Ramda - get array of objects using ids from other array

Question

I have two sets of data and I would like to use the first one to get an array of objects from the second one. I tried to deal with it by myself but I am missing few steps.

Here is set of ids to use:

const idSet = {
  "41": {
    "id": "41"
  },
  "42": {
    "id": "42"
  },
  "43": {
    "id": "43"
  }
}

And here is second set:

const nodes = {
  "3": {
    "nodeCommentId": 3,
    "nodeId": 43,
  },
  "4": {
    "nodeCommentId": 4,
    "nodeId": 41
  },
  "6": {
    "nodeCommentId": 6,
    "nodeId": 42
  },
  "7": {
    "nodeCommentId": 7,
    "nodeId": 44
  },
}

I need to search by id and nodeId so I tried to use something like this to get only ids from first set:

const ids = R.compose(
  R.values(),
  R.pluck('id')
)(idSet)

I also came up with something like: R.filter(R.compose(R.flip(R.contains)(ids), R.prop('nodeId')), nodes);

But then I have nodeId which is a number and not a string plus I need an array of objects without keys.

Desired output:

[
  {
    nodeCommentId: 3,
    nodeId: 43
  },
  {
    nodeCommentId: 4,
    nodeId: 41
  },
  {
    nodeCommentId: 6,
    nodeId: 42
  }
]

Any help will be appreciated.

You can convert ids to numerics with R.map(Number). Then your later filtering works: jsbin.com/nofatayesi/edit?js,console — VLAZ
– VLAZ, Commented Mar 29, 2021 at 16:41
@ScottSauyet I am trying to get an array with objects 41, 42, 43 inside — omygoodness
– omygoodness, Commented Mar 29, 2021 at 16:47
I doubt you just mean [41, 42, 43], so could you edit the post to include the desired output? — Scott Sauyet
– Scott Sauyet, Commented Mar 29, 2021 at 16:49

Scott Sauyet · Accepted Answer · 2021-03-29 17:06:30Z

This is probably too ugly to use, but it might be a start at a nice solution:

const nodesById = (idSet) => {
  const ids = map (Number, pluck ('id') (values (idSet)))
  return pipe (values, filter (pipe (prop('nodeId'), contains(__, ids))))
}

const idSet = {41: {id: "41"}, 42: {id: "42"}, 43: {id: "43"}}
const nodes = {3: {nodeCommentId: 3, nodeId: 43, }, 4: {nodeCommentId: 4, nodeId: 41}, 6: {nodeCommentId: 6, nodeId: 42}, 7: {nodeCommentId: 7, nodeId: 44}}

console .log (
  nodesById (idSet) (nodes)
)

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.27.1/ramda.min.js"></script>
<script>const {map, pluck, values, pipe, filter, prop, contains, __} = R </script>

I'm sure that with a little work, we could make this entirely point-free, but I doubt that will help readability.

Ori Drori · Accepted Answer · 2021-03-30 15:52:53Z

Transform the idSet to an array of numbers, and then user R.innerJoin to get the items with the matching nodeId:

const { pipe, values, pluck, map, innerJoin, __, curry } = R

const getIds = pipe(values, pluck('id'), map(Number))

const getNodesById = curry((idSet, nodes) => 
  pipe(
    values, 
    innerJoin(
      ({ nodeId }, id) => nodeId === id, 
      __,
      getIds(idSet)
    )
  )(nodes)
)

const idSet = {41: {id: "41"}, 42: {id: "42"}, 43: {id: "43"}}
const nodes = {3: {nodeCommentId: 3, nodeId: 43, }, 4: {nodeCommentId: 4, nodeId: 41}, 6: {nodeCommentId: 6, nodeId: 42}, 7: {nodeCommentId: 7, nodeId: 44}}

const result = getNodesById(idSet)(nodes)

console.log(result)

.as-console-wrapper {max-height: 100% !important; top: 0}

<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.27.1/ramda.min.js"></script>

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