Retrieve element from inner array in array using lodash

Question

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:

Firstly I retrieve needed group:

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

why lodash? native javascript (filter(), map(), etc) are not enough? — Alongkorn
– Alongkorn, Commented Nov 21, 2016 at 8:42

stasovlas · Accepted Answer · 2016-12-17 06:57:46Z

4

flat groups by children and find from result

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

edited Dec 17, 2016 at 6:57

answered Nov 21, 2016 at 9:50

stasovlas

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Comments

Parth Vyas · Accepted Answer · 2016-11-21 13:44:15Z

1

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;
   }
});

answered Nov 21, 2016 at 13:44

Parth Vyas

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