scala.collection.jcl
trait Map

[source: `scala/collection/jcl/Map.scala`]

`` `trait` Map[K, E]
  `extends` MutableIterable[(K, E)]`with` Map[K, E]

  A mutable map that is compatible with Java maps.

Author
  Sean McDirmid

Direct Known Subclasses:
  Map.Lense, Map.Filter, MapWrapper, SortedMap

Method Summary
`override def` | + (pair : (K, E)) : Map Add a key/value pair to this map.
`override def` | += (pair : (K, E)) : Unit Add a key/value pair to this map.
`override def` | - (key : K) : Map Remove a key from this map
`override def` | -= (key : K) : Unit Remove a key from this map, noop if key is not present.
`override def` | clear : Unit Removes all mappings from the map. After this operation is completed, the map is empty.
`override abstract def` | elements : MutableIterator[(K, E)] Creates a new iterator over all elements contained in this object.
`override def` | get (key : K) : Option[E] Check if this map maps `key` to a value and return the value if it exists.
`override def` | has (pair : (K, E)) : Boolean
`override def` | isEmpty : Boolean Is this an empty map?
`override def` | keySet : Set[K]
`override final def` | keys : MutableIterator[K] Creates an iterator for all keys.
`def` | lense [F](f : (E) => F, g : (F) => E) : Map[K, F]
`override def` | projection : Projection returns a facade that can be used to call non-strict `filter`, `map`, and `flatMap` methods that build projections of the collection.
`abstract def` | put (key : K, elem : E) : Option[E]
`def` | putAll (that : Iterable[(K, E)]) : Unit
`def` | remove (key : K) : Option[E]
`override def` | update (key : K, e : E) : Unit This method allows one to add a new mapping from `key` to `value` to the map. If the map already contains a mapping for `key`, it will be overridden by this function.
`def` | valueSet : MutableIterable[E] The values of this map as a projection, which means removals from the returned collection will remove the element from this map.

Methods inherited from Map
+=, ++=, ++=, +, ++, ++, -=, --=, --=, -, --, --, getOrElseUpdate, transform, retain, <<, clone, +=, incl, excl

Methods inherited from Map
size (abstract), getOrElse, apply, contains, isDefinedAt, values, equals, hashCode, toString, default

Methods inherited from PartialFunction
orElse, andThen

Methods inherited from Function1
compose

Methods inherited from MutableIterable
remove, removeAll, --, -, retain, retainAll, size0

Methods inherited from Collection
toArray, stringPrefix

Methods inherited from Iterable
concat, ++, map, flatMap, filter, takeWhile, dropWhile, take, drop, foreach, forall, exists, find, findIndexOf, indexOf, foldLeft, foldRight, /:, :\, reduceLeft, reduceRight, copyToBuffer, sameElements, toList, mkString, mkString, addString, addString, copyToArray, hasDefiniteSize

Methods inherited from AnyRef
getClass, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized

Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf

Class Summary
`protected class` | Filter (p : (K) => Boolean)`extends` Map[K, E]
`protected class` | KeySet `extends` Set[K]
`protected class` | Lense [F](f : (E) => F, g : (F) => E)`extends` Map[K, F]
`trait` | MutableIterableProjection `extends` Projection
`trait` | Projection `extends` MutableIterableProjection `with` Projection

Method Details

`override` `def` clear : Unit

  Removes all mappings from the map. After this operation is completed, the map is empty.

Overrides MutableIterable.clear, Map.clear

`override` `def` isEmpty : Boolean

  Is this an empty map?

Returns
  `true` iff the map is empty.

`override` `def` keySet : Set[K]

Returns
  the keys of this map as a set.

`override final` `def` keys : MutableIterator[K]

  Creates an iterator for all keys.

Returns
  an iterator over all keys.

`` `def` valueSet : MutableIterable[E]

  The values of this map as a projection, which means removals from the returned collection will remove the element from this map.

Returns
  s a projection of this map's elements.

`abstract` `def` put(key : K, elem : E) : Option[E]

`` `def` putAll(that : Iterable[(K, E)]) : Unit

`` `def` remove(key : K) : Option[E]

`override` `def` has(pair : (K, E)) : Boolean

Returns
  true if t is in the collection.

Overrides MutableIterable.has

`override` `def` get(key : K) : Option[E]

  Check if this map maps `key` to a value and return the value if it exists.

Parameters
  `key -` the key of the mapping of interest
Returns
  the value of the mapping, if it exists

`override` `def` update(key : K, e : E) : Unit

  This method allows one to add a new mapping from `key` to `value` to the map. If the map already contains a mapping for `key`, it will be overridden by this function.

Parameters
  `key -` The key to update
  `value -` The new value

Overrides Map.update

`override` `def` +(pair : (K, E)) : Map

  Add a key/value pair to this map.

Parameters
  `kv -` the key/value pair.
Returns
  The map itself with the new binding added in place.

Overrides Map.+

`override` `def` +=(pair : (K, E)) : Unit

  Add a key/value pair to this map.

Parameters
  `kv -` the key/value pair.

Overrides Map.+=

`override` `def` -(key : K) : Map

  Remove a key from this map

Parameters
  `key -` the key to be removed
Returns
  The map itself with the binding for `key` removed if it existed.

Overrides Map.-

`override` `def` -=(key : K) : Unit

  Remove a key from this map, noop if key is not present.

Parameters
  `key -` the key to be removed

Overrides Map.-=

`override abstract` `def` elements : MutableIterator[(K, E)]

  Creates a new iterator over all elements contained in this object.

Returns
  the new iterator

Overrides MutableIterable.elements

`override` `def` projection : Projection

  returns a facade that can be used to call non-strict `filter`, `map`, and `flatMap` methods that build projections of the collection.

Overrides MutableIterable.projection

`` `def` lense[F](f : (E) => F, g : (F) => E) : Map[K, F]