30秒学会 JavaScript 片段 – compose

Performs right-to-left function composition.

Use Array.prototype.reduce() to perform right-to-left function composition.
The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.

代码片段

const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));

使用样例

const add5 = x => x + 5;
const multiply = (x, y) => x * y;
const multiplyAndAdd5 = compose(
  add5,
  multiply
);
multiplyAndAdd5(5, 2); // 15