R:通过将一个函数与另一个函数组合来设置该函数的参数

// 定义两个简单的函数
const add = (a, b) => a + b;
const multiply = (a, b) => a * b;

// 定义一个函数组合工具
const compose = (...fns) => (x) => fns.reduceRight((acc, fn) => fn(acc), x);

// 组合函数
const addAndMultiply = compose(multiply(2), add(1));

// 使用组合函数
const result = addAndMultiply(3); // 结果为 8 (3 + 1) * 2 = 8
console.log(result);

const composeWithDefaults = (...fns) => (x) => {
  let result = x;
  for (let fn of fns) {
    result = fn(result);
  }
  return result;
};

const add = (a, b = 0) => a + b;
const multiply = (a, b = 1) => a * b;

const addAndMultiply = composeWithDefaults(multiply(2), add(1));

const result = addAndMultiply(3); // 结果为 8 (3 + 1) * 2 = 8
console.log(result);