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scala

Predef

object Predef extends LowPriorityImplicits with DeprecatedPredef

The Predef object provides definitions that are accessible in all Scala compilation units without explicit qualification.

Commonly Used Types

Predef provides type aliases for types which are commonly used, such as the immutable collection types scala.collection.immutable.Map, scala.collection.immutable.Set, and the scala.collection.immutable.List constructors (scala.collection.immutable.:: and scala.collection.immutable.Nil).

Console Output

For basic console output, Predef provides convenience methods print and println, which are aliases of the methods in the object scala.Console.

Assertions

A set of assert functions are provided for use as a way to document and dynamically check invariants in code. Invocations of assert can be elided at compile time by providing the command line option -Xdisable-assertions, which raises -Xelide-below above elidable.ASSERTION, to the scalac command.

Variants of assert intended for use with static analysis tools are also provided: assume, require and ensuring. require and ensuring are intended for use as a means of design-by-contract style specification of pre- and post-conditions on functions, with the intention that these specifications could be consumed by a static analysis tool. For instance,

def addNaturals(nats: List[Int]): Int = {
  require(nats forall (_ >= 0), "List contains negative numbers")
  nats.foldLeft(0)(_ + _)
} ensuring(_ >= 0)

The declaration of addNaturals states that the list of integers passed should only contain natural numbers (i.e. non-negative), and that the result returned will also be natural. require is distinct from assert in that if the condition fails, then the caller of the function is to blame rather than a logical error having been made within addNaturals itself. ensuring is a form of assert that declares the guarantee the function is providing with regards to its return value.

Implicit Conversions

A number of commonly applied implicit conversions are also defined here, and in the parent type scala.LowPriorityImplicits. Implicit conversions are provided for the "widening" of numeric values, for instance, converting a Short value to a Long value as required, and to add additional higher-order functions to Array values. These are described in more detail in the documentation of scala.Array.

Source
Predef.scala
Linear Supertypes
DeprecatedPredef, LowPriorityImplicits, AnyRef, Any
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Type Members

  1. sealed abstract class <:< [-From, +To] extends (From) ⇒ To with Serializable

    An instance of A <:< B witnesses that A is a subtype of B.

    An instance of A <:< B witnesses that A is a subtype of B. Requiring an implicit argument of the type A <:< B encodes the generalized constraint A <: B.

    Annotations
    @implicitNotFound( msg = ... )
    Note

    we need a new type constructor <:< and evidence conforms, as reusing Function1 and identity leads to ambiguities in case of type errors (any2stringadd is inferred) To constrain any abstract type T that's in scope in a method's argument list (not just the method's own type parameters) simply add an implicit argument of type T <:< U, where U is the required upper bound; or for lower-bounds, use: L <:< T, where L is the required lower bound. In part contributed by Jason Zaugg.

  2. sealed abstract class =:= [From, To] extends (From) ⇒ To with Serializable

    An instance of A =:= B witnesses that the types A and B are equal.

    An instance of A =:= B witnesses that the types A and B are equal.

    Annotations
    @implicitNotFound( msg = ... )
    See also

    <:< for expressing subtyping constraints

  3. implicit final class ArrayCharSequence extends CharSequence

  4. implicit final class ArrowAssoc [A] extends AnyVal

  5. type Class[T] = java.lang.Class[T]

  6. class DummyImplicit extends AnyRef

    A type for which there is always an implicit value.

    A type for which there is always an implicit value.

    See also

    scala.Array$, method fallbackCanBuildFrom

  7. implicit final class Ensuring [A] extends AnyVal

  8. type Function[-A, +B] = (A) ⇒ B

  9. type Manifest[T] = reflect.Manifest[T]
    Annotations
    @implicitNotFound( msg = "No Manifest available for ${T}." )
  10. type Map[A, +B] = collection.immutable.Map[A, B]

  11. type OptManifest[T] = reflect.OptManifest[T]
  12. implicit final class RichException extends AnyVal
  13. implicit final class SeqCharSequence extends CharSequence

  14. type Set[A] = collection.immutable.Set[A]

  15. type String = java.lang.String

    The String type in Scala has methods that come either from the underlying Java String (see the documentation corresponding to your Java version, for example http://docs.oracle.com/javase/8/docs/api/java/lang/String.html) or are added implicitly through scala.collection.immutable.StringOps.

