Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript Array Iteration Methods Combining Array Methods Nested Data

Bogdan-Adrian Cornea
Bogdan-Adrian Cornea
9,347 Points
Posted by Bogdan-Adrian Cornea
Bogdan-Adrian Cornea
9,347 Points

Can anyone help me understand what i'm doing wrong?

I tried to use map and reduce, but i'm getting error every time. can anyone help me?

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.personal.map(hobby => hobby.hobbies))
  .reduce((arr, customerHobby) => [...arr, ...customerHobby],[]);

console.log(hobbies);
Bogdan-Adrian Cornea
Bogdan-Adrian Cornea
9,347 Points
Bogdan-Adrian Cornea
Bogdan-Adrian Cornea
9,347 Points

Nvm, i solved it after 1 h.

i use the following code

hobbies = customers

.map (function (hobby) {
return hobby.personal.hobbies; // return 3 array only with hobby;
}) .reduce((arr, hobbyList) => [...arr,...hobbyList], []);

console.log(hobbies);

Hope it will help