1arr = [{x:1}, {x:3}]
2
3arr.reduce((accumulator, current) => accumulator + current.x, 0);
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
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}