Rewrote pipe such that the first function may have any arity.

This commit is contained in:
Justin Lee
2017-12-14 14:44:38 -08:00
parent c286d55182
commit cd5eb04c4f

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@ -1,8 +1,18 @@
### Pipe ### Pipe
Use `Array.reduce()` to pass value through functions. Use `Array.reduce()` to perform left-to-right function composition. The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.
```js ```js
const pipe = (...funcs) => arg => funcs.reduce((acc, func) => func(acc), arg); const pipe = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)))
// pipe(btoa, x => x.toUpperCase())("Test") -> "VGVZDA==" /*
const add5 = (x) => x + 5
const multiply = (x, y) => x * y
const multiplyAndAdd5 = pipe(
multiply,
add5
)
multiplyAndAdd5(5, 2) -> 15
*/
``` ```