[Solved] Inserting and removing a character from a string

by


Adding characters

"customer" <> "s"

Removing characters

Elixir idiomatic:

String.trim_trailing("users", "s")
#⇒ "user"

More efficient for long strings:

with [_ | tail] <- "users" |> to_charlist |> :lists.reverse,
  do: tail |> :lists.reverse |> to_string

Most efficient (credits to @Dogbert):

str = "users"
sz = :erlang.byte_size(str),       
:erlang.binary_part(str, {0, sz - 1})

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solved Inserting and removing a character from a string