  16. implicit final class StringFormat [A] extends AnyVal

  17. implicit final class any2stringadd [A] extends AnyVal

  18. type ClassManifest[T] = ClassTag[T]
    Annotations
    @implicitNotFound( msg = ... ) @deprecated
    Deprecated

    (Since version 2.10.0) use scala.reflect.ClassTag instead

  19. type Pair[+A, +B] = (A, B)
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use built-in tuple syntax or Tuple2 instead

  20. type Triple[+A, +B, +C] = (A, B, C)
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use built-in tuple syntax or Tuple3 instead

Value Members

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

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

    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. implicit def $conforms[A]: <:<[A, A]

  4. final def ==(arg0: Any): Boolean

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  5. def ???: Nothing

    ??? can be used for marking methods that remain to be implemented.

    ??? can be used for marking methods that remain to be implemented.

    Exceptions thrown
  6. implicit def Boolean2boolean(x: java.lang.Boolean): Boolean

  7. implicit def Byte2byte(x: java.lang.Byte): Byte

  8. implicit def Character2char(x: Character): Char

  9. implicit def Double2double(x: java.lang.Double): Double

  10. implicit def Float2float(x: java.lang.Float): Float

  11. implicit def Integer2int(x: Integer): Int

  12. implicit def Long2long(x: java.lang.Long): Long

  13. val Manifest: ManifestFactory.type
  14. val Map: collection.immutable.Map.type

  15. val NoManifest: reflect.NoManifest.type
  16. val Set: collection.immutable.Set.type

  17. implicit def Short2short(x: java.lang.Short): Short

  18. implicit val StringCanBuildFrom: CanBuildFrom[String, Char, String]
  19. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver object is not an instance of the erasure of type T0.

  20. final def assert(assertion: Boolean, message: ⇒ Any): Unit

    Tests an expression, throwing an AssertionError if false.

    Tests an expression, throwing an AssertionError if false. Calls to this method will not be generated if -Xelide-below is greater than ASSERTION.

    assertion

    the expression to test

    message

    a String to include in the failure message

    Annotations
    @elidable( level = ASSERTION ) @inline()
    See also

    elidable

  21. def assert(assertion: Boolean): Unit

    Tests an expression, throwing an AssertionError if false.

    Tests an expression, throwing an AssertionError if false. Calls to this method will not be generated if -Xelide-below is greater than ASSERTION.

    assertion

    the expression to test

    Annotations
    @elidable( level = ASSERTION )
    See also

    elidable

  22. final def assume(assumption: Boolean, message: ⇒ Any): Unit

    Tests an expression, throwing an AssertionError if false.

    Tests an expression, throwing an AssertionError if false. This method differs from assert only in the intent expressed: assert contains a predicate which needs to be proven, while assume contains an axiom for a static checker. Calls to this method will not be generated if -Xelide-below is greater than ASSERTION.

    assumption

    the expression to test

    message

    a String to include in the failure message

    Annotations
    @elidable( level = ASSERTION ) @inline()
    See also

    elidable

  23. def assume(assumption: Boolean): Unit

    Tests an expression, throwing an AssertionError if false.

    Tests an expression, throwing an AssertionError if false. This method differs from assert only in the intent expressed: assert contains a predicate which needs to be proven, while assume contains an axiom for a static checker. Calls to this method will not be generated if -Xelide-below is greater than ASSERTION.

    assumption

    the expression to test

    Annotations
    @elidable( level = ASSERTION )
    See also

    elidable

  24. implicit def augmentString(x: String): StringOps

    Annotations
    @inline()
  25. implicit def boolean2Boolean(x: Boolean): java.lang.Boolean

  26. implicit def booleanArrayOps(xs: Array[Boolean]): ofBoolean
  27. implicit def booleanWrapper(x: Boolean): RichBoolean
    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  28. implicit def byte2Byte(x: Byte): java.lang.Byte

  29. implicit def byteArrayOps(xs: Array[Byte]): ofByte
  30. implicit def byteWrapper(x: Byte): RichByte

    We prefer the java.lang.* boxed types to these wrappers in any potential conflicts.

    We prefer the java.lang.* boxed types to these wrappers in any potential conflicts. Conflicts do exist because the wrappers need to implement ScalaNumber in order to have a symmetric equals method, but that implies implementing java.lang.Number as well.

    Note - these are inlined because they are value classes, but the call to xxxWrapper is not eliminated even though it does nothing. Even inlined, every call site does a no-op retrieval of Predef's MODULE$ because maybe loading Predef has side effects!

    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  31. implicit def char2Character(x: Char): Character

  32. implicit def charArrayOps(xs: Array[Char]): ofChar
  33. implicit def charWrapper(c: Char): RichChar
    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  34. def classOf[T]: Class[T]

    Retrieve the runtime representation of a class type.

    Retrieve the runtime representation of a class type. classOf[T] is equivalent to the class literal T.class in Java.

