All Superinterfaces:

ImmutableCollection<T>, ImmutableSetIterable<T>, InternalIterable<T>, Iterable<T>, RichIterable<T>, SetIterable<T>, UnsortedSetIterable<T>
```
public interface ImmutableSet<T>
extends UnsortedSetIterable<T>, ImmutableSetIterable<T>
```
ImmutableSet is the non-modifiable equivalent interface to MutableSet. MutableSet.toImmutable() will give you an appropriately trimmed implementation of ImmutableSet. All ImmutableSet implementations must implement the java.util.Set interface in order to satisfy the equals() contract and be compared against other set structures like UnifiedSet or HashSet.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods Deprecated Methods
Modifier and Type	Method	Description
`Set<T>`	`castToSet()`
`<V> ImmutableSet<V>`	`collect(Function<? super T,? extends V> function)`	Returns a new collection with the results of applying the specified function on each element of the source collection.
`ImmutableBooleanSet`	`collectBoolean(BooleanFunction<? super T> booleanFunction)`	Returns a new primitive `boolean` iterable with the results of applying the specified function on each element of the source collection.
`ImmutableByteSet`	`collectByte(ByteFunction<? super T> byteFunction)`	Returns a new primitive `byte` iterable with the results of applying the specified function on each element of the source collection.
`ImmutableCharSet`	`collectChar(CharFunction<? super T> charFunction)`	Returns a new primitive `char` iterable with the results of applying the specified function on each element of the source collection.
`ImmutableDoubleSet`	`collectDouble(DoubleFunction<? super T> doubleFunction)`	Returns a new primitive `double` iterable with the results of applying the specified function on each element of the source collection.
`ImmutableFloatSet`	`collectFloat(FloatFunction<? super T> floatFunction)`	Returns a new primitive `float` iterable with the results of applying the specified function on each element of the source collection.
`<V> ImmutableSet<V>`	`collectIf(Predicate<? super T> predicate, Function<? super T,? extends V> function)`	Returns a new collection with the results of applying the specified function on each element of the source collection, but only for those elements which return true upon evaluation of the predicate.
`ImmutableIntSet`	`collectInt(IntFunction<? super T> intFunction)`	Returns a new primitive `int` iterable with the results of applying the specified function on each element of the source collection.
`ImmutableLongSet`	`collectLong(LongFunction<? super T> longFunction)`	Returns a new primitive `long` iterable with the results of applying the specified function on each element of the source collection.
`ImmutableShortSet`	`collectShort(ShortFunction<? super T> shortFunction)`	Returns a new primitive `short` iterable with the results of applying the specified function on each element of the source collection.
`<P,V> ImmutableSet<V>`	`collectWith(Function2<? super T,? super P,? extends V> function, P parameter)`	Same as `RichIterable.collect(Function)` with a `Function2` and specified parameter which is passed to the block.
`ImmutableSet<T>`	`difference(SetIterable<? extends T> subtrahendSet)`	Returns the set of all members of `this` that are not members of `subtrahendSet`.
`<V> ImmutableSet<V>`	`flatCollect(Function<? super T,? extends Iterable<V>> function)`	`flatCollect` is a special case of `RichIterable.collect(Function)`.
`default <P,V> ImmutableSet<V>`	`flatCollectWith(Function2<? super T,? super P,? extends Iterable<V>> function, P parameter)`
