cross referencing an array of objects with another

Question

Say you have to find out the names of the students that are in both teamBlue & teamRed

Suppose that the arrays are of unequal length as shown below, how would you go about approching this.
if someone could just point me in the right direction id really appreciate it

teamRed: [
    {
        "id": '1',
        "name": "jenny"
    },
    {
        "id": '2',
        "name": "kenny"
    },
    {
        "id": '3',
        "name": "mike"
    },
     {
        "id": '4',
        "name": "danny"
    }
]


teamBlue: [
    {
        "id": '1',
        "name": "joey"
    },
    {
        "id": '2',
        "name": "kenny"
    },
    {
        "id": '3',
        "name": "mike"
    }
]

build a set for the first array (any of them actually) and cross reference the other array with the set. Reference for Set: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — kkesley
– kkesley, Commented Jul 24, 2020 at 6:03

Dharman · Accepted Answer · 2020-07-24 06:26:55Z

2

You can do that simply using Array.forEach() and Array.find.

Here is a simple example:

const teamRed = [ ... ]
const teamBlue = [ ... ]
const studentsInBothTeams = []

teamRed.forEach(_teamRed => {
  const existsOnTeamBlue = teamBlue.find(
    _teamBlue => _teamBlue.name === _teamRed.name
  )

  if (existsOnTeamBlue) {
    studentsInBothTeams.push(_teamRed)
  }
})

console.log(studentsInBothTeams)

The result is:

[
  {
    "id": "2",
    "name":"kenny"
  },
  {
    "id": "3",
    "name": "mike"
  }
]

edited Jul 24, 2020 at 6:26

Dharman♦

33.9k27 gold badges106 silver badges157 bronze badges

answered Jul 24, 2020 at 6:21

Nurul Huda

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