CODEWITHSUNDEEP
javascriptarraysjsondictionary
ggonmar
ggonmar

Reputation: 839

How to extract a certain value from JSON onto a map?

I have an array of maps with several values that I need to discard while keeping the map format.

I've played with the Arrays.map() function, but I only get to reach an array of values, without the map anymore.

The code would be:

x=[{"id":1, "name":"Bob"}, {"id":2, "name":"Sam"}, {"id":3, "name":"Lucy"}];

And the expected result I need is:

result=[{"id":1}, {"id":2}, {"id":3}]

What I tried:

>> result= x.map(x => x.id);
<< result = [1, 2, 3]

I am sure this must be extremely straightforward, but I'm struggling to pull this one off, can I get some advice?

Upvotes: 2

Views: 2734

Answers (1)

Ele
Ele

Reputation: 33726

In your approach, you're extracting the id value, however, you're not generating key-value objects.

You can use the function map and destructuring the param in order to extract the id value.

let x=[{"id":1, "name":"Bob"}, {"id":2, "name":"Sam"}, {"id":3, "name":"Lucy"}];
let result = x.map(({id}) => ({id}));
console.log(result);
.as-console-wrapper { min-height: 100%; }

Upvotes: 5

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