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Tomas Svojanovsky
26,680 PointsWhy should I solve this way?
Hello, the task I need to solve sum of products over price 10.
I find my solution
const products = [
{ name: 'hard drive', price: 59.99 },
{ name: 'lighbulbs', price: 2.59 },
{ name: 'paper towels', price: 6.99 },
{ name: 'flatscreen monitor', price: 159.99 },
{ name: 'cable ties', price: 19.99 },
{ name: 'ballpoint pens', price: 4.49 },
];
const total = products
.reduce((sum, product) => {
if (product.price > 10) {
return sum + product.price;
}
return sum;
}, 0)
.toFixed(2);
I think my solution is faster, but with filter is cleaner.
3 Answers
Tom Geraghty
24,162 PointsLearning.
That's why.
Steven Parker
220,425 PointsContratulations, you re-invented "filter". 
But if you were going purely for efficiency, a good ol' "for" loop would be even better:
let sum = 0;
for (let i = 0; i < products.length; i++) {
if (products[i].price > 10) sum += products[i].price;
}
const total = sum.toFixed(2);
But the purpose of the exercise was not to write the fastest code, but to practice the use of these array methods.
Tomas Svojanovsky
26,680 PointsI was looking for best practices. It doesn't mean you can do it, you should do it.
Steven Parker
220,425 PointsI don't think the choice of method falls into the "best practices" category. Both ways do the job and the code is easy to read and maintain.