`<V> ImmutableSetMultimap<V,T>`	`groupBy(Function<? super T,? extends V> function)`	For each element of the iterable, the function is evaluated and the results of these evaluations are collected into a new multimap, where the transformed value is the key and the original values are added to the same (or similar) species of collection as the source iterable.
`<V> ImmutableSetMultimap<V,T>`	`groupByEach(Function<? super T,? extends Iterable<V>> function)`	Similar to `RichIterable.groupBy(Function)`, except the result of evaluating function will return a collection of keys for each value.
`ImmutableSet<T>`	`intersect(SetIterable<? extends T> set)`	Returns the set of all objects that are members of both `this` and `set`.
`ImmutableSet<T>`	`newWith(T element)`	This method is similar to the `with` method in `MutableCollection` with the difference that a new copy of this collection with the element appended will be returned.
`ImmutableSet<T>`	`newWithAll(Iterable<? extends T> elements)`	This method is similar to the `withAll` method in `MutableCollection` with the difference that a new copy of this collection with the elements appended will be returned.
`ImmutableSet<T>`	`newWithout(T element)`	This method is similar to the `without` method in `MutableCollection` with the difference that a new copy of this collection with the element removed will be returned.
`ImmutableSet<T>`	`newWithoutAll(Iterable<? extends T> elements)`	This method is similar to the `withoutAll` method in `MutableCollection` with the difference that a new copy of this collection with the elements removed will be returned.
`PartitionImmutableSet<T>`	`partition(Predicate<? super T> predicate)`	Filters a collection into a PartitionedIterable based on the evaluation of the predicate.
`<P> PartitionImmutableSet<T>`	`partitionWith(Predicate2<? super T,? super P> predicate, P parameter)`	Filters a collection into a PartitionIterable based on the evaluation of the predicate.
`ImmutableSet<UnsortedSetIterable<T>>`	`powerSet()`	Returns the set whose members are all possible subsets of `this`.
`ImmutableSet<T>`	`reject(Predicate<? super T> predicate)`	Returns all elements of the source collection that return false when evaluating of the predicate.
`<P> ImmutableSet<T>`	`rejectWith(Predicate2<? super T,? super P> predicate, P parameter)`	Similar to `RichIterable.reject(Predicate)`, except with an evaluation parameter for the second generic argument in `Predicate2`.
`ImmutableSet<T>`	`select(Predicate<? super T> predicate)`	Returns all elements of the source collection that return true when evaluating the predicate.
`<S> ImmutableSet<S>`	`selectInstancesOf(Class<S> clazz)`	Returns all elements of the source collection that are instances of the Class `clazz`.
`<P> ImmutableSet<T>`	`selectWith(Predicate2<? super T,? super P> predicate, P parameter)`	Similar to `RichIterable.select(Predicate)`, except with an evaluation parameter for the second generic argument in `Predicate2`.
`ImmutableSet<T>`	`symmetricDifference(SetIterable<? extends T> setB)`	Returns the set of all objects that are a member of exactly one of `this` and `setB` (elements which are in one of the sets, but not in both).
`ImmutableSet<T>`	`tap(Procedure<? super T> procedure)`	Executes the Procedure for each element in the iterable and returns `this`.
`default ImmutableSet<T>`	`toImmutableSet()`	Overrides toImmutableSet in RichIterable to return this.
`ImmutableSet<T>`	`union(SetIterable<? extends T> set)`	Returns the set of all objects that are a member of `this` or `set` or both.
`<S> ImmutableSet<Pair<T,S>>`	`zip(Iterable<S> that)`	Deprecated. in 6.0.
`ImmutableSet<Pair<T,Integer>>`	`zipWithIndex()`	Deprecated. in 6.0.

