Lodash set every element of an array

Question

Is there a way to use the string notation in the _.set method to match all items in a nested array?

(e.g. hopefully similar to MongoDB's positional all operator)

const doc = {
  nested: [{a: 1}, {a: 2}, {a: 3}]
}

_.set(doc, "nested.$[].a", 5)

// console.log(doc)
// {
//   nested: [{a : 5}, {a: 5}, {a: 5}]
// }

I don't think there is any inbuild function in lodash. you have to use loop for this — Kiran Shinde
– Kiran Shinde, Commented May 4, 2020 at 9:55

th3n3wguy · Accepted Answer · 2020-05-04 14:42:13Z

1

No, you can't set every element in a nested array with the .set() method, but you can do this instead:

const doc = {
  nested: [{a: 1}, {a: 2}, {a: 3}]
}

// Your attempt.
// _.set(doc, "nested.$[].a", 5)

// Just use a .map() with .assign() instead.
const doc2 = _.assign({}, doc, {
  nested: _.map(doc.nested, (obj) => _.assign({}, obj, { a: 5 }))
});

console.log(doc2)
// {
//   nested: [{a : 5}, {a: 5}, {a: 5}]
// }

<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

answered May 4, 2020 at 14:42

th3n3wguy

3,7242 gold badges25 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Lodash set every element of an array

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related