sum of array of objects javascript
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: 461Sum of Array of Objects in JavaScript
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'));Copyright © 2021 Codeinu
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