# My basic understanding of C# generics

Generic means a characteristic of or relating to a class or group of things; not specific, common, or general (Oxford Languages). In terms of C#, generic means not specific to a distinct data type.

Think of generics as a lunchbox, your lunchbox can hold different foods at different times. Meaning, your lunchbox is the class and the foods are the data types. This can be described as having a flexible container that can hold different data types, like strings, ints or even a custom type.

A generic class is written similar to the example below:

```csharp
public class Lunchbox<T>
{
    ...
}
```

You would then build this class up with its properties, constructors and methods:

```csharp
public class Lunchbox<T>
{
    // Properties
    private T lunchItem;

    // Constructors
    public Lunchbox(T newlunchItem)
    {
        lunchItem = newlunchItem;
    }
    
    // Methods
    public T GetLunchItem
    {
        return lunchItem
    }
}
```

Then in your main program, you would create a collection to store these various lunchbox foods:

```csharp
class Program
{
    static void Main()
    {
        // Create a Lunchbox for sandwiches (string)
        Lunchbox<string> sandwichLunchbox = new Lunchbox<string>("BLT", "Chicken and Stuffing", "Ham and Cheese");

        // Get the items from the lunchbox
        string sandwich = sandwichLunchbox.GetLunchItem();
        
        // Display the items from the lunchbox
        Console.WriteLine("Sandwich: " + sandwich);
    }
}
```

### Why use generics?

Reusability: It is reusable because you don't need a different class for each data type, the generic class allows for different inputs.

Safety: When you specify the data type you intend to use, you can only use this type of input. If you define a string for example, but input an int, a compile-time error will occur because it expects the defined type of string.

Flexibility: Generics are very flexible because they can adapt to various data types, even custom types.

### References

* [https://www.tutorialsteacher.com/csharp/csharp-generics](https://www.tutorialsteacher.com/csharp/csharp-generics)
    
* [https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/types/generics](https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/types/generics)
    
* [https://www.geeksforgeeks.org/c-sharp-generics-introduction/](https://www.geeksforgeeks.org/c-sharp-generics-introduction/)