Вы используете локальные переменные в LINQ и используете let? 👇
Ключевое слово let позволяет вводить временную переменную прямо внутри запроса LINQ — как локальную переменную в цикле.
Разбивайте сложные вычисления на части
Делайте запрос модульнее и чище
Меньше проходов по данным → выше производительность
👉 Простой пример: csharp
from order in orders let total = order.Items.Sum(i => i.Price * i.Quantity) where total > 1000 let categories = order.Items.Select(i => i.Category).Distinct() select new { OrderId = order.Id, Total = total, Categories = categories };
let total = … — вычисляем сумму заказа только один раз
where total > 1000 — фильтруем по готовому значению
let categories = … — собираем уникальные категории
Вы используете локальные переменные в LINQ и используете let? 👇
Ключевое слово let позволяет вводить временную переменную прямо внутри запроса LINQ — как локальную переменную в цикле.
Разбивайте сложные вычисления на части
Делайте запрос модульнее и чище
Меньше проходов по данным → выше производительность
👉 Простой пример: csharp
from order in orders let total = order.Items.Sum(i => i.Price * i.Quantity) where total > 1000 let categories = order.Items.Select(i => i.Category).Distinct() select new { OrderId = order.Id, Total = total, Categories = categories };
let total = … — вычисляем сумму заказа только один раз
where total > 1000 — фильтруем по готовому значению
let categories = … — собираем уникальные категории
Traders also expressed uncertainty about the situation with China Evergrande, as the indebted property company has not provided clarification about a key interest payment.In economic news, the Commerce Department reported an unexpected increase in U.S. new home sales in August.Crude oil prices climbed Friday and front-month WTI oil futures contracts saw gains for a fifth straight week amid tighter supplies. West Texas Intermediate Crude oil futures for November rose $0.68 or 0.9 percent at 73.98 a barrel. WTI Crude futures gained 2.8 percent for the week.
How Does Bitcoin Work?
Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”