将过滤后的数组映射到仅包含属性子集的新数组

Question

如何将此过滤器的值映射到新数组。我的过滤器工作正常，但我的最终结果需要来自数组 im 过滤器的属性。我正在使用 ramda。

let bugs = bugsfromBugzilla();
let users = utils.ReadJsonFile('./team.json');
      let data = R.filter(bug => {
        return R.any(filter => {
          return R.contains(filter.assignee, bug.assigned_to);
        }, users);
      }, bugs);

用户数组是这样的：

[
  {
    "assignee": "jesse@email.com",
    "id": 843568062370470
  },
  {
    "assignee": "Ryan@email.com",
    "id": 848490202942168
  }
]

我需要 id 成为数据变量的一部分。如果我只能在新数组中映射我想要的属性，那也很好。

Answer 1

如果没有示例输入或输出数据，仍然不完全清楚这里需要什么。（好的，我们确实有示例用户，但没有示例错误。）

使用`pipe`

不过，我认为这可能很接近：

const {contains, pipe, filter, any, project, map, assoc, prop, find} = R

const checkMatch = bug => user => contains(user.assignee, bug.assigned_to)

const extract = (users) => pipe(
  filter(bug => any(checkMatch(bug), users)),
  project(['bug_id', 'assigned_to', 'bar']),
  map(bug => assoc('user_id', prop('id', find(checkMatch(bug), users)), bug)),
)

const bugs = [
  {bug_id: 'abc', assigned_to: "jesse@email.com",           foo: 1, bar: 42, baz: 'z'},
  {bug_id: 'def', assigned_to: "fred@flintstone.com",       foo: 2, bar: 43, baz: 'y'},
  {bug_id: 'ghi', assigned_to: "jesse@email.com",           foo: 3, bar: 44, baz: 'x'},
  {bug_id: 'jkl', assigned_to: "Ryan@email.com",            foo: 4, bar: 45, baz: 'w'},
  {bug_id: 'mno', assigned_to: "Mr. Ryan <Ryan@email.com>", foo: 5, bar: 46, baz: 'v'},
  {bug_id: 'pqr', assigned_to: "wilma@flintstone.com",      foo: 6, bar: 47, baz: 'u'}
]
const users = [
  {"assignee": "jesse@email.com", "id": 843568062370470},
  {"assignee": "Ryan@email.com", "id": 848490202942168}
]

console.log(extract(users)(bugs))

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

请注意，由于评论 question/response 之间的延迟，我在这里猜测您为什么需要 contains。我猜你可能有一个像 Mr. Ryan <Ryan@email.com> 这样的值需要匹配 Ryan@email.com。如果你有完全匹配，我会改为写：

const checkMatch = bug => user => user.assignee === bug.assigned_to

正在尝试`reduce`

通常我发现这样的解决方案，将步骤组合在一起，比基于 reduce 的解决方案更干净。但是因为这些步骤都比较复杂，而且我又重用了筛选中找到的用户来更新对象，所以我尝试了一个reduce来进行比较。我实际上更喜欢它：

const {reduce, find, contains, append, assoc, pick} = R

const extract = (users) => reduce((all, bug) => {
  const user = find( user => contains(user.assignee, bug.assigned_to), users);
  return user
    ? append(assoc('user_id', user.id, pick(['bug_id', 'assigned_to', 'bar'], bug)), all)
    : all
}, [])
                                    
const bugs =[{"assigned_to": "jesse@email.com", "bar": 42, "baz": "z", "bug_id": "abc", "foo": 1}, {"assigned_to": "fred@flintstone.com", "bar": 43, "baz": "y", "bug_id": "def", "foo": 2}, {"assigned_to": "jesse@email.com", "bar": 44, "baz": "x", "bug_id": "ghi", "foo": 3}, {"assigned_to": "Ryan@email.com", "bar": 45, "baz": "w", "bug_id": "jkl", "foo": 4}, {"assigned_to": "Mr. Ryan <Ryan@email.com>", "bar": 46, "baz": "v", "bug_id": "mno", "foo": 5}, {"assigned_to": "wilma@flintstone.com", "bar": 47, "baz": "u", "bug_id": "pqr", "foo": 6}]

const users = [{"assignee": "jesse@email.com", "id": 843568062370470}, {"assignee": "Ryan@email.com", "id": 848490202942168}]

console.log(extract(users)(bugs))

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

（同样，如果数据支持，我会选择 user.assignee === bug.assigned_to 而不是 contains。）

将过滤后的数组映射到仅包含属性子集的新数组

Map filtered array to new array with only a subset of attributes

arrays

filter

ramda.js

使用`pipe`

正在尝试`reduce`

将过滤后的数组映射到仅包含属性子集的新数组

Map filtered array to new array with only a subset of attributes

arrays

filter

ramda.js

使用pipe

正在尝试reduce

使用`pipe`

正在尝试`reduce`