CODEWITHSUNDEEP
javascriptlodash
Nat
Nat

Reputation: 487

Retrieve element from inner array in array using lodash

Is there a way to retrieve an element from inner array in array when using nested lodash find, for example?

I have an array of groups, each element of which has array of children. All children have unique ids (even between groups). I need to get hold of a child with id == value and now I'm doing the following:

  1. Firstly I retrieve needed group:

    var group = _(groups).find(g => {return _(g.children).find(c => {return c.id == value})});

  2. Then I get the child:

    var child = _(group.children).find(c => {return c.id == value});

Is there a more efficient and elegant way to achieve this?

Upvotes: 1

Views: 407

Answers (2)

stasovlas
stasovlas

Reputation: 7416

flat groups by children and find from result

_(groups)
    .flatMap('children')
    .find({id: value})
    .value();

Upvotes: 4

Parth Vyas
Parth Vyas

Reputation: 507

There is a another way of doing this using map() and filter()

var filteredArray = [];

_.map(group, function(groupValue) {
  var groupChildren = groupValue.children;
  var filteredChild = _.filter(groupChildren, function(child) {
    return child.id = value
  });
   if(filteredChild.length != 0) {
     filteredArray.push(filteredChild[0]);
     return groupValue;
   } else {
     return groupValue;
   }
});

Upvotes: 1

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