Last active
March 16, 2017 19:33
-
-
Save mcelaney/ed48f15083dc2c2272e292a1942c43be to your computer and use it in GitHub Desktop.
PhillyDev Slack #DailyProgrammer March 16, 2017
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
defmodule Sorter do | |
@doc """ | |
Takes a list and prints the list with the non zero index position before it was sorted. | |
## Example | |
iex> Sorter.sortit([34, 7, 38, 1]) | |
"1 was in position 3" | |
"7 was in position 1" | |
"34 was in position 0" | |
"38 was in position 2" | |
:ok | |
""" | |
@spec sortit(list(pos_integer)) :: list(String.t) | |
def sortit(values) do | |
values | |
|> Enum.with_index | |
|> Enum.map(fn({value, key}) -> {value, "#{value} was in position #{key + 1}"} end) | |
|> Enum.sort_by(fn({value, _}) -> value end) | |
|> Enum.each(fn({_, message}) -> IO.inspect message end) | |
end | |
end | |
defmodule FasterSorter do | |
@doc """ | |
Takes a list and prints the list with the non zero index position before it was sorted. | |
## Example | |
iex> Sorter.sortit([34, 7, 38, 1]) | |
"1 was in position 3" | |
"7 was in position 1" | |
"34 was in position 0" | |
"38 was in position 2" | |
:ok | |
""" | |
@spec sortit(list(pos_integer)) :: list(String.t) | |
def sortit(values, position \\ 1) do | |
values | |
|> sortit(%{}, 1) | |
|> Enum.each(fn({_, value}) -> IO.inspect(value) end) | |
end | |
def sortit([], acc, _), do: acc | |
def sortit([head|tail], acc, position) do | |
sortit( | |
tail, | |
Map.put(acc, head, "#{head} was in position #{position}"), | |
position + 1 | |
) | |
end | |
end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment