How to get all values of a specific key in array of objects?

Question

I have array of objects like this

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};
const object2 = {
  a: 'somestring2',
  b: 42,
  c: false
};
const object3 = {
  a: 'somestring3',
  b: 42,
  c: false
};
const arr = [object1,object2,object3]

i want to get all the values of 'a' key. so result be

['somestring','somestring2','somestring3']

I tried Object.values() but it gets me all values of all keys, which is not the desired output.

Looks like a good read: contactmentor.com/javascript-map-array-of-objects — PM 77-1
– PM 77-1, Commented Aug 3, 2022 at 14:44

StepUp · Accepted Answer · 2022-08-03 14:49:44Z

4

Just use map() function:

const arr = [object1,object2,object3].map(({a}) => (a))

An example:

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};
const object2 = {
  a: 'somestring2',
  b: 42,
  c: false
};
const object3 = {
  a: 'somestring3',
  b: 42,
  c: false
};
const arr = [object1,object2,object3].map(({a}) => (a))
console.log(arr)

edited Aug 3, 2022 at 14:49

answered Aug 3, 2022 at 14:46

StepUp

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2 Comments

Abdel-Rahman Over a year ago

it returns [{a: 'somestring'},{a: 'somestring2'}, {a: 'somestring3'}] i want it to return ['somestring','somestring2','somestring3']

StepUp Over a year ago

@Abdel-Rahman please, see my updated answer

Guzzly Puzzly · Accepted Answer · 2022-08-07 14:32:10Z

1

Have you tried const arr = [object1.a, object2.a, object3.a]? That might work

edited Aug 7, 2022 at 14:32

answered Aug 3, 2022 at 14:46

Guzzly Puzzly

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2 Comments

Darrin Cullop Over a year ago

Nothing in JavaScript is encapsulated by default. There are ways to do it, but without those explicit techniques, all properties and methods are available. Also, while your answer would produce the correct result, I believe they wanted a general solution that doesn't require explicitly knowing about all the elements of the array.

Community Over a year ago

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

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