Extract values from JavaScript object by key

Question

I receive a JSON from a REST service which is represented by the following JavaScript object:

[
    {
        name: 'demo1',
        contentType: 'text/plain',
        lang: 'en-US',
        type: 'FILE',
        revision: 5
    },
    {
        name: 'demo2',
        contentType: 'text/plain',
        lang: 'en-US',
        type: 'FILE',
        revision: 29
    }
]

From this object I'd like to extract all values from the name key, i.e. in the end I have a new array with the values [demo1, demo2].

I tried running a for-loop over Object.entries() but this seems somewaht tedious. There is probably a much easier way.

And have you tried anything yourself? – Scott Sauyet May 01 '20 at 14:06 — Scott Sauyet, May 01 '20 at 14:06

score 1 · Answer 1 · answered May 01 '20 at 14:06

1

Use .map() and an arrow function.

const theArray = [
    {
        name: 'demo1',
        contentType: 'text/plain',
        lang: 'en-US',
        type: 'FILE',
        revision: 5
    },
    {
        name: 'demo2',
        contentType: 'text/plain',
        lang: 'en-US',
        type: 'FILE',
        revision: 29
    }
]

console.log(theArray.map(obj => obj.name))

answered May 01 '20 at 14:06

WillD

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2

This is an often-asked duplicate of [this question](https://stackoverflow.com/questions/19590865/from-an-array-of-objects-extract-value-of-a-property-as-array). – T.J. Crowder May 01 '20 at 14:07

Extract values from JavaScript object by key

1 Answers1