# Unit

> [`Tango.Types.Unit`](https://github.com/gabrielschade/Tango/blob/master/Tango/Tango/Types/Unit.cs)

The unit type is a type that indicates the absence of a specific value. The `Unit` type has only a single value, which acts as a placeholder when no other value exists or is needed.

The unit type resembles the void type in languages such as C# and C++. The value of the unit type is often used to hold the place where a value is required by the language syntax, but when no value is needed or desired, like in casts from action to functions that needs to return a value.

The concept behind this type can be find in the section: [Fundamentals > From void to Unit](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Concepts/From%20void%20to%20Unitv.html).

## Usage

You can create a Unit value normally like any struct.

```csharp
Unit unit = new Unit();
```

This struct have no properties or methods besides the shared operations presents in all structures: `Equals`, `GetHashCode`, `GetType` e `ToString`.

### Casts between `Action` and `Func`

Some high order functions needs a `Func` delegate in its parameters, it's is possible to create this delegate from an `Action` function by using [`ToFunction`](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Functional/FunctionExtensions.html).

Originally an `Action` delegate doesn't returns anything, because it has a `void` type as returns. At this point, **Tango** uses the `Unit` type to create a new function that doesn't return anything and can be represented by `Func` delegate as well.

The fundamentals about `Func` and `Action` can be find in [Fundamentals > Function and Action](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Concepts/Function%20and%20Action.html) section.


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