CODEWITHSUNDEEP
javascriptarrays
user1354934
user1354934

Reputation: 8851

Trying to do a matching between a value from an object of objects to an array of objects

I'm trying to do a matching between an object of objects (A) and an array of objects (B).

Each object in the object of objects has a PID. Each object in the array of objects has a PID. I am trying to match A and B so I can get the occupation from A, and then append the occupation to each object in B. So, I am trying to get PID and Occupation into one. Can this even be done?

So, here's what A might look like:

{
  emp1: {
    PID: 2430
    Occupation: Welder
  },
  emp2: {
    PID: 432,
    Occupation: Electrician
  }
}

and B:

[
  {
    PID: 432
  },
  {
    PID: 2430
  }
]

Can this be easily done using something like lodash library?

Upvotes: 0

Views: 31

Answers (1)

strah
strah

Reputation: 6742

You would need to run a loop inside loop to match elements from B to A (or other way round) which is quite expensive. It would have been much easier if you could change structure of, let's say, A.

A = {
    2430: {
        name: "John",
        occupation: "Welder"
    },
    432: {
        name: "John",
        occupation: "Electrician"
    }
}

Then you can access data in A like this: A[2430]

Then your code could look like that:

B = B.map(function(el) {
    return {
        PID: el.PID,
        occupation: A[el.PID].occupation
    }
});
console.log(B);

So you have just one loop. Also you benefit from much faster access to data from A in the future.

Upvotes: 1

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