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JavaScript JavaScript Array Iteration Methods Combining Array Methods Nested Data

Remi Banjoko
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Remi Banjoko
Front End Web Development Techdegree Graduate 14,721 Points

I'm trying to figure out how to access the values nested in the array of objects

app.js
const customers = [
  {
    name: "Tyrone",
    personal: {
      age: 33,
      hobbies: ["Bicycling", "Camping"]
    }
  },
  {
    name: "Elizabeth",
    personal: {
      age: 25,
      hobbies: ["Guitar", "Reading", "Gardening"]
    }
  },
  {
    name: "Penny",
    personal: {
      age: 36,
      hobbies: ["Comics", "Chess", "Legos"]
    }
  }
];
let hobbies;

// hobbies should be: ["Bicycling", "Camping", "Guitar", "Reading", "Gardening", "Comics", "Chess", "Legos"]
// Write your code below

hobbies = customers
          .map( customer => [customer.hobbies])
          .reduce((arr, hobby) => [...arr, ...hobby], []);

1 Answer

Steven Parker
Steven Parker
217,573 Points

You're close, but the hobbies are not direct attributes of the customer, they are at a level below "personal". And they are already lists, so they don't need to be re-encapsulated as they are extracted:

          .map( customer => customer.personal.hobbies)