Elixir
# this shows writing and use of anon funcs
# gtowell
# July 18, 2022

# NOTE
# IO is the name of a package
#    puts is the name of a function in the IO package
#    "puts" --> PUT String

# Anon func with no args
#   Can put () before the -> but it is not required
a = fn -> 7 end
# Call to anon fun. Note the "." after the variable name
# Also note that IO.puts is a function. Can wrap the arg in ()
# but that is optional
# general consensus is to use the parens
IO.puts a.()
IO.puts(a.())

# Anon func with one arg
b = fn (x) -> 7*x end
IO.puts b.(7)

#Anon fun with 2 args
# Note the ; to separate expressions
# CR-LF can also separate expressions
c = fn (x,y) -> z=x+2; z*y end
IO.puts c.(3,4)
cc = fun(x,y) ->
  z=x+2
  z*y
end

# Anon fun with three args and it is written on multiple lines
d = fn (x,y,z) ->
  zz = z+3
  x*y*zz
end
IO.puts d.(2,3,4)