scala.collection.interfaces

# MapMethods

#### trait MapMethods[A, +B, +This <: MapLike[A, B, This] with Map[A, B]] extends IterableMethods[(A, B), This] with SubtractableMethods[A, This]

Self Type
  MapMethods[A, B, This] with Map[A, B]
Source
  MapMethods.scala
Since

  2.8

Linear Supertypes
SubtractableMethods[A, This], IterableMethods[(A, B), This], TraversableMethods[(A, B), This], TraversableOnceMethods[(A, B)], AnyRef, Any
Ordering

1. Alphabetic
2. By inheritance

Inherited

1. Hide All
2. Show all

1. MapMethods
2. SubtractableMethods
3. IterableMethods
4. TraversableMethods
5. TraversableOnceMethods
6. AnyRef
7. Any

Visibility

1. Public
2. All

### Abstract Value Members

1. #### abstract def +[B1 >: B](elem1: (A, B1), elem2: (A, B1), elems: (A, B1)*): Map[A, B1]

2. #### abstract def +[B1 >: B](kv: (A, B1)): Map[A, B1]

3. #### abstract def ++[B1 >: B](xs: GenTraversableOnce[(A, B1)]): Map[A, B1]

4. #### abstract def ++[B >: (A, B), That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That

   Definition Classes
     TraversableMethods

5. #### abstract def ++:[B >: (A, B), That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That

   Definition Classes
     TraversableMethods

6. #### abstract def -(key: A): This

   Definition Classes
     MapMethods → SubtractableMethods

7. #### abstract def -(elem1: A, elem2: A, elems: A*): This

   Definition Classes
     SubtractableMethods

8. #### abstract def --(xs: TraversableOnce[A]): This

   Definition Classes
     SubtractableMethods

9. #### abstract def /:[B](z: B)(op: (B, (A, B)) ⇒ B): B

   Definition Classes
     TraversableOnceMethods

10. #### abstract def :\[B](z: B)(op: ((A, B), B) ⇒ B): B

    Definition Classes
      TraversableOnceMethods

11. #### abstract def addString(buf: StringBuilder): StringBuilder

    Definition Classes
      TraversableOnceMethods

12. #### abstract def addString(buf: StringBuilder, sep: String): StringBuilder

    Definition Classes
      TraversableOnceMethods

13. #### abstract def addString(buf: StringBuilder, start: String, sep: String, end: String): StringBuilder

    Definition Classes
      TraversableOnceMethods

14. #### abstract def apply(key: A): B

15. #### abstract def collect[B, That](pf: PartialFunction[(A, B), B])(implicit bf: CanBuildFrom[This, B, That]): That

    Definition Classes
      TraversableMethods

16. #### abstract def collectFirst[B](pf: PartialFunction[(A, B), B]): Option[B]

    Definition Classes
      TraversableOnceMethods

17. #### abstract def contains(key: A): Boolean

18. #### abstract def copyToArray[B >: (A, B)](xs: Array[B], start: Int, len: Int): Unit

    Definition Classes
      TraversableOnceMethods

19. #### abstract def copyToArray[B >: (A, B)](xs: Array[B], start: Int): Unit

    Definition Classes
      TraversableOnceMethods

20. #### abstract def copyToArray[B >: (A, B)](xs: Array[B]): Unit

    Definition Classes
      TraversableOnceMethods

21. #### abstract def copyToBuffer[B >: (A, B)](dest: Buffer[B]): Unit

    Definition Classes
      TraversableOnceMethods

22. #### abstract def count(p: ((A, B)) ⇒ Boolean): Int

    Definition Classes
      TraversableOnceMethods

23. #### abstract def default(key: A): B

24. #### abstract def drop(n: Int): Traversable[(A, B)]

    Definition Classes
      TraversableMethods

25. #### abstract def dropRight(n: Int): Iterable[(A, B)]

    Definition Classes
      IterableMethods

26. #### abstract def dropWhile(p: ((A, B)) ⇒ Boolean): Traversable[(A, B)]

