Lookup<TKey, TValue> class

This is a utility class used by grouping Iterable methods and isn't intended to be instantiated directly.

Inheritance
Implemented types
Available Extensions

Properties

comparer EqualityComparer<TKey>
read / write
count int
read-only, override
first Grouping<TKey, TValue>
Returns the first element. [...]
read-only, inherited
groupings List<Grouping<TKey, TValue>>
read / write
hashCode int
The hash code for this object. [...]
read-only, inherited
isEmpty bool
Returns true if there are no elements in this collection. [...]
read-only, inherited
isNotEmpty bool
Returns true if there is at least one element in this collection. [...]
read-only, inherited
iterator Iterator<Grouping<TKey, TValue>>
Returns a new Iterator that allows iterating the elements of this Iterable. [...]
read-only, override
last Grouping<TKey, TValue>
Returns the last element. [...]
read-only, inherited
lastGrouping Grouping<TKey, TValue>
read / write
length int
Returns the number of elements in this. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
single Grouping<TKey, TValue>
Checks that this iterable has only one element, and returns that element. [...]
read-only, inherited

Methods

any(bool test(Grouping<TKey, TValue> element)) bool
Checks whether any element of this iterable satisfies test. [...]
inherited
applyResultSelector<TResult>(TResult resultSelector(TKey key, Iterable<TValue> group)) Iterable<TResult>
cast<R>() Iterable<R>
Provides a view of this iterable as an iterable of R instances. [...]
inherited
contains(Object element) bool
Returns true if the collection contains an element equal to element. [...]
inherited
containsKey(TKey key) bool
override
elementAt(int index) Grouping<TKey, TValue>
Returns the indexth element. [...]
inherited
every(bool test(Grouping<TKey, TValue> element)) bool
Checks whether every element of this iterable satisfies test. [...]
inherited
expand<T>(Iterable<T> f(Grouping<TKey, TValue> element)) Iterable<T>
Expands each element of this Iterable into zero or more elements. [...]
inherited
firstWhere(bool test(Grouping<TKey, TValue> element), {Grouping<TKey, TValue> orElse()}) Grouping<TKey, TValue>
Returns the first element that satisfies the given predicate test. [...]
inherited
fold<T>(T initialValue, T combine(T previousValue, Grouping<TKey, TValue> element)) → T
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value [...]
inherited
followedBy(Iterable<Grouping<TKey, TValue>> other) Iterable<Grouping<TKey, TValue>>
Returns the lazy concatentation of this iterable and other. [...]
inherited
forEach(void f(Grouping<TKey, TValue> element)) → void
Applies the function f to each element of this collection in iteration order.
inherited
getGrouping(TKey key, bool shouldCreate) Grouping<TKey, TValue>
iterate() Iterable<Grouping<TKey, TValue>>
join([String separator = ""]) String
Converts each element to a String and concatenates the strings. [...]
inherited
lastWhere(bool test(Grouping<TKey, TValue> element), {Grouping<TKey, TValue> orElse()}) Grouping<TKey, TValue>
Returns the last element that satisfies the given predicate test. [...]
inherited
map<T>(T f(Grouping<TKey, TValue> e)) Iterable<T>
Returns a new lazy Iterable with elements that are created by calling f on each element of this Iterable in iteration order. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
reduce(Grouping<TKey, TValue> combine(Grouping<TKey, TValue> value, Grouping<TKey, TValue> element)) Grouping<TKey, TValue>
Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. [...]
inherited
resizeBuffer() → void
singleWhere(bool test(Grouping<TKey, TValue> element), {Grouping<TKey, TValue> orElse()}) Grouping<TKey, TValue>
Returns the single element that satisfies test. [...]
inherited
skip(int count) Iterable<Grouping<TKey, TValue>>
Returns an Iterable that provides all but the first count elements. [...]
inherited
skipWhile(bool test(Grouping<TKey, TValue> value)) Iterable<Grouping<TKey, TValue>>
Returns an Iterable that skips leading elements while test is satisfied. [...]
inherited
take(int count) Iterable<Grouping<TKey, TValue>>
Returns a lazy iterable of the count first elements of this iterable. [...]
inherited
takeWhile(bool test(Grouping<TKey, TValue> value)) Iterable<Grouping<TKey, TValue>>
Returns a lazy iterable of the leading elements satisfying test. [...]
inherited
toList({bool growable: true}) List<Grouping<TKey, TValue>>
Creates a List containing the elements of this Iterable. [...]
inherited
toSet() Set<Grouping<TKey, TValue>>
Creates a Set containing the same elements as this iterable. [...]
inherited
toString() String
Returns a string representation of (some of) the elements of this. [...]
inherited
where(bool test(Grouping<TKey, TValue> element)) Iterable<Grouping<TKey, TValue>>
Returns a new lazy Iterable with all elements that satisfy the predicate test. [...]
inherited
whereType<T>() Iterable<T>
Returns a new lazy Iterable with all elements that have type T. [...]
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited
operator [](TKey key) Iterable<TValue>
override
operator []=(TKey key, TValue value) → void

Static Methods

create<TSource, TKey, TValue>(Iterable<TSource> source, TKey keySelector(TSource), TValue valueSelector(TSource), EqualityComparer<TKey> comparer) Lookup<TKey, TValue>
createForJoin<TKey, TValue>(Iterable<TValue> source, TKey keySelector(TValue), EqualityComparer<TKey> comparer) Lookup<TKey, TValue>
createFromMap<TKey, TValue>(Map<TKey, TValue> map, EqualityComparer<TKey> comparer) Lookup<TKey, TValue>