    Example:
    1. val listClass = classOf[List[_]]
      // listClass is java.lang.Class[List[_]] = class scala.collection.immutable.List
      
      val mapIntString = classOf[Map[Int,String]]
      // mapIntString is java.lang.Class[Map[Int,String]] = interface scala.collection.immutable.Map
  35. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
    Note

    not specified by SLS as a member of AnyRef

  36. implicit def double2Double(x: Double): java.lang.Double

  37. implicit def doubleArrayOps(xs: Array[Double]): ofDouble
  38. implicit def doubleWrapper(x: Double): RichDouble
    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  39. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (that) is a reference to the receiver object (this).

    Tests whether the argument (that) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

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

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to eq.

    See also equals in scala.Any.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  41. implicit def fallbackStringCanBuildFrom[T]: CanBuildFrom[String, T, collection.immutable.IndexedSeq[T]]
    Definition Classes
    LowPriorityImplicits
  42. def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
    Note

    not specified by SLS as a member of AnyRef

  43. implicit def float2Float(x: Float): java.lang.Float

  44. implicit def floatArrayOps(xs: Array[Float]): ofFloat
  45. implicit def floatWrapper(x: Float): RichFloat
    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  46. implicit def genericArrayOps[T](xs: Array[T]): ArrayOps[T]
  47. implicit def genericWrapArray[T](xs: Array[T]): WrappedArray[T]

    Definition Classes
    LowPriorityImplicits
  48. final def getClass(): java.lang.Class[_]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

    a class object corresponding to the runtime type of the receiver.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  49. def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  50. def identity[A](x: A): A

    Annotations
    @inline()
  51. def implicitly[T](implicit e: T): T

    Annotations
    @inline()
  52. implicit def int2Integer(x: Int): Integer

  53. implicit def intArrayOps(xs: Array[Int]): ofInt
  54. implicit def intWrapper(x: Int): RichInt
    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  55. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
  56. def locally[T](x: T): T

    Annotations
    @inline()
  57. implicit def long2Long(x: Long): java.lang.Long

  58. implicit def longArrayOps(xs: Array[Long]): ofLong
  59. implicit def longWrapper(x: Long): RichLong
    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  60. def manifest[T](implicit m: Manifest[T]): Manifest[T]
  61. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  62. final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  63. final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  64. def optManifest[T](implicit m: OptManifest[T]): OptManifest[T]
  65. def print(x: Any): Unit

    Prints an object to out using its toString method.

    Prints an object to out using its toString method.

    x

    the object to print; may be null.

  66. def printf(text: String, xs: Any*): Unit

    Prints its arguments as a formatted string to the default output, based on a string pattern (in a fashion similar to printf in C).

    Prints its arguments as a formatted string to the default output, based on a string pattern (in a fashion similar to printf in C).

    The interpretation of the formatting patterns is described in java.util.Formatter.

    Consider using the f interpolator as more type safe and idiomatic.

    text

    the pattern for formatting the arguments.

    Exceptions thrown

    java.lang.IllegalArgumentException if there was a problem with the format string or arguments

    See also

    StringContext.f

  67. def println(x: Any): Unit

    Prints out an object to the default output, followed by a newline character.

    Prints out an object to the default output, followed by a newline character.

    x

    the object to print.

  68. def println(): Unit

    Prints a newline character on the default output.

  69. implicit def refArrayOps[T <: AnyRef](xs: Array[T]): ofRef[T]
  70. final def require(requirement: Boolean, message: ⇒ Any): Unit

    Tests an expression, throwing an IllegalArgumentException if false.

    Tests an expression, throwing an IllegalArgumentException if false. This method is similar to assert, but blames the caller of the method for violating the condition.

    requirement

    the expression to test

    message

    a String to include in the failure message

    Annotations
    @inline()
  71. def require(requirement: Boolean): Unit

    Tests an expression, throwing an IllegalArgumentException if false.

    Tests an expression, throwing an IllegalArgumentException if false. This method is similar to assert, but blames the caller of the method for violating the condition.

    requirement

    the expression to test

  72. implicit def short2Short(x: Short): java.lang.Short

  73. implicit def shortArrayOps(xs: Array[Short]): ofShort
  74. implicit def shortWrapper(x: Short): RichShort
    Definition Classes
    LowPriorityImplicits
    Annotations
    @inline()
  75. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  76. def toString(): java.lang.String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    AnyRef → Any
  77. implicit def tuple2ToZippedOps[T1, T2](x: (T1, T2)): Ops[T1, T2]
  78. implicit def tuple3ToZippedOps[T1, T2, T3](x: (T1, T2, T3)): Ops[T1, T2, T3]
  79. implicit def unaugmentString(x: StringOps): String

