Pipeline operator (|>)
The experimental pipeline operator |>
(currently at stage 1) pipes the
value of an expression into a function. This allows the creation of chained function
calls in a readable manner. The result is syntactic sugar in which a function call with
a single argument can be written like this:
let url = "%21" |> decodeURI;
The equivalent call in traditional syntax looks like this:
let url = decodeURI("%21");
Syntax
expression |> function
The value of the specified expression
is passed into the
function
as its sole parameter.
Parameters
expression
- Any valid expression.
function
- Any function.
Examples
Chaining function calls
The pipeline operator can improve readability when chaining several functions.
const double = (n) => n * 2;
const increment = (n) => n + 1;
// without pipeline operator
double(increment(double(double(5)))); // 42
// with pipeline operator
5 |> double |> double |> increment |> double; // 42
Specifications
Browser compatibility
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