C# Tricks

Readonly Structs for Immutable Data Types

Readonly structures are ideal for creating immutable data types. This means that once an object is created, it cannot be changed.

public readonly struct Point
{
    public double X { get; }
    public double Y { get; }
    
    public Point(double x, double y) => (X, Y) = (x, y);
}

Ref Returns and Locals for Performance Optimization

Ref returns and locals allow methods to return references to variables, instead of the values themselves. This can significantly improve performance for large objects.

public ref int Find(int[] numbers, int target)
{
    for (int i = 0; i < numbers.Length; i++)
    {
        if (numbers[i] == target)
            return ref numbers[i];
    }
    throw new IndexOutOfRangeException("Not found");
}