Javascript. Optimal way to join 2 sets of objects like in SQL?

Question

Let\'s assume that we have 2 sets of objects

set1 = [{\'id\':\'1\', \'x\':\'1\', \'y\':\'2\'}, {\'id\':\'2\', \'x\':\'2\', \'y\':\'2\'}]
set2 = [{\'id\':\'1         


        

Answer 1

Another option using Ramda:

const r = require('ramda')
const outerJoin = r.curry(function(relationName, set1, keyName1, set2, keyName2) {
    const processRecord = function(record1) {
        const key1 = record1[keyName1]
        const findIn2 = r.find(r.propEq(keyName2, key1))
        const record2 = findIn2(set2)
        record1[relationName] = record2
        return record1
    }
    return r.map(processRecord, set1)
})

assumptions

  //set1 is an array of objects
  set1 : [{}]
  //set1 has a property for the key of type T
  set1[keyName1] : T
  //set2 is an array of objects
  set2 : [{}]
  //set2 has a property for the key which is also of type T
  set2[keyName2] : T

Output

 [{
     ...set1 members...
     , relationName: ...set2 members...
  }]

I guess a better output might be (shouldn't be hard to get here):

 [{
     , leftObj:...set1 members...
     , rightObj: ...set2 members...
  }]

and add support for inner joins. But I was replacing some crappy code and needed to replicate the object hierarchy.