final case class Failure[+T](exception: Throwable) extends Try[T] with Product with Serializable
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Type Members
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class
WithFilter extends AnyRef
We need a whole WithFilter class to honor the "doesn't create a new collection" contract even though it seems unlikely to matter much in a collection with max size 1.
We need a whole WithFilter class to honor the "doesn't create a new collection" contract even though it seems unlikely to matter much in a collection with max size 1.
- Definition Classes
- Try
- Annotations
- @deprecatedInheritance( message = ... , since = "2.12.0" )
Value Members
-
def
collect[U](pf: PartialFunction[T, U]): Try[U]
Applies the given partial function to the value from this
Success
or returns this if this is aFailure
. - val exception: Throwable
-
def
failed: Try[Throwable]
Inverts this
Try
. -
def
filter(p: (T) ⇒ Boolean): Try[T]
Converts this to a
Failure
if the predicate is not satisfied. -
def
flatMap[U](f: (T) ⇒ Try[U]): Try[U]
Returns the given function applied to the value from this
Success
or returns this if this is aFailure
. -
def
flatten[U](implicit ev: <:<[T, Try[U]]): Try[U]
Transforms a nested
Try
, ie, aTry
of typeTry[Try[T]]
, into an un-nestedTry
, ie, aTry
of typeTry[T]
. -
def
fold[U](fa: (Throwable) ⇒ U, fb: (T) ⇒ U): U
Applies
fa
if this is aFailure
orfb
if this is aSuccess
.Applies
fa
if this is aFailure
orfb
if this is aSuccess
. Iffb
is initially applied and throws an exception, thenfa
is applied with this exception.- fa
the function to apply if this is a
Failure
- fb
the function to apply if this is a
Success
- returns
the results of applying the function
-
def
foreach[U](f: (T) ⇒ U): Unit
Applies the given function
f
if this is aSuccess
, otherwise returnsUnit
if this is aFailure
. -
def
get: T
Returns the value from this
Success
or throws the exception if this is aFailure
. -
def
getOrElse[U >: T](default: ⇒ U): U
Returns the value from this
Success
or the givendefault
argument if this is aFailure
. -
def
isFailure: Boolean
Returns
true
if theTry
is aFailure
,false
otherwise. -
def
isSuccess: Boolean
Returns
true
if theTry
is aSuccess
,false
otherwise. -
def
map[U](f: (T) ⇒ U): Try[U]
Maps the given function to the value from this
Success
or returns this if this is aFailure
. -
def
orElse[U >: T](default: ⇒ Try[U]): Try[U]
Returns this
Try
if it's aSuccess
or the givendefault
argument if this is aFailure
. -
def
recover[U >: T](pf: PartialFunction[Throwable, U]): Try[U]
Applies the given function
f
if this is aFailure
, otherwise returns this if this is aSuccess
. -
def
recoverWith[U >: T](pf: PartialFunction[Throwable, Try[U]]): Try[U]
Applies the given function
f
if this is aFailure
, otherwise returns this if this is aSuccess
. -
def
toEither: Either[Throwable, T]
Returns
Left
withThrowable
if this is aFailure
, otherwise returnsRight
withSuccess
value. -
def
toOption: Option[T]
Returns
None
if this is aFailure
or aSome
containing the value if this is aSuccess
. -
def
transform[U](s: (T) ⇒ Try[U], f: (Throwable) ⇒ Try[U]): Try[U]
Completes this
Try
by applying the functionf
to this if this is of typeFailure
, or conversely, by applyings
if this is aSuccess
. -
final
def
withFilter(p: (T) ⇒ Boolean): WithFilter
Creates a non-strict filter, which eventually converts this to a
Failure
if the predicate is not satisfied.Creates a non-strict filter, which eventually converts this to a
Failure
if the predicate is not satisfied.Note: unlike filter, withFilter does not create a new Try. Instead, it restricts the domain of subsequent
map
,flatMap
,foreach
, andwithFilter
operations.As Try is a one-element collection, this may be a bit overkill, but it's consistent with withFilter on Option and the other collections.
- p
the predicate used to test elements.
- returns
an object of class
WithFilter
, which supportsmap
,flatMap
,foreach
, andwithFilter
operations. All these operations apply to those elements of this Try which satisfy the predicatep
.
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int
,Float
,Array
orOption
which are accessible in all Scala compilation units without explicit qualification or imports.Notable packages include:
scala.collection
and its sub-packages contain Scala's collections frameworkscala.collection.immutable
- Immutable, sequential data-structures such asVector
,List
,Range
,HashMap
orHashSet
scala.collection.mutable
- Mutable, sequential data-structures such asArrayBuffer
,StringBuilder
,HashMap
orHashSet
scala.collection.concurrent
- Mutable, concurrent data-structures such asTrieMap
scala.collection.parallel.immutable
- Immutable, parallel data-structures such asParVector
,ParRange
,ParHashMap
orParHashSet
scala.collection.parallel.mutable
- Mutable, parallel data-structures such asParArray
,ParHashMap
,ParTrieMap
orParHashSet
scala.concurrent
- Primitives for concurrent programming such asFutures
andPromises
scala.io
- Input and output operationsscala.math
- Basic math functions and additional numeric types likeBigInt
andBigDecimal
scala.sys
- Interaction with other processes and the operating systemscala.util.matching
- Regular expressionsOther packages exist. See the complete list on the right.
Additional parts of the standard library are shipped as separate libraries. These include:
scala.reflect
- Scala's reflection API (scala-reflect.jar)scala.xml
- XML parsing, manipulation, and serialization (scala-xml.jar)scala.swing
- A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)scala.util.parsing
- Parser combinators (scala-parser-combinators.jar)Automatic imports
Identifiers in the scala package and the
scala.Predef
object are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
List
is an alias forscala.collection.immutable.List
.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
String
is an alias forjava.lang.String
.