scala

# Boolean

#### abstract final class Boolean extends AnyVal

`Boolean` (equivalent to Java's `boolean` primitive type) is a subtype of scala.AnyVal. Instances of `Boolean` are not represented by an object in the underlying runtime system.

There is an implicit conversion from scala.Boolean => scala.runtime.RichBoolean which provides useful non-primitive operations.

Source
  Boolean.scala

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AnyVal, NotNull, Any
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Inherited

1. Boolean
2. AnyVal
3. NotNull
4. Any

Implicitly

1. by boolean2BooleanConflict
2. by boolean2Boolean
3. by booleanWrapper
4. by any2stringadd
5. by any2stringfmt
6. by any2ArrowAssoc
7. by any2Ensuring

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### Instance Constructors

1. #### new Boolean()

### Abstract Value Members

1. #### abstract def !=(x: Boolean): Boolean

   Compares two Boolean expressions and returns `true` if they evaluate to a different value.

   Compares two Boolean expressions and returns `true` if they evaluate to a different value.

   `a != b` returns `true` if and only if

   - `a` is `true` and `b` is `false` or
   - `a` is `false` and `b` is `true`.

2. #### abstract def &(x: Boolean): Boolean

   Compares two Boolean expressions and returns `true` if both of them evaluate to true.

   Compares two Boolean expressions and returns `true` if both of them evaluate to true.

   `a & b` returns `true` if and only if

   - `a` and `b` are `true`.
   Note

     This method evaluates both `a` and `b`, even if the result is already determined after evaluating `a`.

3. #### abstract def &&(x: Boolean): Boolean

   Compares two Boolean expressions and returns `true` if both of them evaluate to true.

   Compares two Boolean expressions and returns `true` if both of them evaluate to true.

   `a && b` returns `true` if and only if

   - `a` and `b` are `true`.
   Note

     This method uses 'short-circuit' evaluation and behaves as if it was declared as `def &&(x: => Boolean): Boolean`. If `a` evaluates to `false`, `false` is returned without evaluating `b`.

4. #### abstract def ==(x: Boolean): Boolean

   Compares two Boolean expressions and returns `true` if they evaluate to the same value.

   Compares two Boolean expressions and returns `true` if they evaluate to the same value.

   `a == b` returns `true` if and only if

   - `a` and `b` are `true` or
   - `a` and `b` are `false`.

5. #### abstract def ^(x: Boolean): Boolean

   Compares two Boolean expressions and returns `true` if they evaluate to a different value.

   Compares two Boolean expressions and returns `true` if they evaluate to a different value.

   `a ^ b`returns` true`if and only if``

   - `a` is `true` and `b` is `false` or
   - `a` is `false` and `b` is `true`.

6. #### abstract def unary_!: Boolean

   Negates a Boolean expression.

   Negates a Boolean expression.

   - `!a` results in `false` if and only if `a` evaluates to `true` and - `!a` results in `true` if and only if `a` evaluates to `false`.

   returns

     the negated expression

7. #### abstract def |(x: Boolean): Boolean

   Compares two Boolean expressions and returns `true` if one or both of them evaluate to true.

   Compares two Boolean expressions and returns `true` if one or both of them evaluate to true.

   `a | b` returns `true` if and only if

   - `a` is `true` or
   - `b` is `true` or
   - `a` and `b` are `true`.
   Note

     This method evaluates both `a` and `b`, even if the result is already determined after evaluating `a`.

8. #### abstract def ||(x: Boolean): Boolean

   Compares two Boolean expressions and returns `true` if one or both of them evaluate to true.

   Compares two Boolean expressions and returns `true` if one or both of them evaluate to true.

   `a || b` returns `true` if and only if

   - `a` is `true` or
   - `b` is `true` or
   - `a` and `b` are `true`.
   Note

     This method uses 'short-circuit' evaluation and behaves as if it was declared as `def ||(x: => Boolean): Boolean`. If `a` evaluates to `true`, `true` is returned without evaluating `b`.

