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Rachel Heneault
12,401 PointsThe reduce method and the nested methods confused me the most in the entire course. I am stuck on the last challenge.
in the console I keep getting item is not iterable... hobbies = customers.reduce((accumulator, currentValue) => [...accumulator, ...currentValue.hobbies]);
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.reduce((accumulator, currentValue) => [...accumulator, ...currentValue.hobbies]);
2 Answers
Steven Parker
231,275 PointsOddly, I got a different error message: "Bummer: accumulator[Symbol.iterator] is not a function". But your error makes more sense, as a "customer" object isn't iterable (and so the spread operator won't work on it).
But you're really close. I see two issues:
- the "reduce" function needs a second argument to initialize the accumulator as an empty array
- the "customer" object has no "hobbies" property — but it has a "personal" which has a "hobbies"
Hermanos Solis Utrilla
18,184 PointsHope this works for you:
hobbies = customers.map(customer => customer.personal)
.reduce((accum, current) => [...accum, ...current.hobbies], []);
Steven Parker
231,275 Points