How can I use Lodash/JS to recursively filter nested objects?

Question

I have an array with objects of unknown depth, like this

var objects = [{
    id: 1,
    name: 'foo'
}, {
    id: 2,
    name: 'bar',
    childs: [{
        id: 3,
        name: 'baz',
        childs: [{
            id: 4,
            name: 'foobar'
        }]
    }]
}];

I would like to be able to filter a specific child object by it's id.

Currently I am using this little lodash script (referred from this question) but it works only with objects not deeper than one level. So searching for id: 1 and id: 2 would work fine while searching for id: 3 or id: 4 would return undefined.

function deepFilter(obj, search) {
    return _(obj)
        .thru(function(coll) {
            return _.union(coll, _.map(coll, 'children'));
        })
        .flatten()
        .find(search);
}

A little JSfiddle.

Answer 1

You could take an iterative and recursive approach.

function find(id, array) {
    var result;
    array.some(o => o.id === id && (result = o) || (result = find(id, o.children || [])));
    return result;
}

var objects = [{ id: 1, name: 'foo' }, { id: 2, name: 'bar', children: [{ id: 3, name: 'baz', children: [{ id: 4, name: 'foobar' }] }] }];

console.log(find(1, objects));
console.log(find(2, objects));
console.log(find(3, objects));
console.log(find(4, objects));

.as-console-wrapper { max-height: 100% !important; top: 0; }