How to read an object from an array that has only 0 index in javascript

Question

[
  {
    "first" : {
      "email" : "[email protected]"
    },
    "second" : {
      "email" : "[email protected]"
    }
  }
]

as you know first and second is inside index 0 but how can read them using map without using like

user.map(c=>c.first.email)

I think the structure of data you posted here is wrong. Arrays cannot have named keys, they only have numbered keys called indexes/indices — rzwnahmd
– rzwnahmd, Commented Apr 12, 2020 at 14:33
This is neither a valid array nor a valid object. I think the first square brackets should be { instead of [ — kiranvj
– kiranvj, Commented Apr 12, 2020 at 14:38

Hasan · Accepted Answer · 2020-04-12 16:05:34Z

1

let users = [
  {email: "[email protected]"},
  {email: "[email protected]"}
]

// .map() return new array

let user = users.map((item) => item.email)
console.log(user)
console.log(user[0])
console.log(user[1])

answered Apr 12, 2020 at 16:05

Hasan

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Comments

symlink · Accepted Answer · 2020-04-12 14:49:29Z

0

It's no less clunky, but Object.keys() will achieve the same results

let obj = {
  "user": {
    "first": {
      "email": "[email protected]"
    },
    "second": {
      "email": "[email protected]"
    }
  }
}

let res = Object.keys(obj.user).map(el => {
  return obj.user[el].email
})

console.log(res)

edited Apr 12, 2020 at 14:49

answered Apr 12, 2020 at 14:35

symlink

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4 Comments

symlink Over a year ago

@Aziz one problem I saw with your code it the outer array should have an object inside of it. first and second are keys, javascript arrays don't have keys.

Aziz Over a year ago

it's from firebase not from me

symlink Over a year ago

@Aziz unfortunately it's not valid Javascript so it will always throw an error. You should research objects vs. arrays in javascript

Aziz Over a year ago

{ "user":{ "first" : { "email" : "[email protected]" }, "second" : { "email" : "[email protected]" } } } it basically like that

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