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.
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