CODEWITHSUNDEEP
javascriptlodash
Jan Tajovsky
Jan Tajovsky

Reputation: 1211

Lodash pickAs - pick properties from object into new one under different keys

Is there any way how to pick property from object into new object under different key?

E.g.:

// pseudo
let a = {prop1: 'a', prop2: 'b', prop3: 'c'}
_.pickAs(a, {prop1: 'first', prop3: 'second'}
// {first: 'a', second: 'c'}

Upvotes: 1

Views: 1690

Answers (2)

Ori Drori
Ori Drori

Reputation: 191976

You can use Array.reduce() with Object.entries() to create a pickAs() method:

const a = {prop1: 'a', prop2: 'b', prop3: 'c'}

const pickAs = (obj, props) => 
  Object.entries(obj)
  .reduce((r, [k, v]) => {
    if(k in props) r[props[k]] = v;
  
    return r;
  }, {});
  
const result = pickAs(a, {prop1: 'first', prop3: 'second'});
console.log(result) // {first: 'a', second: 'c'}

Upvotes: 4

CRice
CRice

Reputation: 32166

You can use lodash _.mapKeys method to rename the keys after you've picked them from the object. As far as I know there's no method to do both at the same time, but this works quite well:

const a = {prop1: 'a', prop2: 'b', prop3: 'c'}

const result = _.mapKeys(_.pick(a, ["prop1", "prop3"]), (v, k) => k.endsWith("1") ? "first" : "second");
console.log(result);
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

You'll want to replace the mapKeys second argument with a function that fits your actual use case. That function is invoked with two arguments: the value and the key, and should return the new key that you want.

Upvotes: 0

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