Better way to handle Arrays concatenation placed inside the Object

Question

Well, I need to make an array concatenation, placed inside the Object.

So the worked solution I've made is:

      const usersList = {
        tester: [{ id: 1, //... }, //...],
        custumers: [{ id: 1, //... }, //...],
        admin: [{ id: 1, //... }, //...]
      }

      let allUsers = []

      Object.keys(usersList).forEach(listKey => {
        allUsers = [
          ...allUsers,
          ...usersList[listKey]
        ]
      })

      return allUsers

Besides, I wonder perhaps there is present a much fashionable way to deal with such a case? I tried this one, but it doesn't work:

[...Object.keys(usersList).map(listKey => usersList[listKey])]

CertainPerformance · Accepted Answer · 2020-03-24 06:13:06Z

3

Take the object's values, which will give you an array of arrays, then flatten:

const allUsers = Object.values(usersList).flat();

If you can't use .flat, then:

const allUsers = [].concat.apply(...Object.values(usersList));

answered Mar 24, 2020 at 6:13

CertainPerformance

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Siva Kondapi Venkata · Accepted Answer · 2020-03-24 07:38:32Z

0

Another way is to use flatMap

const usersList = {
  tester: [{ id: 1 }],
  custumers: [{ id: 1 }],
  admin: [{ id: 1 }]
};

const res = Object.values(usersList).flatMap(x => x);

console.log(res);

answered Mar 24, 2020 at 7:38

Siva Kondapi Venkata

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