How to add condition to compare two array and change value of match array

Question

I want to compare two array in that i want to change value of matching id.

Please refer bellow array's and result.

let array1 =[
  {
    "id": 1,
    "value": false
  },
  {
    "id": 2,
    "value": false
  },
  {
    "id": 3,
    "value": true
  },
  {
    "id": 4,
    "value": false
  }
]


let array2 = [
  {
    "id": 1
  },
  {
    "id": 4
  }
]

I want to use underscore library to compare this arrays and return the compare array value result as like below array

result = [
  {
    "id": 1,
    "value": true
  },
  {
    "id": 2,
    "value": false
  },
  {
    "id": 3,
    "value": true
  },
  {
    "id": 4,
    "value": true
  }
]

Yosvel Quintero · Accepted Answer · 2019-11-04 12:12:08Z

2

You can use Array.prototype.map():

const array1 =[{"id": 1,"value": false},{"id": 2,"value": false},{"id": 3,"value": true},{"id": 4,"value": false}]
const array2 = [{"id": 1},{"id": 4}]

const result = array1.map(({id, value}) => ({
  id,
  value: value || array2.some(item => item.id === id)
}))

console.log(result)

edited Nov 4, 2019 at 12:12

answered Nov 4, 2019 at 12:06

Yosvel Quintero

19.1k5 gold badges39 silver badges47 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Vo Kim Nguyen · Accepted Answer · 2019-11-04 12:08:48Z

1

Another solution by using map

let array1 =[
  {
    "id": 1,
    "value": false
  },
  {
    "id": 2,
    "value": false
  },
  {
    "id": 3,
    "value": true
  },
  {
    "id": 4,
    "value": false
  }
]


let array2 = [
  {
    "id": 1
  },
  {
    "id": 4
  }
]

const resultArr = array1.map((item) => {
      if (array2.findIndex((item2) => {return item2.id == item.id}) !== - 1) {
          item.value = true;
      }
      return item; 
  })
  console.log(resultArr);

answered Nov 4, 2019 at 12:08

Vo Kim Nguyen

1,65311 silver badges15 bronze badges

Comments

Hassan Imam · Accepted Answer · 2019-11-04 12:08:05Z

0

You can use lodash.map with lodash.some to check for object and update the value.

let array1 =[ { "id": 1, "value": false }, { "id": 2, "value": false }, { "id": 3, "value": true }, { "id": 4, "value": false } ],
    array2 = [ { "id": 1 }, { "id": 4 } ],
    result = _.map(array1, o => ({...o, value : _.some(array2, ({id}) => id === o.id) || o.value}));
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

answered Nov 4, 2019 at 12:08

Hassan Imam

22.6k6 gold badges45 silver badges53 bronze badges

Comments

Dino · Accepted Answer · 2019-11-04 15:40:31Z

0

You can try this:

array1.forEach(item => {
    item.value = item.value || array2.some(item2 => item2.id === item.id)
})

edited Nov 4, 2019 at 15:40

Dino

8,37213 gold badges50 silver badges93 bronze badges

answered Nov 4, 2019 at 12:04

Andrei Panturu

1094 bronze badges

Collectives™ on Stack Overflow

How to add condition to compare two array and change value of match array

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related