Always

cats.Always

See theAlways companion object

final class Always[A](f: () => A) extends Leaf[A]

Construct a lazy Eval[A] instance.

This type can be used for "lazy" values. In some sense it is equivalent to using a Function0 value.

This type will evaluate the computation every time the value is required. It should be avoided except when laziness is required and caching must be avoided. Generally, prefer Later.

Attributes

Companion: object
Source: Eval.scala
Graph
Supertypes: class Leaf[A]

class Eval[A]

trait Serializable

class Object

trait Matchable

class Any
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Members list

Value members

Concrete methods

Ensure that the result of the computation (if any) will be memoized.

Practically, this means that when called on an Always[A] a Later[A] with an equivalent computation will be returned.

Attributes

Source: Eval.scala

Evaluate the computation and return an A value.

For lazy instances (Later, Always), any necessary computation will be performed at this point. For eager instances (Now), a value will be immediately returned.

Attributes

Source: Eval.scala

Inherited methods

Lazily perform a computation based on an Eval[A], using the function f to produce an Eval[B] given an A.

This call is stack-safe -- many .flatMap calls may be chained without consumed additional stack during evaluation. It is also written to avoid left-association problems, so that repeated calls to .flatMap will be efficiently applied.

Computation performed in f is always lazy, even when called on an eager (Now) instance.

Attributes

Inherited from:: Eval
Source: Eval.scala

Transform an Eval[A] into an Eval[B] given the transformation function f.

This call is stack-safe -- many .map calls may be chained without consumed additional stack during evaluation.

Computation performed in f is always lazy, even when called on an eager (Now) instance.

Attributes

Inherited from:: Eval
Source: Eval.scala

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