Ramda：如何通过过滤功能保持原有结构

Question

我想做一个过滤功能如下图：

配置：

const arr = {
  id: 888,
  name: 'Library',
  bookLists: [{
      "name": "Book 1",
      "booked": "Y"
    }, {
      "name": "Book 2",
      "booked": "N"
    }, {
      "name": "Book 3",
      "booked": "Y"
    }]
  };

然后我尝试用标记'booked === Y'

过滤图书列表

R.compose(R.filter(x => x.booked === 'Y'), R.prop('bookLists'))(arr)

我得到了结果，它是正确的

[{"booked": "Y", "name": "Book 1"}, {"booked": "Y", "name": "Book 3"}]

不过，这是我想要的一部分。我怎样才能达到这样的结果？

{
  id: 888,
  name: 'Library',
  bookLists: [{
      "name": "Book 1",
      "booked": "Y"
    }, {
      "name": "Book 3",
      "booked": "Y"
    }]
  }

Answer 1

您可以使用 R.evolve:

R.evolve({bookLists: R.filter(x => x.booked === 'Y')})(arr)

结果将是：

{
  id: 888,
  name: 'Library',
  bookLists: [{
      "name": "Book 1",
      "booked": "Y"
    }, {
      "name": "Book 3",
      "booked": "Y"
    }]
  }

查看相关文档 here。

Ramda：如何通过过滤功能保持原有结构

Ramda: How to keep the original structure with filter function

javascript

ramda.js