Lookup<TKey, TValue> class
This is a utility class used by grouping Iterable methods and isn't
intended to be instantiated directly.
Properties
-
comparer
↔ EqualityComparer<
TKey> -
getter/setter pair
- count → int
-
no setteroverride
-
first
→ Grouping<
TKey, TValue> -
The first element.
no setterinherited
-
groupings
↔ List<
Grouping< TKey, TValue> ?> -
getter/setter pair
- hashCode → int
-
The hash code for this object.
no setterinherited
- isEmpty → bool
-
Whether this collection has no elements.
no setterinherited
- isNotEmpty → bool
-
Whether this collection has at least one element.
no setterinherited
-
iterator
→ Iterator<
Grouping< TKey, TValue> > -
A new
Iteratorthat allows iterating the elements of thisIterable.no setteroverride -
last
→ Grouping<
TKey, TValue> -
The last element.
no setterinherited
-
lastGrouping
↔ Grouping<
TKey, TValue> ? -
getter/setter pair
- length → int
-
The number of elements in this Iterable.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
single
→ Grouping<
TKey, TValue> -
Checks that this iterable has only one element, and returns that element.
no setterinherited
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> -
A view of this iterable as an iterable of
Rinstances.inherited -
contains(
Object? element) → bool -
Whether 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> toElements(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> -
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< other) → Iterable<TKey, TValue> >Grouping< TKey, TValue> > -
Creates the lazy concatenation of this iterable and
other.inherited -
forEach(
void action(Grouping< TKey, TValue> element)) → void -
Invokes
actionon each element of this iterable 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> -
The last element that satisfies the given predicate
test.inherited -
map<
T> (T toElement(Grouping< TKey, TValue> e)) → Iterable<T> -
The current elements of this iterable modified by
toElement.inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent 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> -
The single element that satisfies
test.inherited -
skip(
int count) → Iterable< Grouping< TKey, TValue> > -
Creates an Iterable that provides all but the first
countelements.inherited -
skipWhile(
bool test(Grouping< TKey, TValue> value)) → Iterable<Grouping< TKey, TValue> > -
Creates an
Iterablethat skips leading elements whiletestis satisfied.inherited -
take(
int count) → Iterable< Grouping< TKey, TValue> > -
Creates a lazy iterable of the
countfirst elements of this iterable.inherited -
takeWhile(
bool test(Grouping< TKey, TValue> value)) → Iterable<Grouping< TKey, TValue> > -
Creates 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> > -
Creates a new lazy Iterable with all elements that satisfy the
predicate
test.inherited -
whereType<
T> () → Iterable< T> -
Creates 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>