函数式编程之curry函数的实现

[qingfengmy]

柯里化：多参数变为单参数，英文名为curry

例子

例子：x+y
例子：（a+b）*h/2

const add = function(x, y) {
  return x + y;
};
const area = function(a, b, h) {
  return (a + b) * h / 2;
};
console.log(add(2, 3));// 5
console.log(area(4, 6, 10));// 50

柯里化实现

const curry = function(fn) {
  let args = [];
  const limit = fn.length; // 所需的满额参数数量
  return function justCurry(...params) {
    args = [...args, ...params];

    if (limit == args.length) {
      return fn(...args);
      // return fn.apply(this, args);
      // return fn.call(this, ...args);
    } else {
      return justCurry;
    }
  };
};

console.log(curry(add)(2)(3));// 5
console.log(curry(area)(4)(6)(10));// 50