compose

78 bytes

since v12.1.0

使用方法

在函数组合中，每个函数都被给予下一个函数作为参数，并且必须调用它才能继续执行。

import * as _ from "radashi";

const useZero = (fn: any) => () => fn(0);
const objectize = (fn: any) => (num: any) => fn({ num });
const increment =
  (fn: any) =>
  ({ num }: any) =>
    fn({ num: num + 1 });
const returnArg = (arg: any) => (args: any) => args[arg];

const composed = _.compose(
  useZero,
  objectize,
  increment,
  increment,
  returnArg("num")
);

composed(); // => 2

如果您以前没有见过这种写法，这可能有点令人困惑。这里是一个分解的组合。它等同于上面的代码。

const decomposed = useZero(objectize(increment(increment(_.returnArg("num")))));

decomposed(); // => 2