Sum of Array of Objects in JavaScript

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answered on April 29, 2020 Popularity 9/10 Helpfulness 3/10

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Sum of Array of Objects in JavaScript

Comment

class fruitCollection extends Array {
    sum(key) {
        return this.reduce((a, b) => a + (b[key] || 0), 0);
    }
}
const fruit = new fruitCollection(...[
    {  description: 'orange', Amount: 50},
    {  description: 'orange', Amount: 50},
    {  description: 'apple', Amount: 75},
    {  description: 'kiwi', Amount: 35},
    {  description: 'watermelon', Amount: 25 },]);

console.log(fruit.sum('Amount'));

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Source: www.delftstack.com

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Contributed on Nov 07 2021

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sum of array of objects javascript

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var accounts = [
  { name: 'James Brown', msgCount: 123 },
  { name: 'Stevie Wonder', msgCount: 22 },
  { name: 'Sly Stone', msgCount: 16 },
  { name: 'Otis Redding', msgCount: 300 }  // Otis has the most messages
];

// get sum of msgCount prop across all objects in array
var msgTotal = accounts.reduce(function(prev, cur) {
  return prev + cur.msgCount;
}, 0);

console.log('Total Messages:', msgTotal); // Total Messages: 461

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Source: Grepper

Tags: javascript j

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Contributed on May 11 2021

Philan ISithembiso

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javascript sum array of objects

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arr = [{x:1}, {x:3}]

arr.reduce((accumulator, current) => accumulator + current.x, 0);

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Source: Grepper

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Contributed on Apr 29 2020

Bhishma'S

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js get sum of array of objects

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const getSumByKey = (arr, key) => {
  return arr.reduce((accumulator, current) => accumulator + Number(current[key]), 0)
}

arr = [{x:1}, {x:3}]
getSumByKey(arr, 'x') // returns 4

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Contributed on Jun 04 2021

Defiant Dragonfly

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javascript sum of number in object array

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  run.addEventListener("click", function () {
    let sum = people.reduce(function (a, b) { // function(previousValue, currentValue)
      return {
        age: a.age + b.age, //select age in object array
      };
    });
    console.log(sum); //output sum of ages
  });

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Contributed on Oct 09 2020

Rocket Noob

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sum an array of objects

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-1

let cart = [
  {
    name: "JavaScript book",
    price: 4,
  },
  {
    name: "UGG Women's Hazel Ankle Boot",
    price: 79,
  },
  {
    name: "OXO Good Grips 11-Inch Balloon Whisk",
    price: 9,
  },
];

// totalPrice is 92

let totalPrice = cart.reduce(function (accumulator, item) {
  return accumulator + item.price;
}, 0);

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Source: sebhastian.com

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Contributed on May 20 2022

Shibu Sarkar

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javascript object array sum of values in object

Comment

const fruitTally = fruit.reduce((currentTally, currentFruit) => {
  currentTally[currentFruit] = (currentTally[currentFruit] || 0) + 1 
  return currentTally
} , {})
// returns {"apple":3,"banana":3,"cherry":2,"mango":2,"apricot":1,"guava":2}

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Source: blog.nona.digital

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Contributed on Aug 12 2020

Selfish Snake

0 Answers Avg Quality 2/10

sum same items values array of objects javascript

Comment

const fruits = [
  {
    type: "oranges",
    amount: 10,
  },
  {
    type: "apples",
    amount: 0,
  },
  {
    type: "oranges",
    amount: 5,
  },
];

const endresult = Array.from(
  fruits
    .reduce((map, curr) => {
      if (!map.has(curr.type)) map.set(curr.type, { ...curr, count: 1 });
      else {
        map.get(curr.type).amount += curr.amount;
        map.get(curr.type).count++;
      }
      return map;
    }, new Map())
    .values()
);

console.log(endresult);

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Contributed on Jun 20 2024

Grieving Gharial

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Sum of Array of Objects in JavaScript

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