Pipelines¶

Pipelines (|>) are an alternative syntax for function application:

Example

"Hello there"
|> String.split(" ")
|> List.length
|> #(_ + 1)

// is the same as:

List.length(String.split(" ", "Hello there")) + 1

The general form is:

value |> function // ==
function(value)

value |> function(initial, arguments) // ==
function(initial, arguments, value)

|> is left-associative:

x |> f1 |> f2    // =
(x |> f1) |> f2  // =
f1(x) |> f2      // =
f2(f1(x))

In case you want to provide an argument to a function on a different position than the last, use the hole shorthand:

userInput
|> parseValue
|> #(Dict.member(_, allowedValues)) // pass as a first argument