Expressions And Operators: Pipe

The binary pipe operator, |>, evaluates the result of a left-hand expression and stores the result in $$, the pre-defined pipe variable. The right-hand expression must contain at least one occurrence of $$.

Basic Usage

With the pipe operator, you can chain function calls, as shown in the code below.

$x = vec[2,1,3]
  |> Vec\map($$, $a ==> $a * $a) // $$ with value vec[2,1,3]
  |> Vec\sort($$); // $$ with value vec[4,1,9]

Written in another way, the code above is syntactically equivalent to:

Vec\sort(Vec\map(vec[2, 1, 3], $a ==> $a * $a)); // Evaluates to vec[1,4,9]

Await and the Binary Pipe

Await cannot be used as an expression to the right of the pipe operator.

Was This Page Useful?
Thank You!
Thank You! If you'd like to share more feedback, please file an issue.