    Definition Classes
      TraversableMethods

27. #### abstract def empty: This

28. #### abstract def exists(p: ((A, B)) ⇒ Boolean): Boolean

    Definition Classes
      TraversableOnceMethods

29. #### abstract def filter(p: ((A, B)) ⇒ Boolean): Traversable[(A, B)]

    Definition Classes
      TraversableMethods

30. #### abstract def filterKeys(p: (A) ⇒ Boolean): Map[A, B]

31. #### abstract def filterNot(p: ((A, B)) ⇒ Boolean): Traversable[(A, B)]

    Definition Classes
      TraversableMethods

32. #### abstract def find(p: ((A, B)) ⇒ Boolean): Option[(A, B)]

    Definition Classes
      TraversableOnceMethods

33. #### abstract def flatMap[B, That](f: ((A, B)) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[This, B, That]): That

    Definition Classes
      TraversableMethods

34. #### abstract def foldLeft[B](z: B)(op: (B, (A, B)) ⇒ B): B

    Definition Classes
      TraversableOnceMethods

35. #### abstract def foldRight[B](z: B)(op: ((A, B), B) ⇒ B): B

    Definition Classes
      TraversableOnceMethods

36. #### abstract def forall(p: ((A, B)) ⇒ Boolean): Boolean

    Definition Classes
      TraversableOnceMethods

37. #### abstract def foreach[U](f: ((A, B)) ⇒ U): Unit

    Definition Classes
      TraversableOnceMethods

38. #### abstract def get(key: A): Option[B]

39. #### abstract def getOrElse[B1 >: B](key: A, default: ⇒ B1): B1

40. #### abstract def groupBy[K](f: ((A, B)) ⇒ K): Map[K, Traversable[(A, B)]]

    Definition Classes
      TraversableMethods

41. #### abstract def grouped(size: Int): Iterator[Iterable[(A, B)]]

    Definition Classes
      IterableMethods

42. #### abstract def hasDefiniteSize: Boolean

    Definition Classes
      TraversableOnceMethods

43. #### abstract def head: (A, B)

    Definition Classes
      TraversableMethods

44. #### abstract def headOption: Option[(A, B)]

    Definition Classes
      TraversableMethods

45. #### abstract def init: Traversable[(A, B)]

    Definition Classes
      TraversableMethods

46. #### abstract def inits: Iterator[This]

    Definition Classes
      TraversableMethods

47. #### abstract def isDefinedAt(key: A): Boolean

48. #### abstract def isEmpty: Boolean

    Definition Classes
      TraversableOnceMethods

49. #### abstract def isTraversableAgain: Boolean

    Definition Classes
      TraversableOnceMethods

50. #### abstract def iterator: Iterator[(A, B)]

    Definition Classes
      MapMethods → IterableMethods

51. #### abstract def keySet: Set[A]

52. #### abstract def keys: Iterable[A]

53. #### abstract def keysIterator: Iterator[A]

54. #### abstract def last: (A, B)

    Definition Classes
      TraversableMethods

55. #### abstract def lastOption: Option[(A, B)]

    Definition Classes
      TraversableMethods

56. #### abstract def map[B, That](f: ((A, B)) ⇒ B)(implicit bf: CanBuildFrom[This, B, That]): That

    Definition Classes
      TraversableMethods

57. #### abstract def mapValues[C](f: (B) ⇒ C): Map[A, C]

58. #### abstract def max[B >: (A, B)](implicit cmp: Ordering[B]): (A, B)

    Definition Classes
      TraversableOnceMethods

59. #### abstract def maxBy[B](f: ((A, B)) ⇒ B)(implicit cmp: Ordering[B]): (A, B)

    Definition Classes
      TraversableOnceMethods

60. #### abstract def min[B >: (A, B)](implicit cmp: Ordering[B]): (A, B)

    Definition Classes
      TraversableOnceMethods

61. #### abstract def minBy[B](f: ((A, B)) ⇒ B)(implicit cmp: Ordering[B]): (A, B)