    Annotations
    @inline()
  80. implicit def unitArrayOps(xs: Array[Unit]): ofUnit
  81. implicit def unwrapString(ws: WrappedString): String

    Definition Classes
    LowPriorityImplicits
  82. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  83. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  84. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  85. implicit def wrapBooleanArray(xs: Array[Boolean]): WrappedArray[Boolean]

    Definition Classes
    LowPriorityImplicits
  86. implicit def wrapByteArray(xs: Array[Byte]): WrappedArray[Byte]

    Definition Classes
    LowPriorityImplicits
  87. implicit def wrapCharArray(xs: Array[Char]): WrappedArray[Char]

    Definition Classes
    LowPriorityImplicits
  88. implicit def wrapDoubleArray(xs: Array[Double]): WrappedArray[Double]

    Definition Classes
    LowPriorityImplicits
  89. implicit def wrapFloatArray(xs: Array[Float]): WrappedArray[Float]

    Definition Classes
    LowPriorityImplicits
  90. implicit def wrapIntArray(xs: Array[Int]): WrappedArray[Int]

    Definition Classes
    LowPriorityImplicits
  91. implicit def wrapLongArray(xs: Array[Long]): WrappedArray[Long]

    Definition Classes
    LowPriorityImplicits
  92. implicit def wrapRefArray[T <: AnyRef](xs: Array[T]): WrappedArray[T]

    Definition Classes
    LowPriorityImplicits
  93. implicit def wrapShortArray(xs: Array[Short]): WrappedArray[Short]

    Definition Classes
    LowPriorityImplicits
  94. implicit def wrapString(s: String): WrappedString

    Definition Classes
    LowPriorityImplicits
  95. implicit def wrapUnitArray(xs: Array[Unit]): WrappedArray[Unit]

    Definition Classes
    LowPriorityImplicits
  96. object =:= extends Serializable

  97. object DummyImplicit

Deprecated Value Members

  1. val ClassManifest: ClassManifestFactory.type
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) use scala.reflect.ClassTag instead

  2. def any2ArrowAssoc[A](x: A): ArrowAssoc[A]
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use ArrowAssoc

  3. def any2Ensuring[A](x: A): Ensuring[A]
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use Ensuring

  4. def any2stringfmt(x: Any): StringFormat[Any]
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use StringFormat

  5. def arrayToCharSequence(xs: Array[Char]): CharSequence
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use ArrayCharSequence

  6. def classManifest[T](implicit m: ClassManifest[T]): ClassManifest[T]
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) use scala.reflect.classTag[T] instead

  7. def conforms[A]: <:<[A, A]
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use implicitly[T <:< U] or identity instead.

  8. def exceptionWrapper(exc: scala.Throwable): RichException
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use Throwable directly

  9. def readBoolean(): Boolean
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  10. def readByte(): Byte
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  11. def readChar(): Char
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  12. def readDouble(): Double
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  13. def readFloat(): Float
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  14. def readInt(): Int
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  15. def readLine(text: String, args: Any*): String
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  16. def readLine(): String
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  17. def readLong(): Long
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  18. def readShort(): Short
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  19. def readf(format: String): List[Any]
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  20. def readf1(format: String): Any
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  21. def readf2(format: String): (Any, Any)
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  22. def readf3(format: String): (Any, Any, Any)
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use the method in scala.io.StdIn

  23. def seqToCharSequence(xs: collection.IndexedSeq[Char]): CharSequence
    Definition Classes
    DeprecatedPredef
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use SeqCharSequence

  24. object Pair
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use built-in tuple syntax or Tuple2 instead

  25. object Triple
    Annotations
    @deprecated
    Deprecated

    (Since version 2.11.0) use built-in tuple syntax or Tuple3 instead

Inherited from DeprecatedPredef

Inherited from LowPriorityImplicits

Inherited from AnyRef

Inherited from Any

Utility Methods

Assertions

These methods support program verification and runtime correctness.

Console Output

These methods provide output via the console.

Type Constraints

These entities allows constraints between types to be stipulated.

Aliases

These aliases bring selected immutable types into scope without any imports.

String Conversions

Conversions to and from String and StringOps.

Implicit Classes

These implicit classes add useful extension methods to every type.

CharSequence Conversions

These implicit classes add CharSequence methods to Array[Char] and IndexedSeq[Char] instances.

Java to Scala

Implicit conversion from Java primitive wrapper types to Scala equivalents.

Scala to Java

Implicit conversion from Scala AnyVals to Java primitive wrapper types equivalents.

Array to WrappedArray

Conversions from Arrays to WrappedArrays.

Ungrouped