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");
expression |> function
The value of the specified
expression is passed into the
function as its sole parameter.
- Any valid expression.
- Any function.
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
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