Methods inherited from interface org.eclipse.collections.api.collection.ImmutableCollection
aggregateBy, aggregateInPlaceBy, castToCollection, countBy, countByEach, countByWith, groupByUniqueKey, parallelStream, spliterator, stream, sumByDouble, sumByFloat, sumByInt, sumByLong

Methods inherited from interface org.eclipse.collections.api.InternalIterable
forEach, forEachWith, forEachWithIndex

Methods inherited from interface java.lang.Iterable
iterator

Methods inherited from interface org.eclipse.collections.api.RichIterable
aggregateBy, allSatisfy, allSatisfyWith, anySatisfy, anySatisfyWith, appendString, appendString, appendString, asLazy, chunk, collect, collectBoolean, collectByte, collectChar, collectDouble, collectFloat, collectIf, collectInt, collectLong, collectShort, collectWith, contains, containsAll, containsAllArguments, containsAllIterable, containsAny, containsAnyIterable, containsBy, containsNone, containsNoneIterable, count, countBy, countByEach, countByWith, countWith, detect, detectIfNone, detectOptional, detectWith, detectWithIfNone, detectWithOptional, each, flatCollect, flatCollectBoolean, flatCollectByte, flatCollectChar, flatCollectDouble, flatCollectFloat, flatCollectInt, flatCollectLong, flatCollectShort, flatCollectWith, forEach, getAny, getFirst, getLast, getOnly, groupBy, groupByAndCollect, groupByEach, groupByUniqueKey, injectInto, injectInto, injectInto, injectInto, injectInto, injectIntoDouble, injectIntoFloat, injectIntoInt, injectIntoLong, into, isEmpty, makeString, makeString, makeString, makeString, max, max, maxBy, maxByOptional, maxOptional, maxOptional, min, min, minBy, minByOptional, minOptional, minOptional, noneSatisfy, noneSatisfyWith, notEmpty, reduce, reduceInPlace, reduceInPlace, reject, rejectWith, select, selectWith, size, summarizeDouble, summarizeFloat, summarizeInt, summarizeLong, sumOfDouble, sumOfFloat, sumOfInt, sumOfLong, toArray, toArray, toBag, toBiMap, toImmutableBag, toImmutableBiMap, toImmutableList, toImmutableMap, toImmutableSortedBag, toImmutableSortedBag, toImmutableSortedBagBy, toImmutableSortedList, toImmutableSortedList, toImmutableSortedListBy, toImmutableSortedSet, toImmutableSortedSet, toImmutableSortedSetBy, toList, toMap, toMap, toSet, toSortedBag, toSortedBag, toSortedBagBy, toSortedList, toSortedList, toSortedListBy, toSortedMap, toSortedMap, toSortedMapBy, toSortedSet, toSortedSet, toSortedSetBy, toString, zip, zipWithIndex

Methods inherited from interface org.eclipse.collections.api.set.SetIterable
cartesianProduct, differenceInto, equals, hashCode, intersectInto, isProperSubsetOf, isSubsetOf, symmetricDifferenceInto, unionInto

Methods inherited from interface org.eclipse.collections.api.set.UnsortedSetIterable
asParallel, toImmutable

- Method Detail
  - newWith
```
ImmutableSet<T> newWith(T element)
```
    Description copied from interface: ImmutableCollection
    
    This method is similar to the with method in MutableCollection with the difference that a new copy of this collection with the element appended will be returned.
    
    Specified by:
    
    newWith in interface ImmutableCollection<T>
  - newWithout
```
ImmutableSet<T> newWithout(T element)
```
    Description copied from interface: ImmutableCollection
    
    This method is similar to the without method in MutableCollection with the difference that a new copy of this collection with the element removed will be returned.
    
    Specified by:
    
    newWithout in interface ImmutableCollection<T>
  - newWithAll
```
ImmutableSet<T> newWithAll(Iterable<? extends T> elements)
```
    Description copied from interface: ImmutableCollection
    
    This method is similar to the withAll method in MutableCollection with the difference that a new copy of this collection with the elements appended will be returned.
    
    Specified by:
    
    newWithAll in interface ImmutableCollection<T>
  - newWithoutAll
```
ImmutableSet<T> newWithoutAll(Iterable<? extends T> elements)
```
    Description copied from interface: ImmutableCollection
    
    This method is similar to the withoutAll method in MutableCollection with the difference that a new copy of this collection with the elements removed will be returned.
    
    Specified by:
    
    newWithoutAll in interface ImmutableCollection<T>
  - tap
```
ImmutableSet<T> tap(Procedure<? super T> procedure)
```
    Description copied from interface: RichIterable
    Executes the Procedure for each element in the iterable and returns this.
    Example using a Java 8 lambda expression:
    RichIterable<Person> tapped = people.tap(person -> LOGGER.info(person.getName()));
    Specified by:
    
    tap in interface ImmutableCollection<T>
    
    Specified by:
    
    tap in interface ImmutableSetIterable<T>
    
    Specified by:
    
    tap in interface RichIterable<T>
    
    Specified by:
    
    tap in interface SetIterable<T>
    
    Specified by:
    
    tap in interface UnsortedSetIterable<T>
    
    See Also:
    
