Maybe Monad

Creates a Maybe monad instance which can be used with the flatMap operator %>>=%. See the Monads in R vignette for more details.

This container, when flatMapped, always returns a value, either of type Nothing (if an error was raised or the result was NULL), or Just.

See also

Nothing(), is_nothing(), Just(), is_just()

Public fields

value

value contained in the instance

Methods

Public methods

• Maybe$new()

• Maybe$bind()

• Maybe$clone()

---

Method new()

create a new Maybe instance

Usage

Maybe$new(value)

Arguments

value

value to be contained

Returns

a new Maybe instance

---

Method bind()

bind when using flatMap (%>>=%)

Usage

Maybe$bind(f, expr)

Arguments

f

function to apply

expr

expression of the function

---

Method clone()

The objects of this class are cloneable with this method.

Usage

Maybe$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.