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Jonathan Grieve
Treehouse Moderator 91,252 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], []);