# An example of using pipes in Elixir.
# The pipes do a fairly trivial task, namely capitalizing
# the first letter of every word in a string.
#
# The pipes only appear at the end of this file
# Prior to that is a couple of functions and examples of
# their use.
#
# This version uses only anonymous functions and several
# functions in the Enum library
#
# author gtowell
# Created: July 19, 2022


# First a function to capitalize the first letter of a string
# This takes a string as an argument and returns a string
# with the first letter capitalized
up_first = fn (str) -> String.upcase(String.slice(str, 0..0))<> String.slice(str, 1..-1) end

# example
IO.puts up_first.("this")

# Capitalize the each word in a list of words
cap_list = fn (wlist) -> Enum.map(wlist, fn (w) -> up_first.(w) end) end

# examples
IO.inspect cap_list.(["a", "test"])
IO.inspect cap_list.(String.split("this is a test"))

# Putting everything together without using pipes
IO.inspect Enum.join(cap_list.(String.split("this is a test")), "_")

# Now do it using pipes
# The results is alost always far easier to read.
IO.inspect String.split("this is a test")
            |> cap_list.()
            |> Enum.join("_")