If an array contains a property, add it to the object

Question

If an array contains a property, add it to the object

I have a set of objects with unique identifiers, and there's also an array containing specific identifier values. I want to mark the objects that have an id matching any value in the array by adding a new property called found and setting it to true. My initial thought is to utilize the findIndex function for this operation.

const arrayOfObjects = [ { id: '123' }, { id: '456' }, { id: '789' } ]
const arrayOfIds = ['456']

Desired Result

const arrayOfObjects = [ { id: '123' }, { id: '456', found: true }, { id: '789' } ]

javascript arrays object ecmascript-6

Answer 1

Answer №1

const objectArray = [ { id: '123' }, { id: '456' }, { id: '789' } ]
const idArray = ['456']

objectArray.map((obj) => {
  if(idArray.includes(obj.id)) {
    obj.found = true;
  }
})

console.log(objectArray);

Answer 2

const objectArray = [ { id: '123' }, { id: '456' }, { id: '789' } ]
const idArray = ['456']

objectArray.map((obj) => {
  if(idArray.includes(obj.id)) {
    obj.found = true;
  }
})

console.log(objectArray);

Answer 3

Answer №2

If you convert your arrayOfIds to a Set, it can significantly improve lookup speed at O(1).

const idsSet = new Set(arrayOfIds);
const updatedObjects = arrayOfObjects.map(item => {
  if (idsSet.has(item.id)) {
    item.updatedField = true;
  }
  return item;
});

Answer 4

If you convert your arrayOfIds to a Set, it can significantly improve lookup speed at O(1).

const idsSet = new Set(arrayOfIds);
const updatedObjects = arrayOfObjects.map(item => {
  if (idsSet.has(item.id)) {
    item.updatedField = true;
  }
  return item;
});

Answer 5

Answer №3

To utilize the power of JavaScript, you can convert an array into a Set and then take advantage of Array#map in conjunction with Set#has.

const arrayOfPeople = [ { name: 'Alice' }, { name: 'Bob' }, { name: 'Charlie' } ]
const namesToFind = new Set(['Bob']);
const result = arrayOfPeople.map(person => ({...person, ...namesToFind.has(person.name) && {found: true}}));
console.log(result);

Answer 6

To utilize the power of JavaScript, you can convert an array into a Set and then take advantage of Array#map in conjunction with Set#has.

const arrayOfPeople = [ { name: 'Alice' }, { name: 'Bob' }, { name: 'Charlie' } ]
const namesToFind = new Set(['Bob']);
const result = arrayOfPeople.map(person => ({...person, ...namesToFind.has(person.name) && {found: true}}));
console.log(result);

Answer 7

Answer №4

To iterate through the objects and extend the object using the found property, you can employ the mapping technique.

const updatedOutput = arrayOfObjects.map((item) => {
   if (arrayOfIds.includes(item.id)) {
      return {  ...item, found: true };
   }
   return item;
});

Answer 8

To iterate through the objects and extend the object using the found property, you can employ the mapping technique.

const updatedOutput = arrayOfObjects.map((item) => {
   if (arrayOfIds.includes(item.id)) {
      return {  ...item, found: true };
   }
   return item;
});

Answer 9

Answer №5

To simplify the process, you can create a lookup object based on the 'arrayOfIds'. By mapping through 'arrayOfIds' and creating key-value pairs with the ids as keys and an object with 'found' set to true as values, you can then use this lookup object when iterating over the 'arrayOfObjects' array to make necessary modifications.

const arrayOfObjects = [{ id: '123' }, { id: '456' }, { id: '789' }];
const arrayOfIds = ['456'];
const lookup = Object.fromEntries(arrayOfIds.map((x) => [x, { found: true }]));
const ret = arrayOfObjects.map((x) => ({ ...x, ...lookup[x.id] }));
console.log(ret);

Answer 10

To simplify the process, you can create a lookup object based on the 'arrayOfIds'. By mapping through 'arrayOfIds' and creating key-value pairs with the ids as keys and an object with 'found' set to true as values, you can then use this lookup object when iterating over the 'arrayOfObjects' array to make necessary modifications.

const arrayOfObjects = [{ id: '123' }, { id: '456' }, { id: '789' }];
const arrayOfIds = ['456'];
const lookup = Object.fromEntries(arrayOfIds.map((x) => [x, { found: true }]));
const ret = arrayOfObjects.map((x) => ({ ...x, ...lookup[x.id] }));
console.log(ret);

Answer 11

Answer №6

To iterate through the array of objects and update them accordingly, you can use a combination of the map method and the includes function to determine if an object needs modification. If the condition is met, add show: true by spreading the existing object; otherwise, return the original object as it is. This code snippet demonstrates this concept:

const arrayOfObjects = [{ id: "123" }, { id: "456" }, { id: "789" }];
const arrayOfIds = ["456"];
const result = arrayOfObjects.map((item) => {
  if (arrayOfIds.includes(item.id)) {
      return {
              ...item,
              show: true
      };
  }
  return item;
});
console.log(result);

Answer 12

To iterate through the array of objects and update them accordingly, you can use a combination of the map method and the includes function to determine if an object needs modification. If the condition is met, add show: true by spreading the existing object; otherwise, return the original object as it is. This code snippet demonstrates this concept:

const arrayOfObjects = [{ id: "123" }, { id: "456" }, { id: "789" }];
const arrayOfIds = ["456"];
const result = arrayOfObjects.map((item) => {
  if (arrayOfIds.includes(item.id)) {
      return {
              ...item,
              show: true
      };
  }
  return item;
});
console.log(result);

If an array contains a property, add it to the object

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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