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.
expression
Any valid expression.
function
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
| 规范 |
|---|
|
Pipeline operator
The definition of 'Pipeline operator' in that specification. |
| Desktop | Mobile | Server | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipeline operator (
|>
)
|
Chrome No | Edge No | Firefox No | IE No | Opera No | Safari No | WebView Android No | Chrome Android No | Firefox Android No | Opera Android No | Safari iOS No | Samsung Internet Android No | nodejs No |
不支持
实验。期望将来行为有所改变。