    Definition Classes
      TraversableOnceMethods

62. #### abstract def mkString: String

    Definition Classes
      TraversableOnceMethods

63. #### abstract def mkString(sep: String): String

    Definition Classes
      TraversableOnceMethods

64. #### abstract def mkString(start: String, sep: String, end: String): String

    Definition Classes
      TraversableOnceMethods

65. #### abstract def nonEmpty: Boolean

    Definition Classes
      TraversableOnceMethods

66. #### abstract def partition(p: ((A, B)) ⇒ Boolean): (Traversable[(A, B)], Traversable[(A, B)])

    Definition Classes
      TraversableMethods

67. #### abstract def product[B >: (A, B)](implicit num: Numeric[B]): B

    Definition Classes
      TraversableOnceMethods

68. #### abstract def reduceLeft[B >: (A, B)](op: (B, (A, B)) ⇒ B): B

    Definition Classes
      TraversableOnceMethods

69. #### abstract def reduceLeftOption[B >: (A, B)](op: (B, (A, B)) ⇒ B): Option[B]

    Definition Classes
      TraversableOnceMethods

70. #### abstract def reduceRight[B >: (A, B)](op: ((A, B), B) ⇒ B): B

    Definition Classes
      TraversableOnceMethods

71. #### abstract def reduceRightOption[B >: (A, B)](op: ((A, B), B) ⇒ B): Option[B]

    Definition Classes
      TraversableOnceMethods

72. #### abstract def reversed: TraversableOnce[(A, B)]

    Attributes
      protected[this]
    Definition Classes
      TraversableOnceMethods

73. #### abstract def sameElements[B >: (A, B)](that: GenIterable[B]): Boolean

    Definition Classes
      IterableMethods

74. #### abstract def scanLeft[B, That](z: B)(op: (B, (A, B)) ⇒ B)(implicit bf: CanBuildFrom[This, B, That]): That

    Definition Classes
      TraversableMethods

75. #### abstract def scanRight[B, That](z: B)(op: ((A, B), B) ⇒ B)(implicit bf: CanBuildFrom[This, B, That]): That

    Definition Classes
      TraversableMethods

76. #### abstract def size: Int

    Definition Classes
      TraversableOnceMethods

77. #### abstract def slice(from: Int, until: Int): Traversable[(A, B)]

    Definition Classes
      TraversableMethods

78. #### abstract def sliding(size: Int, step: Int): Iterator[Iterable[(A, B)]]

    Definition Classes
      IterableMethods

79. #### abstract def sliding(size: Int): Iterator[Iterable[(A, B)]]

    Definition Classes
      IterableMethods

80. #### abstract def span(p: ((A, B)) ⇒ Boolean): (Traversable[(A, B)], Traversable[(A, B)])

    Definition Classes
      TraversableMethods

81. #### abstract def splitAt(n: Int): (Traversable[(A, B)], Traversable[(A, B)])

    Definition Classes
      TraversableMethods

82. #### abstract def stringPrefix: String

    Definition Classes
      TraversableMethods

83. #### abstract def sum[B >: (A, B)](implicit num: Numeric[B]): B

    Definition Classes
      TraversableOnceMethods

84. #### abstract def tail: Traversable[(A, B)]

    Definition Classes
      TraversableMethods

85. #### abstract def tails: Iterator[This]

    Definition Classes
      TraversableMethods

86. #### abstract def take(n: Int): Traversable[(A, B)]

    Definition Classes
      TraversableMethods

87. #### abstract def takeRight(n: Int): Iterable[(A, B)]

    Definition Classes
      IterableMethods

88. #### abstract def takeWhile(p: ((A, B)) ⇒ Boolean): Traversable[(A, B)]

    Definition Classes
      TraversableMethods

89. #### abstract def toArray[B >: (A, B)](implicit arg0: ClassManifest[B]): Array[B]

    Definition Classes
      TraversableOnceMethods

90. #### abstract def toBuffer[B >: (A, B)]: Buffer[B]