### Concrete 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
     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
     Any

3. #### def +(other: String): String

   Implicit information
     This member is added by an implicit conversion from Boolean to StringAdd performed by method any2stringadd in scala.Predef.
   Definition Classes
     StringAdd

4. #### def ->[B](y: B): (Boolean, B)

   Implicit information
     This member is added by an implicit conversion from Boolean to ArrowAssoc[Boolean] performed by method any2ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()

5. #### def <(that: Boolean): Boolean

   Returns true if `this` is less than `that`

   Returns true if `this` is less than `that`

   Implicit information
     This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
   Definition Classes
     Ordered

6. #### def <=(that: Boolean): Boolean

   Returns true if `this` is less than or equal to `that`.

   Returns true if `this` is less than or equal to `that`.

   Implicit information
     This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
   Definition Classes
     Ordered

7. #### final def ==(arg0: Any): Boolean

   Test two objects for equality.

   Test two objects for equality. 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
     Any

8. #### def >(that: Boolean): Boolean

   Returns true if `this` is greater than `that`.

   Returns true if `this` is greater than `that`.

   Implicit information
     This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
   Definition Classes
     Ordered

9. #### def >=(that: Boolean): Boolean

   Returns true if `this` is greater than or equal to `that`.

   Returns true if `this` is greater than or equal to `that`.

   Implicit information
     This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
   Definition Classes
     Ordered

10. #### 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`.

11. #### def booleanValue(): Boolean

    Implicit information
      This member is added by an implicit conversion from Boolean to java.lang.Boolean performed by method boolean2Boolean in scala.Predef.
    Definition Classes
      Boolean

12. #### def compare(y: Boolean): Int

    Result of comparing `this` with operand `that`.

    Result of comparing `this` with operand `that`.

    Implement this method to determine how instances of A will be sorted.

    Returns `x` where:

    - `x < 0` when `this < that`
    - `x == 0` when `this == that`
    - `x > 0` when `this > that`
    Implicit information
      This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
    Definition Classes
      OrderedProxy → Ordered

13. #### def compareTo(arg0: java.lang.Boolean): Int

    Implicit information
      This member is added by an implicit conversion from Boolean to java.lang.Boolean performed by method boolean2Boolean in scala.Predef.
    Definition Classes
      Boolean → Comparable

14. #### def compareTo(that: Boolean): Int

    Result of comparing `this` with operand `that`.

    Result of comparing `this` with operand `that`.

    Implicit information
      This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
    Definition Classes
      Ordered → Comparable

15. #### def ensuring(cond: (Boolean) ⇒ Boolean, msg: ⇒ Any): Boolean

    Implicit information
      This member is added by an implicit conversion from Boolean to Ensuring[Boolean] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

16. #### def ensuring(cond: (Boolean) ⇒ Boolean): Boolean

    Implicit information
      This member is added by an implicit conversion from Boolean to Ensuring[Boolean] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

17. #### def ensuring(cond: Boolean, msg: ⇒ Any): Boolean

    Implicit information
      This member is added by an implicit conversion from Boolean to Ensuring[Boolean] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

18. #### def ensuring(cond: Boolean): Boolean

    Implicit information
      This member is added by an implicit conversion from Boolean to Ensuring[Boolean] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

19. #### def equals(arg0: Any): Boolean

    Compares the receiver object (`this`) with the argument object (`that`) for equivalence.

    Compares the receiver object (`this`) with the argument object (`that`) for equivalence.

    Any implementation of this method should be an equivalence relation:

    - It is reflexive: for any instance `x` of type `Any`, `x.equals(x)` should return `true`.
    - It is symmetric: for any instances `x` and `y` of type `Any`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`.
    - It is transitive: for any instances `x`, `y`, and `z` of type `AnyRef` if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`.

    If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is usually necessary to override `hashCode` to ensure that objects which are "equal" (`o1.equals(o2)` returns `true`) hash to the same scala.Int. (`o1.hashCode.equals(o2.hashCode)`).

    returns

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

    Definition Classes
      Any

20. #### 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 Boolean to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

21. #### def getClass(): Class[Boolean]

    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
      Boolean → AnyVal → Any

22. #### def hashCode(): Int

    Calculate a hash code value for the object.

    Calculate a hash code value for the object.

    The default hashing algorithm is platform dependent.

