How to compare the property of object entries of 2 length arrays and merge into one?

Question

I am trying to compare values1 and values2 by their property and the values. If the value of the name property matches up with each other, I want to push the property and value to value3.

But I am getting this error: Cannot read property 'age' of undefined

const values1 = [
  { name: 'dog', surname: 'good', skills: 'programming' },
  { name: 'cat', surname: 'soft', skills: 'engineer' },
  { name: 'elephant', surname: 'big', skills: 'programming' }
]

const values2 = [
  { name: 'cat', age: '12' },
  { name: 'elephant', age: '13' },
]

const values3 = values1.map((value1) => {
  return Object.assign(value1, { age: values2.filter(value2 => value2.name === value1.name)[0].age })
})

console.log(values3)

This is the result I would like to return.

{
name: 'cat',
surname: 'soft',
skills: 'engineer'
age: '12'
},
{
name: 'dog',
surname: 'good',
skills: 'programming',
},
{
name: 'elephant',
surname: 'big',
skills: 'programming'
age: '23'
}

how about object with name `dog`. do you want to exlucde it in values3? — Saeed Shamloo, Dec 14 '21 at 15:57
since ```dog``` is not in ```values2``` It can be ignored. like a condition is passed — noobdev123, Dec 14 '21 at 15:58

Saeed Shamloo · Accepted Answer · 2021-12-14T16:14:18.147

1

You can do it like this:

const values1 = [{
    name: 'dog',
    surname: 'good',
    skills: 'programming'
  },
  {
    name: 'cat',
    surname: 'soft',
    skills: 'engineer'
  },
  {
    name: 'elephant',
    surname: 'big',
    skills: 'programming'
  }
]

const values2 = [{
    name: 'cat',
    age: '12'
  },
  {
    name: 'elephant',
    age: '13'
  },
]

const values3 = values1.map((value1) => {
  const sameObj = values2.find(value2 => value2.name === value1.name);
  if (sameObj) {
    return { ...value1, age: sameObj.age }
  }
  return value1;
});

console.log(values3)

edited Dec 14 '21 at 16:14

answered Dec 14 '21 at 15:59

Saeed Shamloo

6,199
1
7
18

Hey I realize I made a mistake in the question. Could you check again? – noobdev123 Dec 14 '21 at 16:12
ok, let me check it. – Saeed Shamloo Dec 14 '21 at 16:13
Could you check my answer again. – Saeed Shamloo Dec 14 '21 at 16:15
excellent! it worked. this is a larger project of mine and this code was just an example. On my project the ```age``` is undefined. do you know why that might be? – noobdev123 Dec 14 '21 at 16:23
You're welcome, is your data structure the same as you put in the question? – Saeed Shamloo Dec 14 '21 at 16:25
no its different – noobdev123 Dec 14 '21 at 16:32
would you like put an example of your project's structure? – Saeed Shamloo Dec 14 '21 at 16:35

How to compare the property of object entries of 2 length arrays and merge into one?

1 Answers1