array-length

HackerRank – Zig Zag Sequence solution

by

In this article, I’ll explain the Zig Zag Sequence algorithm problem on HackerRank. Problem statement: You’re given an integer array with an odd number of elements (ex: [5, 2, 3, 1, 4]). You need to re-arrange the elements so they’re in a zig zag sequence, which means: Here’s a diagram to help you visualize what … Read more

C# – Using top-level statements

by

The top-level statements feature makes the Main() method implicit. This feature was added in C# 9 (.NET 5) with the purpose of decluttering a project’s entry point. Here’s what a console app looks like using a top-level statement: The compiler generates the Main() method implicitly from the top-level statements. The code above is functionally equivalent … Read more

C# – Parsing commands and arguments in a console app

by

In a console app there are two ways to get commands: After getting a command, you have to parse it to figure out what code to execute. Typically commands have the following format: commandName -argumentName argumentValue. For example, take a look at this familiar git command: This is passing the command line arguments into the … Read more

C# – How to create a custom exception

by

To create a custom exception, create a subclass of the Exception class, like this: Then throw it just like you would any other exception, like this: It’s a good idea to call the base constructor from your constructor and pass in your custom error message. If this exception is unhandled, or if you are logging … Read more

C# – Hex string to byte array

by

This article shows code for converting a hex string to a byte array, unit tests, and a speed comparison. First, this diagram shows the algorithm for converting a hex string to a byte array. To convert a hex string to a byte array, you need to loop through the hex string and convert two characters … Read more