Bind

Creates a new Option<T> whose value is the result of applying the given binder function to Option<T>.Some value when option IsSome.

Otherwise returns an Option<T>.None().

Parameters	Returns
Func<T, Option<TResult>> binder Option<T> option	Option<TResult>

Como usar

This function is usually used to modify an option value by using an function that receive a regular value and returns an optional.

It works like a Map function, but in this case the function returns an option value.

When the option value IsSome and binder returns IsSome

Option<int> SquareWhenEven(int value)
{
    if(element % 2 == 0)
        return value * value;
    else
        return Option<int>.None();
}

Option<int> optionValue = 4;
Option<int> result = optionValue.Bind(SquareWhenEven);

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

When the option value IsSome and binder returns IsNone

Option<int> SquareWhenEven(int value)
{
    if(element % 2 == 0)
        return value * value;
    else
        return Option<int>.None();
}

Option<int> optionValue = 5;
Option<int> result = optionValue.Bind(SquareWhenEven);

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

When the option value IsNone

Option<int> SquareWhenEven(int value)
{
    if(element % 2 == 0)
        return value * value;
    else
        return Option<int>.None();
}

Option<int> optionValue = Option<int>.None();
Option<int> result = optionValue.Bind(SquareWhenEven);

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