Convert a float to a string with two decimal digits. (Erlang)
:erlang.float_to_list(7.12, [{:decimals, 4}, :compact])
Get the value of an operating-system environment variable. (Elixir)
System.get_env("PATH")
Return the extension component of a file name (so return .exs if given
"dave/test.exs"). (Elixir)
Path.extname("~/code/elixir/programming-elixir/factorial.exs")
Return the process's current working directory. (Elixir)
System.cwd
Convert a string containing JSON into Elixir data structures. (Just find; don't install.) https://github.com/devinus/poison https://github.com/cblage/elixir-json etc.
Execute a command in your operating system's shell.
System.cmd("ls", ["-hal"]) |> elem(0) |> String.split("\n")