    RichIterable.each(Procedure), RichIterable.forEach(Procedure)
  - select
```
ImmutableSet<T> select(Predicate<? super T> predicate)
```
    Description copied from interface: RichIterable
    Returns all elements of the source collection that return true when evaluating the predicate. This method is also commonly called filter.
    Example using a Java 8 lambda expression:
    RichIterable<Person> selected = people.select(person -> person.getAddress().getCity().equals("London"));
    Specified by:
    
    select in interface ImmutableCollection<T>
    
    Specified by:
    
    select in interface ImmutableSetIterable<T>
    
    Specified by:
    
    select in interface RichIterable<T>
    
    Specified by:
    
    select in interface SetIterable<T>
    
    Specified by:
    
    select in interface UnsortedSetIterable<T>
  - selectWith
```
<P> ImmutableSet<T> selectWith(Predicate2<? super T,? super P> predicate,
                               P parameter)
```
    Description copied from interface: RichIterable
    Similar to RichIterable.select(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.
    E.g. return a Collection of Person elements where the person has an age greater than or equal to 18 years
    Example using a Java 8 lambda expression:
    RichIterable<Person> selected = people.selectWith((Person person, Integer age) -> person.getAge()>= age, Integer.valueOf(18));
    Specified by:
    
    selectWith in interface ImmutableCollection<T>
    
    Specified by:
    
    selectWith in interface ImmutableSetIterable<T>
    
    Specified by:
    
    selectWith in interface RichIterable<T>
    
    Specified by:
    
    selectWith in interface SetIterable<T>
    
    Specified by:
    
    selectWith in interface UnsortedSetIterable<T>
    
    Parameters:
    
    predicate - a Predicate2 to use as the select criteria
    
    parameter - a parameter to pass in for evaluation of the second argument P in predicate
    
    See Also:
    
    RichIterable.select(Predicate)
  - reject
```
ImmutableSet<T> reject(Predicate<? super T> predicate)
```
    Description copied from interface: RichIterable
    Returns all elements of the source collection that return false when evaluating of the predicate. This method is also sometimes called filterNot and is the equivalent of calling iterable.select(Predicates.not(predicate)).
    Example using a Java 8 lambda expression:
    RichIterable<Person> rejected = people.reject(person -> person.person.getLastName().equals("Smith"));
    Specified by:
    
    reject in interface ImmutableCollection<T>
    
    Specified by:
    
    reject in interface ImmutableSetIterable<T>
    
    Specified by:
    
    reject in interface RichIterable<T>
    
    Specified by:
    
    reject in interface SetIterable<T>
    
    Specified by:
    
    reject in interface UnsortedSetIterable<T>
    
    Parameters:
    
    predicate - a Predicate to use as the reject criteria
    
    Returns:
    
    a RichIterable that contains elements that cause Predicate.accept(Object) method to evaluate to false
  - rejectWith
```
<P> ImmutableSet<T> rejectWith(Predicate2<? super T,? super P> predicate,
                               P parameter)
```
    Description copied from interface: RichIterable
    Similar to RichIterable.reject(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.
    E.g. return a Collection of Person elements where the person has an age greater than or equal to 18 years
    Example using a Java 8 lambda expression:
    RichIterable<Person> rejected = people.rejectWith((Person person, Integer age) -> person.getAge() < age, Integer.valueOf(18));
    Specified by:
    
    rejectWith in interface ImmutableCollection<T>
    
    Specified by:
    
    rejectWith in interface ImmutableSetIterable<T>
    
    Specified by:
    
    rejectWith in interface RichIterable<T>
    
    Specified by:
    
    rejectWith in interface SetIterable<T>
    
    Specified by:
    
    rejectWith in interface UnsortedSetIterable<T>
    
    Parameters:
    
    predicate - a Predicate2 to use as the select criteria
    
    parameter - a parameter to pass in for evaluation of the second argument P in predicate
    
    See Also:
    
