Using the pipe operator with functions, but no arguments

Question

Elixir lets me write this:

"Elixir rocks" |> String.upcase() |> String.split()

And I can introduce a function to combine the upcasing and the split:

upcase_split = fn (data) -> data |> String.upcase() |> String.split() end
"Elixir rocks" |> upcase_split()

Or

upcase_split_shorter = &(&1 |> String.upcase() |> String.split())
"Elixir rocks" |> upcase_split_shorter()

Is there a way to do this point-free? That is, without having to give a name to that first argument that I need to pass through the whole way?

This doesn't work:

nope = String.upcase() |> String.split()

but I was hoping there was something along those lines that might?

Sheharyar · Accepted Answer · 2019-01-18 01:02:50Z

2

Anonymous functions are called differently than regular module functions. It's better to define your function in a module and call it from there but if you insist on using an anonymous function, you have to use the dot to call it. Like fun.():

"Elixir rocks" |> (&(&1 |> String.upcase() |> String.split())).()

or simply:

upcase_split_shorter = &(&1 |> String.upcase() |> String.split())
"Elixir rocks" |> upcase_split_shorter.()

While Elixir doesn't officially support currying, you can take a look at some packages and other resources that implement it:

Package: Quark
Package: Elixir-Currying
Package: Kare
Forum Discussion: Currying in Elixir
Blog Post: Create Currying Functions in Elixir
Blog Post: Function Currying in Elixir

answered Jan 18, 2019 at 1:02

Sheharyar

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