Merge unique values to array from array of arrays

Question

I have array like this:

[
  [
    {id:1, name:'xxx'}
  ],
  [
    {id:2, name:'xxx'},
    {id:1, name:'xxx'}
  ],
  [
    {id:2, name:'xxx'},
    {id:1, name:'xxx'},
    {id:3, name:'xxx'}
  ]
]

I need pick just objects with unique id and merge them into one array. Each object has id property, so I tried this:

_.(data).union().uniqBy(o => o.id).value()

but it gives me wrong result.

My required output should be like this:

[{id:1, name:'xxx'}, {id:2, name:'xxx'}, {id:3, name:'xxx'}]

Can you help me with that? Thanks.

Would _.uniqBy(_.flattenDeep(data), "id") do what you're wanting? — CRice
– CRice, Commented Mar 20, 2018 at 17:49

Ori Drori · Accepted Answer · 2018-03-20 18:35:37Z

1

Use _.flatten() to merge the sub arrays into a single array and then apply _.uniqBy():

const data = [[{"id":1,"name":"xxx"}],[{"id":2,"name":"xxx"},{"id":1,"name":"xxx"}],[{"id":2,"name":"xxx"},{"id":1,"name":"xxx"},{"id":3,"name":"xxx"}]];

const result = _(data)
  .flatten()
  .uniqBy('id')
  .value();
  
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js"></script>

answered Mar 20, 2018 at 18:35

Ori Drori

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