scala

# Function1

#### trait Function1[-T1, +R] extends AnyRef

A function of 1 parameter.

In the following example, the definition of succ is a shorthand for the anonymous class definition anonfun1:

object Main extends App {
val succ = (x: Int) => x + 1
val anonfun1 = new Function1[Int, Int] {
def apply(x: Int): Int = x + 1
}
assert(succ(0) == anonfun1(0))
}

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
(T1) ⇒ R
Annotations
( msg = ... )
Source
Function1.scala
Linear Supertypes
AnyRef, Any
Ordering
1. Alphabetic
2. By inheritance
Inherited
1. Function1
2. AnyRef
3. Any
Implicitly
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc
1. Hide All
2. Show all
Visibility
1. Public
2. All

### Abstract Value Members

1. #### abstract def apply(v1: T1): R

Apply the body of this function to the argument.

Apply the body of this function to the argument.

returns

the result of function application.

### Concrete Value Members

1. #### final def !=(arg0: Any): Boolean

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

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

Implicit information
This member is added by an implicit conversion from (T1) ⇒ R to any2stringadd[(T1) ⇒ R] performed by method any2stringadd in scala.Predef.
Definition Classes
4. #### def ->[B](y: B): ((T1) ⇒ R, B)

Implicit information
This member is added by an implicit conversion from (T1) ⇒ R to ArrowAssoc[(T1) ⇒ R] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc
Annotations
()
5. #### final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
6. #### def andThen[A](g: (R) ⇒ A): (T1) ⇒ A

Composes two instances of Function1 in a new Function1, with this function applied first.

Composes two instances of Function1 in a new Function1, with this function applied first.

A

the result type of function g

g

a function R => A

returns

a new function f such that f(x) == g(apply(x))

Annotations
()
7. #### final def asInstanceOf[T0]: T0

Definition Classes
Any
8. #### def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
( ... )
9. #### def compose[A](g: (A) ⇒ T1): (A) ⇒ R

Composes two instances of Function1 in a new Function1, with this function applied last.

Composes two instances of Function1 in a new Function1, with this function applied last.

A

the type to which function g can be applied

g

a function A => T1

returns

a new function f such that f(x) == apply(g(x))

Annotations
()
10. #### def ensuring(cond: ((T1) ⇒ R) ⇒ Boolean, msg: ⇒ Any): (T1) ⇒ R

Implicit information
This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
11. #### def ensuring(cond: ((T1) ⇒ R) ⇒ Boolean): (T1) ⇒ R

Implicit information
This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
12. #### def ensuring(cond: Boolean, msg: ⇒ Any): (T1) ⇒ R

Implicit information
This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
13. #### def ensuring(cond: Boolean): (T1) ⇒ R

Implicit information
This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
Definition Classes
Ensuring
14. #### final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
15. #### def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
16. #### def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
( classOf[java.lang.Throwable] )
17. #### 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 (T1) ⇒ R to StringFormat[(T1) ⇒ R] performed by method StringFormat in scala.Predef.
Definition Classes
StringFormat
Annotations
()
18. #### final def getClass(): Class[_]

Definition Classes
AnyRef → Any
19. #### def hashCode(): Int

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

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

Definition Classes
AnyRef
22. #### final def notify(): Unit

Definition Classes
AnyRef
23. #### final def notifyAll(): Unit

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

Definition Classes
AnyRef
25. #### def toString(): String

Definition Classes
Function1 → AnyRef → Any
26. #### final def wait(): Unit

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

Definition Classes
AnyRef
Annotations
( ... )
28. #### final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
( ... )
29. #### def →[B](y: B): ((T1) ⇒ R, B)

Implicit information
This member is added by an implicit conversion from (T1) ⇒ R to ArrowAssoc[(T1) ⇒ R] performed by method ArrowAssoc in scala.Predef.
Definition Classes
ArrowAssoc