Swapping characters in a string

Questions / Help
1

I am trying to swap the order of a string but haven’t had much luck getting it to work.

Input:
7F66E4C95D6020B1F32A9B55F383D9E7

Desired Output:
f7664e9cd506021b3fa2b9553f389d7e

2

Hello and welcome…

s = "7F66E4C95D6020B1F32A9B55F383D9E7"

s 
|> String.downcase()
|> String.graphemes()
|> Enum.chunk_every(2) 
|> Enum.reduce(<<>>, fn [x, y], acc -> acc <> y <> x end)

"f7664e9cd506021b3fa2b9553f389d7e"
3 Likes
3

Brilliant. Thank you!

4

Other options:

A simple for:

for << <<a, b>> <- s >>, into: "" do
  <<b, a>>
end

or via regex:

String.replace(s, ~r/(\w)(\w)/, "\\2\\1")
5 Likes