Convert object values to string when values are: undefined, null or boolean [duplicate]

Question

I have this object:

const obj = {
 key1: false,
 key2: "",
 key3: undefined,
 key4: null
}

Now, I want to use Object.values(obj) so I will get an array of values. But false, undefined & null return as an empty string or in the false case it returns 1 or 0.

So I want to convert the object values to strings.

What will be the best way to do so?

JSON.stringify(obj) will get you most of the way there, but key3: undefined is being treated as if it had never been defined at all. — evolutionxbox
– evolutionxbox, Commented Sep 8, 2020 at 11:26
"But false, undefined & null return as an empty string or in the false case it returns 1 or 0" - Nope, that's not how Object.values() works — Andreas
– Andreas, Commented Sep 8, 2020 at 11:26
Does this answer your question? Is there an __repr__ equivalent for javascript? — hl037_
– hl037_, Commented Sep 8, 2020 at 11:27
You can map the values to strings, Object.values(obj).map(String) if you want an array of strings...? — Nick Parsons
– Nick Parsons, Commented Sep 8, 2020 at 11:30

Yevhen Horbunkov · Accepted Answer · 2024-05-17 12:00:37Z

1

You may try template strings:

const srcObject = {
  key1: false,
  key2: "",
  key3: undefined,
  key4: null
}

const result = Object
  .values(srcObject)
  .map(v => `${v}`)

console.log(result)

Or String()

const srcObject = {
  key1: false,
  key2: "",
  key3: undefined,
  key4: null
}

const result = Object
  .values(srcObject)
  .map(String)

console.log(result)

edited May 17, 2024 at 12:00

answered Sep 8, 2020 at 11:29

Yevhen Horbunkov

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4 Comments

Alan Omar Over a year ago

I was thinking Object.values(obj).map(el => el?el:${el})

Alan Omar Over a year ago

true that is right.

Shira Over a year ago

@Yevgen Gorbunkov It works but some of the object values can be objects or array. So I wrote this: Object.values(obj).map(v => !v ? ${v}: v); But if one of the values will be 'True' it wont go through

Shira Over a year ago

@Yevgen Gorbunkov Solved it with this one: Object.values(item).map(v => !v ? ${v}: v===true ? ${v}: v);

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