Remove duplicate object copies from array of objects

Question

I have an array of objects that I get from an API. The property names are dynamic (meaning I don't have an extensive list of all of them). How can I get an array of all distinct objects? The contract specifies that if key is equal value is also equal. I tried to look around but I found nothing quite like this problem.

[                                                                                                                                                                                           20:31:28
  {
    'product-management': 'Product management'
  },
  {
    'product-development': 'Product development'
  },
  {
    'client-work': 'Client work'
  },
  {
    'client-work': 'Client work'
  },
  {
    'product-development': 'Product development'
  },
  {
    'client-work': 'Client work'
  },
  {
    'product-development': 'Product development'
  }
]

I would suggest using a different structure, with {key: '…', value: '…' }-shaped objects. — Bergi
– Bergi, Commented Dec 22, 2019 at 22:41
Sure you can. Even if the API responds with this weird JSON, you can still transform it into something more sane locally. — Bergi
– Bergi, Commented Dec 22, 2019 at 22:45

Ori Drori · Accepted Answer · 2019-12-22 22:52:56Z

Spread the array into Object.assign() to merge all objects to a single one. Since all objects properties are unique, this will leave only one key (and value) from the duplicates. Then convert to [key, value] pairs with Object.entries(), and map back to individual objects:

const data = [{"product-management":"Product management"},{"product-development":"Product development"},{"client-work":"Client work"},{"client-work":"Client work"},{"product-development":"Product development"},{"client-work":"Client work"},{"product-development":"Product development"}]

const result = Object.entries(Object.assign({}, ...data))
  .map(([k, v]) => ({ [k]: v }))
  
console.log(result)

Going with @Bergi's suggestion, you can also convert this to a saner API while removing duplicates:

const data = [{"product-management":"Product management"},{"product-development":"Product development"},{"client-work":"Client work"},{"client-work":"Client work"},{"product-development":"Product development"},{"client-work":"Client work"},{"product-development":"Product development"}]

const result = Object.entries(Object.assign({}, ...data))
  .map(([key, value]) => ({ key, value }))
  
console.log(result)

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