Namespace Option

This package provides an optional value Option<T>, which is either Some or None. Some contains a value, and None does not.

There is a number of use cases about Option:

  • Nullable value
  • Lazy initialized value
  • Optional parameter
  • Return value for showing that there are no meaningful value to report error
  • Optional field of an object

Index

Interfaces

OptionHkt

Type Aliases

None Option Some

Variables

applicative errorMonad functor monad partialEqUnary traversable traversableMonad

Functions

and andThen apply cmp contains dec enc eq equality filter flatMap flatten foldR fromPredicate ifNone ifSome isNone isNoneOr isSome isSomeAnd map mapOr mapOrElse monoid none okOr okOrElse optResToResOpt or orElse ord partialCmp partialEq partialEquality partialOrd some toArray toString traverse unwrap unwrapOr unwrapOrElse unzip xor zip zipWith

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