    RichIterable.select(Predicate)
  - partition
```
PartitionImmutableSet<T> partition(Predicate<? super T> predicate)
```
    Description copied from interface: RichIterable
    Filters a collection into a PartitionedIterable based on the evaluation of the predicate.
    Example using a Java 8 lambda expression:
    PartitionIterable<Person> newYorkersAndNonNewYorkers = people.partition(person -> person.getAddress().getState().getName().equals("New York"));
    Specified by:
    
    partition in interface ImmutableCollection<T>
    
    Specified by:
    
    partition in interface ImmutableSetIterable<T>
    
    Specified by:
    
    partition in interface RichIterable<T>
    
    Specified by:
    
    partition in interface SetIterable<T>
  - partitionWith
```
<P> PartitionImmutableSet<T> partitionWith(Predicate2<? super T,? super P> predicate,
                                           P parameter)
```
    Description copied from interface: RichIterable
    Filters a collection into a PartitionIterable based on the evaluation of the predicate.
    Example using a Java 8 lambda expression:
    PartitionIterable<Person> newYorkersAndNonNewYorkers = people.partitionWith((Person person, String state) -> person.getAddress().getState().getName().equals(state), "New York");
    Specified by:
    
    partitionWith in interface ImmutableCollection<T>
    
    Specified by:
    
    partitionWith in interface ImmutableSetIterable<T>
    
    Specified by:
    
    partitionWith in interface RichIterable<T>
    
    Specified by:
    
    partitionWith in interface SetIterable<T>
  - selectInstancesOf
```
<S> ImmutableSet<S> selectInstancesOf(Class<S> clazz)
```
    Description copied from interface: RichIterable
    Returns all elements of the source collection that are instances of the Class clazz.
    RichIterable<Integer> integers = List.mutable.with(new Integer(0), new Long(0L), new Double(0.0)).selectInstancesOf(Integer.class);
    Specified by:
    
    selectInstancesOf in interface ImmutableCollection<T>
    
    Specified by:
    
    selectInstancesOf in interface ImmutableSetIterable<T>
    
    Specified by:
    
    selectInstancesOf in interface RichIterable<T>
    
    Specified by:
    
    selectInstancesOf in interface SetIterable<T>
    
    Specified by:
    
    selectInstancesOf in interface UnsortedSetIterable<T>
  - collect
```
<V> ImmutableSet<V> collect(Function<? super T,? extends V> function)
```
    Description copied from interface: RichIterable
    Returns a new collection with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    RichIterable<String> names = people.collect(person -> person.getFirstName() + " " + person.getLastName());
    Specified by:
    
    collect in interface ImmutableCollection<T>
    
    Specified by:
    
    collect in interface RichIterable<T>
    
    Specified by:
    
    collect in interface UnsortedSetIterable<T>
  - collectBoolean
```
ImmutableBooleanSet collectBoolean(BooleanFunction<? super T> booleanFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive boolean iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    BooleanIterable licenses = people.collectBoolean(person -> person.hasDrivingLicense());
    Specified by:
    
    collectBoolean in interface ImmutableCollection<T>
    
    Specified by:
    
    collectBoolean in interface RichIterable<T>
    
    Specified by:
    
    collectBoolean in interface UnsortedSetIterable<T>
  - collectByte
```
ImmutableByteSet collectByte(ByteFunction<? super T> byteFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive byte iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    ByteIterable bytes = people.collectByte(person -> person.getCode());
    Specified by:
    
    collectByte in interface ImmutableCollection<T>
    
    Specified by:
    
    collectByte in interface RichIterable<T>
    
    Specified by:
    
    collectByte in interface UnsortedSetIterable<T>
  - collectChar
```
ImmutableCharSet collectChar(CharFunction<? super T> charFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive char iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    CharIterable chars = people.collectChar(person -> person.getMiddleInitial());
    Specified by:
    
    collectChar in interface ImmutableCollection<T>
    
    Specified by:
    
    collectChar in interface RichIterable<T>
    
    Specified by:
    
    collectChar in interface UnsortedSetIterable<T>
  - collectDouble
```
ImmutableDoubleSet collectDouble(DoubleFunction<? super T> doubleFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive double iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    DoubleIterable doubles = people.collectDouble(person -> person.getMilesFromNorthPole());
    Specified by:
    
    collectDouble in interface ImmutableCollection<T>
    
    Specified by:
    
    collectDouble in interface RichIterable<T>
    
    Specified by:
    