    Definition Classes
      TraversableOnceMethods

91. #### abstract def toIndexedSeq: IndexedSeq[(A, B)]

    Definition Classes
      TraversableOnceMethods

92. #### abstract def toIterable: Iterable[(A, B)]

    Definition Classes
      TraversableOnceMethods

93. #### abstract def toIterator: Iterator[(A, B)]

    Definition Classes
      TraversableOnceMethods

94. #### abstract def toList: List[(A, B)]

    Definition Classes
      TraversableOnceMethods

95. #### abstract def toMap[T, U](implicit ev: <:<[(A, B), (T, U)]): Map[T, U]

    Definition Classes
      TraversableOnceMethods

96. #### abstract def toSeq: Seq[(A, B)]

    Definition Classes
      TraversableOnceMethods

97. #### abstract def toSet[B >: (A, B)]: Set[B]

    Definition Classes
      TraversableOnceMethods

98. #### abstract def toStream: Stream[(A, B)]

    Definition Classes
      TraversableOnceMethods

99. #### abstract def toTraversable: Traversable[(A, B)]

    Definition Classes
      TraversableOnceMethods

100. #### abstract def updated[B1 >: B](key: A, value: B1): Map[A, B1]

101. #### abstract def values: Iterable[B]

102. #### abstract def valuesIterator: Iterator[B]

103. #### abstract def view(from: Int, until: Int): IterableView[(A, B), This]

     Definition Classes
       IterableMethods → TraversableMethods

104. #### abstract def view: IterableView[(A, B), This]

     Definition Classes
       IterableMethods → TraversableMethods

105. #### abstract def withFilter(p: ((A, B)) ⇒ Boolean): FilterMonadic[(A, B), Traversable[(A, B)]]

     Definition Classes
       TraversableMethods

106. #### abstract def zip[A1 >: (A, B), B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[This, (A1, B), That]): That

     Definition Classes
       IterableMethods

107. #### abstract def zipAll[B, A1 >: (A, B), That](that: GenIterable[B], e1: A1, e2: B)(implicit bf: CanBuildFrom[This, (A1, B), That]): That

     Definition Classes
       IterableMethods

108. #### abstract def zipWithIndex[A1 >: (A, B), That](implicit bf: CanBuildFrom[This, (A1, Int), That]): That

     Definition Classes
       IterableMethods

### Concrete Value Members

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

   Definition Classes
     AnyRef

2. #### 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

3. #### 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

4. #### final def ==(arg0: AnyRef): Boolean

   Definition Classes
     AnyRef

5. #### 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

6. #### 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`.

7. #### 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[lang]
   Definition Classes
     AnyRef
   Annotations
     @throws()
   Note

     not specified by SLS as a member of AnyRef

8. #### final def eq(arg0: AnyRef): Boolean

   Tests whether the argument (`arg0`) is a reference to the receiver object (`this`).

   Tests whether the argument (`arg0`) 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

9. #### 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 Any.

   returns

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

   Definition Classes
     AnyRef → Any

10. #### 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[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws()
    Note

      not specified by SLS as a member of AnyRef

11. #### final def getClass(): Class[_]

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

      a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
      AnyRef → Any
    Note

      not specified by SLS as a member of AnyRef

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

    The hashCode method for reference types.

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

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any

13. #### 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

14. #### 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

15. #### 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
    Note

      not specified by SLS as a member of AnyRef

16. #### 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
    Note

      not specified by SLS as a member of AnyRef

17. #### final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
      AnyRef

18. #### 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.

    Definition Classes
      AnyRef → Any

19. #### final def wait(): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws()

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

    Definition Classes
      AnyRef
    Annotations
      @throws()

21. #### final def wait(arg0: Long): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws()

### Inherited from SubtractableMethods[A, This]

### Inherited from IterableMethods[(A, B), This]

### Inherited from TraversableMethods[(A, B), This]

### Inherited from TraversableOnceMethods[(A, B)]

### Inherited from AnyRef

### Inherited from Any