showing results for - "javascript object array sum of values in object"
Alma
09 Sep 2020
1arr = [{x:1}, {x:3}]
2
3arr.reduce((accumulator, current) => accumulator + current.x, 0);
Sofie
28 Jan 2021
1var accounts = [
2  { name: 'James Brown', msgCount: 123 },
3  { name: 'Stevie Wonder', msgCount: 22 },
4  { name: 'Sly Stone', msgCount: 16 },
5  { name: 'Otis Redding', msgCount: 300 }  // Otis has the most messages
6];
7
8// get sum of msgCount prop across all objects in array
9var msgTotal = accounts.reduce(function(prev, cur) {
10  return prev + cur.msgCount;
11}, 0);
12
13console.log('Total Messages:', msgTotal); // Total Messages: 461
Natalia
20 Jul 2018
1const fruitTally = fruit.reduce((currentTally, currentFruit) => {
2  currentTally[currentFruit] = (currentTally[currentFruit] || 0) + 1 
3  return currentTally
4} , {})
5// returns {"apple":3,"banana":3,"cherry":2,"mango":2,"apricot":1,"guava":2}
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