    collectDouble in interface UnsortedSetIterable<T>
  - collectFloat
```
ImmutableFloatSet collectFloat(FloatFunction<? super T> floatFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive float iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    FloatIterable floats = people.collectFloat(person -> person.getHeightInInches());
    Specified by:
    
    collectFloat in interface ImmutableCollection<T>
    
    Specified by:
    
    collectFloat in interface RichIterable<T>
    
    Specified by:
    
    collectFloat in interface UnsortedSetIterable<T>
  - collectInt
```
ImmutableIntSet collectInt(IntFunction<? super T> intFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive int iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    IntIterable ints = people.collectInt(person -> person.getAge());
    Specified by:
    
    collectInt in interface ImmutableCollection<T>
    
    Specified by:
    
    collectInt in interface RichIterable<T>
    
    Specified by:
    
    collectInt in interface UnsortedSetIterable<T>
  - collectLong
```
ImmutableLongSet collectLong(LongFunction<? super T> longFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive long iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    LongIterable longs = people.collectLong(person -> person.getGuid());
    Specified by:
    
    collectLong in interface ImmutableCollection<T>
    
    Specified by:
    
    collectLong in interface RichIterable<T>
    
    Specified by:
    
    collectLong in interface UnsortedSetIterable<T>
  - collectShort
```
ImmutableShortSet collectShort(ShortFunction<? super T> shortFunction)
```
    Description copied from interface: RichIterable
    Returns a new primitive short iterable with the results of applying the specified function on each element of the source collection. This method is also commonly called transform or map.
    Example using a Java 8 lambda expression:
    ShortIterable shorts = people.collectShort(person -> person.getNumberOfJunkMailItemsReceivedPerMonth());
    Specified by:
    
    collectShort in interface ImmutableCollection<T>
    
    Specified by:
    
    collectShort in interface RichIterable<T>
    
    Specified by:
    
    collectShort in interface UnsortedSetIterable<T>
  - collectWith
```
<P,V> ImmutableSet<V> collectWith(Function2<? super T,? super P,? extends V> function,
                                        P parameter)
```
    Description copied from interface: RichIterable
    Same as RichIterable.collect(Function) with a Function2 and specified parameter which is passed to the block.
    Example using a Java 8 lambda expression:
    RichIterable<Integer> integers = Lists.mutable.with(1, 2, 3).collectWith((each, parameter) -> each + parameter, Integer.valueOf(1));
    Specified by:
    
    collectWith in interface ImmutableCollection<T>
    
    Specified by:
    
    collectWith in interface RichIterable<T>
    
    Specified by:
    
    collectWith in interface UnsortedSetIterable<T>
    
    Parameters:
    
    function - A Function2 to use as the collect transformation function
    
    parameter - A parameter to pass in for evaluation of the second argument P in function
    
    Returns:
    
    A new RichIterable that contains the transformed elements returned by Function2.value(Object, Object)
    
    See Also:
    
    RichIterable.collect(Function)
  - collectIf
```
<V> ImmutableSet<V> collectIf(Predicate<? super T> predicate,
                              Function<? super T,? extends V> function)
```
    Description copied from interface: RichIterable
    Returns a new collection with the results of applying the specified function on each element of the source collection, but only for those elements which return true upon evaluation of the predicate. This is the optimized equivalent of calling iterable.select(predicate).collect(function).
    Example using a Java 8 lambda and method reference:
    RichIterable<String> strings = Lists.mutable.with(1, 2, 3).collectIf(e -> e != null, Object::toString);
    
    Example using Predicates factory:
    RichIterable<String> strings = Lists.mutable.with(1, 2, 3).collectIf(Predicates.notNull(), Functions.getToString());
    Specified by:
    
    collectIf in interface ImmutableCollection<T>
    
    Specified by:
    
    collectIf in interface RichIterable<T>
    
    Specified by:
    
