String of Digits
A popular task is to check if a string contains only digits. For example, you need to check if the user entered the correct phone number, index or a tax code of an organization. There are several ways to solve this task, which differ in their efficiency. Let's take a look at the most popular ones.
Any() vs Count: part 2
In Part 1, we compared Any() and Count methods for different collections and proposed optimization approaches.
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