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javascriptarraysjsonmultidimensional-array
rraghuva
rraghuva

Reputation: 131

extract key as well as value from a array of objects

I have searched this question on google but doesnt find any suitable solution.

Suppose i have an array of objects as below --

 "points":[{"pt":"Point-1","value":"Java, j2ee developer"},{"pt":"Point-2","value":"Experienced in Core Java, Spring, Hibernate, JPA, Big Data, SOA, BPEL"}]

Now from above array i want to extract key as wellas values for a specific pair so that my result will look as below --

 [{"value":"Java, j2ee developer"},{"value":"Experienced in Core Java, Spring, Hibernate, JPA, Big Data, SOA, BPEL"}]

I know this can be done using manual looping. But i dont wanna loop through. Is it possible to get result in one go using lodash or some other api ?

Upvotes: 0

Views: 122

Answers (2)

Dan Prince
Dan Prince

Reputation: 29989

If you're using the latest version of Javascript you can also make use of destructuring in your call to map, allowing you to extract the properties you care about in an elegant way.

points.map(({ value }) => ({ value }));

The arrow function takes a point object as an argument and uses { value } to destructure the point.value property into a variable called value.

Then it returns a shorthand object literal which uses value as both the key and the value.

When compiled with Babel, we get:

points.map(function (_ref) {
  var value = _ref.value;
  return { value: value };
});

Upvotes: 1

madox2
madox2

Reputation: 51851

You can map your array:

var points = [
    { 'pt': 'Point-1', 'value': 'Java, j2ee developer' },
    { 'pt': 'Point-2', 'value': 'Experienced in ...' }
];

var result = points.map(function(p) {
    return { value: p.value };
});

Upvotes: 2

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