Return non empty objects form array

Question

I am having array person of say 3 objects and form that i want to return objects named description. Now m using map to iterate over person, but what happens here is, if person is not having description then it returns undefined. I want at last to get array with only description objects(no undefined).

const person = [
{abc: 'abc',description:{}},
{qwe:'qwe', def:'def'},
{abcd: 'abcd',description:{}}
]

console.log(person.map(indivi => indivi.description))

Add a filter before map...

Usagi Miyamoto
– Usagi Miyamoto

2017-09-16 04:38:46 +00:00
Commented Sep 16, 2017 at 4:38 — Usagi Miyamoto
– Usagi Miyamoto, Commented Sep 16, 2017 at 4:38

Nicholas Tower · Accepted Answer · 2017-09-16 04:39:09Z

1

You could filter them out with .filter:

const person = [
    {abc: 'abc',description:{}},
    {qwe:'qwe', def:'def'},
    {abcd: 'abcd',description:{}}
]

const descriptions = person
    .filter(indivi => indivi.description)
    .map(indivi => indivi.description);

answered Sep 16, 2017 at 4:39

Nicholas Tower

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Comments

Nisarg Shah · Accepted Answer · 2017-09-16 04:38:44Z

0

You could apply a filter to remove objects not having a description property, before calling map on objects.

const person = [
{abc: 'abc',description:{}},
{qwe:'qwe', def:'def'},
{abcd: 'abcd',description:{}}
]

console.log(person.filter(t => t.description).map(indivi => indivi.description))

answered Sep 16, 2017 at 4:38

Nisarg Shah

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