    collectIf in interface UnsortedSetIterable<T>
  - flatCollect
```
<V> ImmutableSet<V> flatCollect(Function<? super T,? extends Iterable<V>> function)
```
    Description copied from interface: RichIterable
    flatCollect is a special case of RichIterable.collect(Function). With collect, when the Function returns a collection, the result is a collection of collections. flatCollect outputs a single "flattened" collection instead. This method is commonly called flatMap.
    Consider the following example where we have a Person class, and each Person has a list of Address objects. Take the following Function:
    Function<Person, List<Address>> addressFunction = Person::getAddresses; RichIterable<Person> people = ...;
    Using collect returns a collection of collections of addresses.
    RichIterable<List<Address>> addresses = people.collect(addressFunction);
    Using flatCollect returns a single flattened list of addresses.
    RichIterable<Address> addresses = people.flatCollect(addressFunction);
    Specified by:
    
    flatCollect in interface ImmutableCollection<T>
    
    Specified by:
    
    flatCollect in interface RichIterable<T>
    
    Specified by:
    
    flatCollect in interface UnsortedSetIterable<T>
    
    Parameters:
    
    function - The Function to apply
    
    Returns:
    
    a new flattened collection produced by applying the given function
  - flatCollectWith
```
default <P,V> ImmutableSet<V> flatCollectWith(Function2<? super T,? super P,? extends Iterable<V>> function,
                                                    P parameter)
```
    Specified by:
    
    flatCollectWith in interface ImmutableCollection<T>
    
    Specified by:
    
    flatCollectWith in interface RichIterable<T>
    
    Specified by:
    
    flatCollectWith in interface UnsortedSetIterable<T>
    
    Since:
    
    9.2
  - groupBy
```
<V> ImmutableSetMultimap<V,T> groupBy(Function<? super T,? extends V> function)
```
    Description copied from interface: RichIterable
    For each element of the iterable, the function is evaluated and the results of these evaluations are collected into a new multimap, where the transformed value is the key and the original values are added to the same (or similar) species of collection as the source iterable.
    Example using a Java 8 method reference:
    Multimap<String, Person> peopleByLastName = people.groupBy(Person::getLastName);
    Specified by:
    
    groupBy in interface ImmutableCollection<T>
    
    Specified by:
    
    groupBy in interface ImmutableSetIterable<T>
    
    Specified by:
    
    groupBy in interface RichIterable<T>
    
    Specified by:
    
    groupBy in interface UnsortedSetIterable<T>
  - groupByEach
```
<V> ImmutableSetMultimap<V,T> groupByEach(Function<? super T,? extends Iterable<V>> function)
```
    Description copied from interface: RichIterable
    
    Similar to RichIterable.groupBy(Function), except the result of evaluating function will return a collection of keys for each value.
    
    Specified by:
    
    groupByEach in interface ImmutableCollection<T>
    
    Specified by:
    
    groupByEach in interface ImmutableSetIterable<T>
    
    Specified by:
    
    groupByEach in interface RichIterable<T>
    
    Specified by:
    
    groupByEach in interface UnsortedSetIterable<T>
  - zip
```
@Deprecated
<S> ImmutableSet<Pair<T,S>> zip(Iterable<S> that)
```
    Deprecated.
    in 6.0. Use OrderedIterable.zip(Iterable) instead.
    
    Description copied from interface: RichIterable
    
    Returns a RichIterable formed from this RichIterable and another RichIterable by combining corresponding elements in pairs. If one of the two RichIterables is longer than the other, its remaining elements are ignored.
    
    Specified by:
    
    zip in interface ImmutableCollection<T>
    
    Specified by:
    
    zip in interface RichIterable<T>
    
    Specified by:
    
    zip in interface UnsortedSetIterable<T>
    
    Type Parameters:
    
    S - the type of the second half of the returned pairs
    
    Parameters:
    
    that - The RichIterable providing the second half of each result pair
    
    Returns:
    
    A new RichIterable containing pairs consisting of corresponding elements of this RichIterable and that. The length of the returned RichIterable is the minimum of the lengths of this RichIterable and that.
  - zipWithIndex
```
@Deprecated
