javascript - ramda 从基础对象 reshape 对象结构

Question

我确信可以获取一个对象并修改它并过滤它以获得另一个形状以便在 api 请求后更容易使用，但不幸的是我无法创建任何不涉及使用的优雅解决方案 path 和 prop 每个键例如。

const { prop, path } = R

const baseObject = {
  id: 1,
  name: 'object-one',
  info: {
   items: [
      { name: 'item-one', url: '/images/item-one.jpg' },
    ]
  },
}

const newObj = {
  id: prop('id', baseObject),
  name: prop('name', baseObject),
  // image is a new prop not found on the base object
  image: path(['info', 'items', 0, 'url'], baseObject),
}

console.log(newObj)

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>
<script src="https://codepen.io/synthet1c/pen/KyQQmL.js"></script>

任何人都可以告诉我是否有一种方法可以进行优雅的无点对象 reshape 。似乎应该有一些映射器函数可以将基础对象作为种子，但我似乎无法确定它。

我已经尝试过 evolve 但这并没有增加新的点，我已经尝试过 lens 但我可能错过了文档中的一些东西，因为我只能修改现有的键或使用 prop 进行过滤。

干杯，

edit. I was able to create a mapping function that will do the job, but is there a better way?

const { prop, path, toUpper, map, compose } = R

const baseObject = {
  id: 1,
  name: 'object-one',
  info: {
   items: [
      { name: 'item-one', url: '/images/item-one.jpg' },
    ]
  },
}
// createObjectFromSpec :: { k: f(a) } -> a -> { k: b }
const createObjectFromSpec = spec => baseObj => R.map(f => f(baseObj), spec);
const createObjectTypeOne = createObjectFromSpec({
  id: prop('id'),
  name: prop('name'),
  // image is a new prop not found on the base object
  image: path(['info', 'items', 0, 'url']),
})

const createObjectTypeTwo = createObjectFromSpec({
  id: prop('id'),
  name: prop('name'),
  // image is a new prop not found on the base object
  itemName: path(['info', 'items', 0, 'name']),
})

console.log(
  createObjectTypeOne(baseObject)
)

console.log(
  createObjectTypeTwo(baseObject)
)

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>
<script src="https://codepen.io/synthet1c/pen/KyQQmL.js"></script>

Answer 1

示例中的 createObjectFromSpec 函数在 Ramda 中作为 applySpec 存在。 .

const fn = R.applySpec({
  id: R.prop('id'),
  name: R.prop('name'),
  image: R.path(['info', 'items', 0, 'url'])
})

const result = fn({
  id: 1,
  name: 'object-one',
  info: {
   items: [
      { name: 'item-one', url: '/images/item-one.jpg' },
    ]
  },
})

console.log(result)

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>