Type in expressions to have them evaluated.
Type :help for more information.
scala>
scala> :type List[1, 2, 3]
<console>:2: error: identifier expected but integer literal found.
List[1, 2, 3]
^
<console>:3: error: ']' expected but '}' found.
}
^
<console>:1: error: identifier expected but integer literal found.
List[1, 2, 3]
^
scala> :type List(1, 2, 3)
List[Int]
scala> :type def foo[T](x: T) = List(x)
[T](x: T)List[T]
scala> :type val bar = List(Set(1))
List[scala.collection.immutable.Set[Int]]
scala> :type lazy val bar = Set(Set(1))
scala.collection.immutable.Set[scala.collection.immutable.Set[Int]]
scala> :type def f[T >: Null, U <: String](x: T, y: U) = Set(x, y)
[T >: Null, U <: String](x: T, y: U)scala.collection.immutable.Set[Any]
scala> :type def x = 1 ; def bar[T >: Null <: AnyRef](xyz: T) = 5
=> Int <and> [T >: Null <: AnyRef](xyz: T)Int
scala>
scala> :type 5
Int
scala> :type val f = 5
Int
scala> :type lazy val f = 5
Int
scala> :type protected lazy val f = 5
<console>:2: error: illegal start of statement (no modifiers allowed here)
protected lazy val f = 5
^
<console>:5: error: lazy value f cannot be accessed in object $iw
Access to protected value f not permitted because
enclosing object $eval in package $line19 is not a subclass of
object $iw where target is defined
lazy val $result = `f`
^
scala> :type def f = 5
=> Int
scala> :type def f() = 5
()Int
scala>
scala> :type def g[T](xs: Set[_ <: T]) = Some(xs.head)
[T](xs: Set[_ <: T])Some[T]
scala>
scala> // verbose!
scala> :type -v List(1,2,3) filter _
// Type signature
(Int => Boolean) => List[Int]
// Internal Type structure
TypeRef(
TypeSymbol(abstract trait Function1[-T1, +R] extends Object)
args = List(
TypeRef(
TypeSymbol(abstract trait Function1[-T1, +R] extends Object)
args = List(
TypeRef(TypeSymbol(final class Int extends AnyVal))
TypeRef(TypeSymbol(final class Boolean extends AnyVal))
)
)
TypeRef(
TypeSymbol(
sealed abstract class List[+A] extends AbstractSeq[A] with LinearSeq[A] with Product with GenericTraversableTemplate[A,List] with LinearSeqOptimized[A,List[A]]
)
args = List(
TypeRef(TypeSymbol(final class Int extends AnyVal))
)
)
)
)
scala> :type -v def f[T >: Null, U <: String](x: T, y: U) = Set(x, y)
// Type signature
[T >: Null, U <: String](x: T, y: U)scala.collection.immutable.Set[Any]
// Internal Type structure
PolyType(
typeParams = List(TypeParam(T >: Null), TypeParam(U <: String))
resultType = MethodType(
params = List(TermSymbol(x: T), TermSymbol(y: U))
resultType = TypeRef(
TypeSymbol(
abstract trait Set[A] extends Iterable[A] with Set[A] with GenericSetTemplate[A,scala.collection.immutable.Set] with SetLike[A,scala.collection.immutable.Set[A]] with Parallelizable[A,scala.collection.parallel.immutable.ParSet[A]]
)
args = List(TypeRef(TypeSymbol(abstract class Any extends )))
)
)
)
scala> :type -v def x = 1 ; def bar[T >: Null <: AnyRef](xyz: T) = 5
// Type signature
=> Int <and> [T >: Null <: AnyRef](xyz: T)Int
// Internal Type structure
OverloadedType(
alts = List(
NullaryMethodType(
TypeRef(TypeSymbol(final class Int extends AnyVal))
)
PolyType(
typeParams = List(TypeParam(T >: Null <: AnyRef))
resultType = MethodType(
params = List(TermSymbol(xyz: T))
resultType = TypeRef(
TypeSymbol(final class Int extends AnyVal)
)
)
)
)
)
scala> :type -v Nil.combinations _
// Type signature
Int => Iterator[List[Nothing]]
// Internal Type structure
TypeRef(
TypeSymbol(abstract trait Function1[-T1, +R] extends Object)
args = List(
TypeRef(TypeSymbol(final class Int extends AnyVal))
TypeRef(
TypeSymbol(
abstract trait Iterator[+A] extends TraversableOnce[A]
)
args = List(
TypeRef(
TypeSymbol(
sealed abstract class List[+A] extends AbstractSeq[A] with LinearSeq[A] with Product with GenericTraversableTemplate[A,List] with LinearSeqOptimized[A,List[A]]
)
args = List(
TypeRef(
TypeSymbol(final abstract class Nothing extends Any)
)
)
)
)
)
)
)
scala> :type -v def f[T <: AnyVal] = List[T]().combinations _
// Type signature
[T <: AnyVal]=> Int => Iterator[List[T]]
// Internal Type structure
PolyType(
typeParams = List(TypeParam(T <: AnyVal))
resultType = NullaryMethodType(
TypeRef(
TypeSymbol(abstract trait Function1[-T1, +R] extends Object)
args = List(
TypeRef(TypeSymbol(final class Int extends AnyVal))
TypeRef(
TypeSymbol(
abstract trait Iterator[+A] extends TraversableOnce[A]
)
args = List(
TypeRef(
TypeSymbol(
sealed abstract class List[+A] extends AbstractSeq[A] with LinearSeq[A] with Product with GenericTraversableTemplate[A,List] with LinearSeqOptimized[A,List[A]]
)
args = List(TypeParamTypeRef(TypeParam(T <: AnyVal)))
)
)
)
)
)
)
)
scala> :type -v def f[T, U >: T](x: T, y: List[U]) = x :: y
// Type signature
[T, U >: T](x: T, y: List[U])List[U]
// Internal Type structure
PolyType(
typeParams = List(TypeParam(T), TypeParam(U >: T))
resultType = MethodType(
params = List(TermSymbol(x: T), TermSymbol(y: List[U]))
resultType = TypeRef(
TypeSymbol(
sealed abstract class List[+A] extends AbstractSeq[A] with LinearSeq[A] with Product with GenericTraversableTemplate[A,List] with LinearSeqOptimized[A,List[A]]
)
args = List(TypeParamTypeRef(TypeParam(U >: T)))
)
)
)
scala>
scala>