ImmutableSet<Pair<T,Integer>> zipWithIndex()
```
    Deprecated.
    in 6.0. Use OrderedIterable.zipWithIndex() instead.
    
    Description copied from interface: RichIterable
    
    Zips this RichIterable with its indices.
    
    Specified by:
    
    zipWithIndex in interface ImmutableCollection<T>
    
    Specified by:
    
    zipWithIndex in interface ImmutableSetIterable<T>
    
    Specified by:
    
    zipWithIndex in interface RichIterable<T>
    
    Specified by:
    
    zipWithIndex in interface SetIterable<T>
    
    Specified by:
    
    zipWithIndex in interface UnsortedSetIterable<T>
    
    Returns:
    
    A new RichIterable containing pairs consisting of all elements of this RichIterable paired with their index. Indices start at 0.
    
    See Also:
    
    RichIterable.zip(Iterable)
  - castToSet
```
Set<T> castToSet()
```
  - union
```
ImmutableSet<T> union(SetIterable<? extends T> set)
```
    Description copied from interface: SetIterable
    
    Returns the set of all objects that are a member of this or set or both. The union of [1, 2, 3] and [2, 3, 4] is the set [1, 2, 3, 4]. If equal elements appear in both sets, then the output will contain the copy from this.
    
    Specified by:
    
    union in interface SetIterable<T>
    
    Specified by:
    
    union in interface UnsortedSetIterable<T>
  - intersect
```
ImmutableSet<T> intersect(SetIterable<? extends T> set)
```
    Description copied from interface: SetIterable
    
    Returns the set of all objects that are members of both this and set. The intersection of [1, 2, 3] and [2, 3, 4] is the set [2, 3]. The output will contain instances from this, not set.
    
    Specified by:
    
    intersect in interface SetIterable<T>
    
    Specified by:
    
    intersect in interface UnsortedSetIterable<T>
  - difference
```
ImmutableSet<T> difference(SetIterable<? extends T> subtrahendSet)
```
    Description copied from interface: SetIterable
    
    Returns the set of all members of this that are not members of subtrahendSet. The difference of [1, 2, 3] and [2, 3, 4] is [1].
    
    Specified by:
    
    difference in interface SetIterable<T>
    
    Specified by:
    
    difference in interface UnsortedSetIterable<T>
  - symmetricDifference
```
ImmutableSet<T> symmetricDifference(SetIterable<? extends T> setB)
```
    Description copied from interface: SetIterable
    
    Returns the set of all objects that are a member of exactly one of this and setB (elements which are in one of the sets, but not in both). For instance, for the sets [1, 2, 3] and [2, 3, 4], the symmetric difference set is [1, 4] . It is the set difference of the union and the intersection.
    
    Specified by:
    
    symmetricDifference in interface SetIterable<T>
    
    Specified by:
    
    symmetricDifference in interface UnsortedSetIterable<T>
  - powerSet
```
ImmutableSet<UnsortedSetIterable<T>> powerSet()
```
    Description copied from interface: UnsortedSetIterable
    
    Returns the set whose members are all possible subsets of this. For example, the powerset of [1, 2] is [[], [1], [2], [1, 2]].
    
    Specified by:
    
    powerSet in interface UnsortedSetIterable<T>
  - toImmutableSet
```
default ImmutableSet<T> toImmutableSet()
```
    Overrides toImmutableSet in RichIterable to return this.
    
    Specified by:
    
    toImmutableSet in interface RichIterable<T>
    
    Since:
    
    11.0

Interface ImmutableSet<T>

Method Summary

Methods inherited from interface org.eclipse.collections.api.collection.ImmutableCollection

Methods inherited from interface org.eclipse.collections.api.InternalIterable

Methods inherited from interface java.lang.Iterable

Methods inherited from interface org.eclipse.collections.api.RichIterable

Methods inherited from interface org.eclipse.collections.api.set.SetIterable

Methods inherited from interface org.eclipse.collections.api.set.UnsortedSetIterable

Method Detail

newWith

newWithout

newWithAll

newWithoutAll

tap

select

selectWith

reject

rejectWith

partition

partitionWith

selectInstancesOf

collect

collectBoolean

collectByte

collectChar

collectDouble

collectFloat

collectInt

collectLong

collectShort

collectWith

collectIf

flatCollect

flatCollectWith

groupBy

groupByEach

zip

zipWithIndex

castToSet

union

intersect

difference

symmetricDifference

powerSet

toImmutableSet