# Map

Creates a new `Option<T>` whose value is the result of applying the given `mapping` function to `Option<T>.Some` value.

Otherwise returns an `Option<T>.None`.

| Parameters                                               | Returns          |
| -------------------------------------------------------- | ---------------- |
| <p>Func\<T, TResult> mapping</p><p>Option\<T> option</p> | Option\<TResult> |

## Usage

This function is usually used to modify an optional value by applying a given regular function. For instance, With this method is possible to apply an function that receive an `int` to an `Option<int>`.

This function uses the `Match` method to get the encapsulated value by `Option<T>`, applies the `mapping` function and encapsulate the result.

&#x20;**When the option value IsSome**&#x20;

```csharp
Option<int> optionValue = 4;
Option<int> result = optionValue.Map(value => value * 2);

//result.IsSome = true
//result.Some = 8
```

&#x20;**When the option value IsSome and the Map function modifies its type**

```csharp
Option<int> optionValue = 4;
Option<string> result = optionValue.Map(value => value.ToString());

//result.IsSome = true
//result.Some = "4"
```

&#x20;**When the option value IsSome (with named function)**

```csharp
int SquareAndDouble(int value)
{
    return value * value * 2;
}

Option<int> optionValue = 4;
Option<int> result = optionValue.Map(SquareAndDouble);

//result.IsSome = true
//result.Some = 32
```

&#x20;**When the option value IsNone**&#x20;

```csharp
Option<int> optionValue = Option<int>.None();
Option<int> result = optionValue.Map(value => value * 2);

//result.IsSome = false
//result.IsNone = true
```


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