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
Jonathan Grieve
Treehouse Moderator 91,253 PointsOkay, one more time....
Okay....
I seem to have successfully flattened the array but they're all coming up undefined. I've been at this for an hour (I can be quite stubborn)
I'm trying to access the nested hobbies property. What am I getting wrong? Thanks :)
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.hobbies.map(hobby => hobby.hobbies))
.reduce((arr, hobbies) => [ ...arr, ...hobbies ], []);
console.log(hobbies);
2 Answers
Matt Brock
28,330 PointsHey man, I got it working using a single .map() and the .concat() method inside the .reduce().
hobbies = customers
.map(customer => customer.personal.hobbies)
.reduce((mainArr, customerArr) => mainArr.concat( customerArr ), []);
Charles Tinley
8,012 Pointshobbies= customers .map(customer => customer.personal.hobbies) .reduce((mainArr, customerArr)=> [...mainArr, ...customerArr], []);