    Note that it is allowed for two objects to have identical hash codes (`o1.hashCode.equals(o2.hashCode)`) yet not be equal (`o1.equals(o2)` returns `false`). A degenerate implementation could always return `0`. However, it is required that if two objects are equal (`o1.equals(o2)` returns `true`) that they have identical hash codes (`o1.hashCode.equals(o2.hashCode)`). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the `equals` method.

    returns

      the hash code value for this object.

    Definition Classes
      Any

23. #### 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

24. #### def toString(): String

    Returns a string representation of the object.

    Returns a string representation of the object.

    The default representation is platform dependent.

    returns

      a string representation of the object.

    Definition Classes
      Any

25. #### def →[B](y: B): (Boolean, B)

    Implicit information
      This member is added by an implicit conversion from Boolean to ArrowAssoc[Boolean] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Shadowed Implicit Value Members

1. #### 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.

   Implicit information
     This member is added by an implicit conversion from Boolean to java.lang.Boolean performed by method boolean2Boolean in scala.Predef.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (boolean: java.lang.Boolean).equals(arg0)

   Definition Classes
     Boolean → AnyRef → Any

2. #### 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.

   Implicit information
     This member is added by an implicit conversion from Boolean to java.lang.Boolean performed by method boolean2Boolean in scala.Predef.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (boolean: java.lang.Boolean).hashCode()

   Definition Classes
     Boolean → AnyRef → Any

3. #### val self: Boolean

   Implicit information
     This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (boolean: RichBoolean).self

   Definition Classes
     RichBoolean → Typed → Proxy

4. #### val self: Any

   Implicit information
     This member is added by an implicit conversion from Boolean to StringAdd performed by method any2stringadd in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (boolean: StringAdd).self

   Definition Classes
     StringAdd

5. #### val self: Any

   Implicit information
     This member is added by an implicit conversion from Boolean to StringFormat performed by method any2stringfmt in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (boolean: StringFormat).self

   Definition Classes
     StringFormat

6. #### def toString(): 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.

   Implicit information
     This member is added by an implicit conversion from Boolean to java.lang.Boolean performed by method boolean2Boolean in scala.Predef.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (boolean: java.lang.Boolean).toString()

   Definition Classes
     Boolean → AnyRef → Any

7. #### def toString(): String

   Returns a string representation of the object.

   Returns a string representation of the object.

   The default representation is platform dependent.

   returns

     a string representation of the object.

   Implicit information
     This member is added by an implicit conversion from Boolean to RichBoolean performed by method booleanWrapper in scala.LowPriorityImplicits.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (boolean: RichBoolean).toString()

   Definition Classes
     Proxy → Any

### Deprecated Value Members

1. #### def x: Boolean

   Implicit information
     This member is added by an implicit conversion from Boolean to ArrowAssoc[Boolean] performed by method any2ArrowAssoc in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (boolean: ArrowAssoc[Boolean]).x

   Definition Classes
     ArrowAssoc
   Annotations
     @deprecated
   Deprecated

     (Since version 2.10.0) Use `leftOfArrow`instead``

2. #### def x: Boolean

   Implicit information
     This member is added by an implicit conversion from Boolean to Ensuring[Boolean] performed by method any2Ensuring in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (boolean: Ensuring[Boolean]).x

   Definition Classes
     Ensuring
   Annotations
     @deprecated
   Deprecated

     (Since version 2.10.0) Use `resultOfEnsuring`instead``

### Inherited from AnyVal

### Inherited from NotNull

### Inherited from Any

### Inherited by implicit conversion boolean2BooleanConflict from Boolean to AnyRef

### Inherited by implicit conversion boolean2Boolean from Boolean to java.lang.Boolean

### Inherited by implicit conversion booleanWrapper from Boolean to RichBoolean

### Inherited by implicit conversion any2stringadd from Boolean to StringAdd

### Inherited by implicit conversion any2stringfmt from Boolean to StringFormat

### Inherited by implicit conversion any2ArrowAssoc from Boolean to ArrowAssoc[Boolean]

### Inherited by implicit conversion any2Ensuring from Boolean to Ensuring[Boolean]

### Ungrouped