Using reduce to sum the price of objects in an array

Question

I have an array of objects that have a price property, and I'm trying to sum all the prices in the object. I think what's tripping me up is that it's an array of objects so I'm having a hard time accessing the price property.

Here's what's displaying in the console: 0[object Object][object Object][object Object][object Object][object Object][object Object][object Object]

Here's my code:

const items = [
    { name: 'Bike', price: 100 },
    { name: 'TV', price: 200 },
    { name: 'Album', price: 10 },
    { name: 'Book', price: 5 },
    { name: 'Phone', price: 500 },
    { name: 'Computer', price: 1000 },
    { name: 'Keyboard', price: 25 }
];
const totalPrice = items.reduce((total, curVal) => {
    return total + curVal;
}, 0);

use total + curVal.price, since curVal is an object with a property named price - or, items.reduce((total, {price:curVal}) => { without changing the rest of the code — Jaromanda X
– Jaromanda X, Commented Apr 11, 2020 at 0:57

Unmitigated · Accepted Answer · 2020-04-11 01:29:35Z

1

You were almost there!

const items = [
    { name: 'Bike', price: 100 },
    { name: 'TV', price: 200 },
    { name: 'Album', price: 10 },
    { name: 'Book', price: 5 },
    { name: 'Phone', price: 500 },
    { name: 'Computer', price: 1000 },
    { name: 'Keyboard', price: 25 }
];
const totalPrice = items.reduce((a, b)=> a + b.price,0);
console.log(totalPrice);

edited Apr 11, 2020 at 1:29

Unmitigated

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answered Apr 11, 2020 at 1:01

djcaesar9114

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Comments

Hien Nguyen · Accepted Answer · 2020-04-11 01:02:33Z

0

Because curVal is object, you need use price property by curVal.price

const items = [
    { name: 'Bike', price: 100 },
    { name: 'TV', price: 200 },
    { name: 'Album', price: 10 },
    { name: 'Book', price: 5 },
    { name: 'Phone', price: 500 },
    { name: 'Computer', price: 1000 },
    { name: 'Keyboard', price: 25 }
];
const totalPrice = items.reduce((total, curVal) => {
    return total + curVal.price;
}, 0);

console.log(totalPrice);

answered Apr 11, 2020 at 1:02

Hien Nguyen

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Comments

Ninad Bondre · Accepted Answer · 2020-04-11 01:10:29Z

0

const items = [
  { name: "Bike", price: 100 },
  { name: "TV", price: 200 },
  { name: "Album", price: 10 },
  { name: "Book", price: 5 },
  { name: "Phone", price: 500 },
  { name: "Computer", price: 1000 },
  { name: "Keyboard", price: 25 },
];

let sum = 0;
items.forEach((el) => {
  sum += el.price;
});
console.log(sum);

explanation - we set sum initially to zero then we will loop through the array using foreach and access price property using el.price and calculate the sum

answered Apr 11, 2020 at 1:10

Ninad Bondre

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