javascript - 我如何用 ramda 编写该函数？

Question

如何以 ramda 方式创建 addGreeting 函数？

我尝试创建一个函数，但它认为这不是最佳解决方案。

const animal = {};

const addName = R.assoc('name');

const addGreeting = (transformString) => (animal) => {
  return R.assoc('greeting', transformString(animal), animal);
};

const createAnimal = 
 R.pipe(
   addName('Igor'),
   addGreeting(animal => `Hello ${animal.name}`),
 );

createAnimal(animal);

我希望用 ramda 编写 addGreeting 函数。

---

UPD：我的解决方案

const addName = R.assoc('name');

const addGreeting = 
  (transformString) => 
    R.converge(
      R.merge,
      [
        R.applySpec({
          greeting: transformString
        }),
        R.defaultTo({})
      ]
    )

const createAnimal = 
 R.pipe(
   addName('Igor'),
   addGreeting(animal => `Hello ${animal.name}`),
 );

createAnimal({});

标签： javascriptfunctional-programmingramda.js

Answer 1

您可以使用R.curry创建addGreeting和R.applySpec创建动物创建功能：

const { curry, applySpec, identity } = R

const addGreeting = curry((transformString, name) => transformString(name));

const createAnimal = applySpec({
  name: identity,
  greeting: addGreeting(name => `Hello ${name}`)
})

console.log(createAnimal('Igor'));

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js"></script>