Function0

A function of 0 parameters.

In the following example, the definition of javaVersion is a shorthand for the anonymous class definition anonfun0:

 object Main extends App {
   val javaVersion = () => sys.props("java.version")

   val anonfun0 = new Function0[String] {
     def apply(): String = sys.props("java.version")
   }
   assert(javaVersion() == anonfun0())
}

Note that Function1 does not define a total function, as might be suggested by the existence of scala.PartialFunction. The only distinction between Function1 and PartialFunction is that the latter can specify inputs which it will not handle.

Self Type: () ⇒ R
Source: Function0.scala

Linear Supertypes

AnyRef, Any

Known Subclasses

AbstractFunction0, PhantomReference, Reference, ReferenceWrapper, SoftReference, WeakReference

Type Hierarchy Learn more about scaladoc diagrams

Abstract Value Members

abstract def apply(): R

Apply the body of this function to the arguments.
Apply the body of this function to the arguments.
returns
the result of function application.

Concrete Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

Definition Classes
AnyRef → Any
def +(other: String): String

Implicit information
This member is added by an implicit conversion from () ⇒ R to any2stringadd[() ⇒ R] performed by method any2stringadd in scala.Predef.
Definition Classes
any2stringadd
def ->[B](y: B): (() ⇒ R, B)

Implicit information
This member is added by an implicit conversion from () ⇒ R to ArrowAssoc[() ⇒ R] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
@inline()
final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
def ensuring(cond: (() ⇒ R) ⇒ Boolean, msg: ⇒ Any): () ⇒ R

Implicit information
This member is added by an implicit conversion from () ⇒ R to Ensuring[() ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: (() ⇒ R) ⇒ Boolean): () ⇒ R

Implicit information
This member is added by an implicit conversion from () ⇒ R to Ensuring[() ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean, msg: ⇒ Any): () ⇒ R

Implicit information
This member is added by an implicit conversion from () ⇒ R to Ensuring[() ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
def ensuring(cond: Boolean): () ⇒ R

Implicit information
This member is added by an implicit conversion from () ⇒ R to Ensuring[() ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
def formatted(fmtstr: String): String

Returns string formatted according to given format string.
Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

Implicit information
This member is added by an implicit conversion from () ⇒ R to StringFormat[() ⇒ R] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
@inline()
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String

Definition Classes
Function0 → AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
def →[B](y: B): (() ⇒ R, B)

Implicit information
This member is added by an implicit conversion from () ⇒ R to ArrowAssoc[() ⇒ R] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc

trait Function0[+R] extends AnyRef

Abstract Value Members

abstract def apply(): R

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

def +(other: String): String

def ->[B](y: B): (() ⇒ R, B)

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

def ensuring(cond: (() ⇒ R) ⇒ Boolean, msg: ⇒ Any): () ⇒ R

def ensuring(cond: (() ⇒ R) ⇒ Boolean): () ⇒ R

def ensuring(cond: Boolean, msg: ⇒ Any): () ⇒ R

def ensuring(cond: Boolean): () ⇒ R

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

def formatted(fmtstr: String): String

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

def →[B](y: B): (() ⇒ R, B)

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from () ⇒ R to any2stringadd[() ⇒ R]

Inherited by implicit conversion StringFormat from () ⇒ R to StringFormat[() ⇒ R]

Inherited by implicit conversion Ensuring from () ⇒ R to Ensuring[() ⇒ R]

Inherited by implicit conversion ArrowAssoc from () ⇒ R to ArrowAssoc[() ⇒ R]

Ungrouped