Javascript Array and Object

Question

I have two arrays of objects.Where each object has different properties, Like this

    let array1=[
    {id:121122,name:"Matt Jeff"},
    {id:121123,name:"Philip Jeff"}, 
    {id:121124,name:"Paul Jeff"}]
    
    let array2=[
    {owner_id:121122,id:1211443,value:18},
    {owner_id:121127,id:1211428,value:22}]

How can I check if the owner_id in the array2 is equal to the id in array1 then return the new array like this

let newArray=[
{owner_id:121122,id:1211443,value:18}
]

Where the owner_id in array2 is equal to the id in array1.

Guerric P · Accepted Answer · 2021-05-06 10:49:35Z

1

If I correctly understand what you need, you could do like this:

let array1 = [{
    id: 121122,
    name: "Matt Jeff"
  }, {
    id: 121123,
    name: "Philip Jeff"
  }, {
    id: 121124,
    name: "Paul Jeff"
  }
]

let array2 = [{
    owner_id: 121122,
    id: 1211443,
    value: 18
  }, {
    owner_id: 121127,
    id: 1211428,
    value: 22
  }
]

const result = array2.filter(({ owner_id }) => array1.some(({ id }) => id === owner_id));

console.log(result);

answered May 6, 2021 at 10:49

Guerric P

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Comments

Giovanni Esposito · Accepted Answer · 2021-05-06 10:52:20Z

You could try with nested for like:

let array1=[
    {id:121122,name:"Matt Jeff"},
    {id:121123,name:"Philip Jeff"}, 
    {id:121124,name:"Paul Jeff"}]
    
    let array2=[
    {owner_id:121122,id:1211443,value:18},
    {owner_id:121127,id:1211428,value:22}];
    
let result = [];

for(let i = 0; i < array1.length; i++) {
   for(let j = 0; j < array2.length; j++) {
      if (array1[i].id === array2[j].owner_id) {
         result.push(array2[j]);
      }
   }
}

console.log(result)

DecPK · Accepted Answer · 2021-05-06 11:00:58Z

EFFICIENT WAY: Using Set and filter

O(m) - Iterating on array1 and Storing the id in Set

O(n) - Iterating on the array2 and filtering the result which include O(1) to search in Set;

let array1 = [
  { id: 121122, name: "Matt Jeff" },
  { id: 121123, name: "Philip Jeff" },
  { id: 121124, name: "Paul Jeff" },
];

let array2 = [
  { owner_id: 121122, id: 1211443, value: 18 },
  { owner_id: 121127, id: 1211428, value: 22 },
];

const dict = new Set();
array1.forEach((o) => dict.add(o.id));

const result = array2.filter((o) => dict.has(o.owner_id));

console.log(result);

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