Get object with sum of positives and negatives numbers with ES6

reduce.js

// hints
// ES6 rest params
// arrow function
const sum = (...args) => 
    args.reduce((accu, value) => ({
        positive: value > 0 ? accu.positive + value: accu.positive,
        negative: value < 0 ? accu.negative + value: accu.negative,
    }), { positive: 0, negative: 0})
    
// tests

sum(-7, 53, 89, -80, 2, 84, -39, -38, 57 - 78);
// Object { positive: 228, negative: -185 }

sum()
// Object { positive: 0, negative: 0 }