Lære Loop Transformations: Reverse, Skip, and Filter | Advanced Looping: Patterns, Nesting, and Pitfalls

Transforming data with loops is a powerful skill in C#. You can use loops to reverse the order of elements in an array, skip over certain items, or filter elements that meet specific conditions. These techniques allow you to reshape data to fit your needs, whether you want to display information differently or process only the most relevant items.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] numbers = { 10, 20, 30, 40, 50 };
            Console.WriteLine("Original array:");
            foreach (int num in numbers)
            {
                Console.Write(num + " ");
            }
            Console.WriteLine();

            Console.WriteLine("Reversed array:");
            for (int i = numbers.Length - 1; i >= 0; i--)
            {
                Console.Write(numbers[i] + " ");
            }
            Console.WriteLine();
        }
    }
}

When you want to process only certain elements in a collection, filtering becomes essential. You can use an if statement inside a loop to check each element and decide whether to act on it. This is especially useful when you need to extract values that meet specific criteria, such as positive numbers, even values, or items above a threshold.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] numbers = { -3, 7, 0, 12, -8, 5 };
            Console.WriteLine("Positive numbers in the array:");
            for (int i = 0; i < numbers.Length; i++)
            {
                if (numbers[i] > 0)
                {
                    Console.Write(numbers[i] + " ");
                }
            }
            Console.WriteLine();
        }
    }
}

Loop transformations such as reversing, skipping, and filtering are common in data processing tasks. For example, you might reverse a list of recent transactions to display the most recent first, skip over invalid records in a dataset, or filter out only high-priority messages in a notification system. Mastering these patterns helps you handle real-world data more effectively and prepares you for more advanced programming challenges.

1. What is a common use case for reversing an array with a loop?

2. How can you skip elements in a loop based on a condition?

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Program.cs


              1234567891011121314151617181920212223242526
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] numbers = { 10, 20, 30, 40, 50 };
            Console.WriteLine("Original array:");
            foreach (int num in numbers)
            {
                Console.Write(num + " ");
            }
            Console.WriteLine();

            Console.WriteLine("Reversed array:");
            for (int i = numbers.Length - 1; i >= 0; i--)
            {
                Console.Write(numbers[i] + " ");
            }
            Console.WriteLine();
        }
    }
}

Program.cs


              12345678910111213141516171819202122
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] numbers = { -3, 7, 0, 12, -8, 5 };
            Console.WriteLine("Positive numbers in the array:");
            for (int i = 0; i < numbers.Length; i++)
            {
                if (numbers[i] > 0)
                {
                    Console.Write(numbers[i] + " ");
                }
            }
            Console.WriteLine();
        }
    }
}

1. What is a common use case for reversing an array with a loop?

2. How can you skip elements in a loop based on a condition?

Var alt klart?

Tak for dine kommentarer!

Sektion 3. Kapitel 3