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ListBase<E> class

Abstract implementation of a list.

ListBase can be used as a base class for implementing the List interface.

This class implements all read operations using only the length and operator[] and members. It implements write operations using those and add, length= and operator[]= Classes using this base class should implement those five operations.

NOTICE: For backwards compatibility reasons, there is a default implementation of add which only works for lists with a nullable element type. For list with a non-nullable element type, the add method must be implemented.

NOTICE: Forwarding just the four length and [] read/write operations to a normal growable List (as created by a [] literal) will give very bad performance for add and addAll operations of ListBase. These operations are implemented by increasing the length of the list by one for each add operation, and repeatedly increasing the length of a growable list is not efficient. To avoid this, override 'add' and 'addAll' to also forward directly to the growable list, or, if possible, use DelegatingList from "package:collection/collection.dart" instead of a ListMixin.

Mixed in types

ListMixin<E>

Implementers

Available Extensions

EnumByName

Constructors

ListBase()

Properties

first ↔ E read / write, inherited: Returns the first element.
hashCode → int read-only, inherited: The hash code for this object.
isEmpty → bool read-only, inherited: Whether this collection has no elements.
isNotEmpty → bool read-only, inherited: Whether this collection has at least one element.
iterator → Iterator<E> read-only, inherited: Returns a new Iterator that allows iterating the elements of this Iterable.
last ↔ E read / write, inherited: Returns the last element.
length ↔ int read / write, inherited: The number of objects in this list.
reversed → Iterable<E> read-only, inherited: An Iterable of the objects in this list in reverse order.
runtimeType → Type read-only, inherited: A representation of the runtime type of the object.
single → E read-only, inherited: Checks that this iterable has only one element, and returns that element.

Methods

add(E element) → void inherited: Adds value to the end of this list, extending the length by one.
addAll(Iterable<E> iterable) → void inherited: Appends all objects of iterable to the end of this list.
any(bool test(E element)) → bool inherited: Checks whether any element of this iterable satisfies test.
asMap() → Map<int, E> inherited: An unmodifiable Map view of this list.
cast<R>() → List<R> inherited: Returns a view of this list as a list of R instances.
clear() → void inherited: Removes all objects from this list; the length of the list becomes zero.
contains(Object? element) → bool inherited: Whether the collection contains an element equal to element.
elementAt(int index) → E inherited: Returns the indexth element.
every(bool test(E element)) → bool inherited: Checks whether every element of this iterable satisfies test.
expand<T>(Iterable<T> f(E element)) → Iterable<T> inherited: Expands each element of this Iterable into zero or more elements.
fillRange(int start, int end, [E? fill]) → void inherited: Overwrites a range of elements with fillValue.
firstWhere(bool test(E element), {E orElse()?}) → E inherited: Returns the first element that satisfies the given predicate test.
fold<T>(T initialValue, T combine(T previousValue, E element)) → T inherited: Reduces a collection to a single value by iteratively combining each element of the collection with an existing value
followedBy(Iterable<E> other) → Iterable<E> inherited: Returns the lazy concatenation of this iterable and other.
forEach(void action(E element)) → void inherited: Invokes action on each element of this iterable in iteration order.
getRange(int start, int end) → Iterable<E> inherited: Creates an Iterable that iterates over a range of elements.
indexOf(Object? element, [int start = 0]) → int inherited: The first index of element in this list.
indexWhere(bool test(E element), [int start = 0]) → int inherited: The first index in the list that satisfies the provided test.
insert(int index, E element) → void inherited: Inserts element at position index in this list.
insertAll(int index, Iterable<E> iterable) → void inherited: Inserts all objects of iterable at position index in this list.
join([String separator = ""]) → String inherited: Converts each element to a String and concatenates the strings.
lastIndexOf(Object? element, [int? start]) → int inherited: The last index of element in this list.
lastIndexWhere(bool test(E element), [int? start]) → int inherited: The last index in the list that satisfies the provided test.
lastWhere(bool test(E element), {E orElse()?}) → E inherited: Returns the last element that satisfies the given predicate test.
map<T>(T f(E element)) → Iterable<T> inherited: The current elements of this iterable modified by toElement.
noSuchMethod(Invocation invocation) → dynamic inherited: Invoked when a non-existent method or property is accessed.
reduce(E combine(E previousValue, E element)) → E inherited: Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.
remove(Object? element) → bool inherited: Removes the first occurrence of value from this list.
removeAt(int index) → E inherited: Removes the object at position index from this list.
removeLast() → E inherited: Removes and returns the last object in this list.
removeRange(int start, int end) → void inherited: Removes a range of elements from the list.
removeWhere(bool test(E element)) → void inherited: Removes all objects from this list that satisfy test.
replaceRange(int start, int end, Iterable<E> newContents) → void inherited: Replaces a range of elements with the elements of replacements.
retainWhere(bool test(E element)) → void inherited: Removes all objects from this list that fail to satisfy test.
setAll(int index, Iterable<E> iterable) → void inherited: Overwrites elements with the objects of iterable.
setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]) → void inherited: Writes some elements of iterable into a range of this list.
shuffle([Random? random]) → void inherited: Shuffles the elements of this list randomly.
singleWhere(bool test(E element), {E orElse()?}) → E inherited: Returns the single element that satisfies test.
skip(int count) → Iterable<E> inherited: Returns an Iterable that provides all but the first count elements.
skipWhile(bool test(E element)) → Iterable<E> inherited: Returns an Iterable that skips leading elements while test is satisfied.
sort([int compare(E a, E b)?]) → void inherited: Sorts this list according to the order specified by the compare function.
sublist(int start, [int? end]) → List<E> inherited: Returns a new list containing the elements between start and end.
take(int count) → Iterable<E> inherited: Returns a lazy iterable of the count first elements of this iterable.
takeWhile(bool test(E element)) → Iterable<E> inherited: Returns a lazy iterable of the leading elements satisfying test.
toList({bool growable = true}) → List<E> inherited: Creates a List containing the elements of this Iterable.
toSet() → Set<E> inherited: Creates a Set containing the same elements as this iterable.
toString() → String inherited: A string representation of this object.
where(bool test(E element)) → Iterable<E> inherited: Returns a new lazy Iterable with all elements that satisfy the predicate test.
whereType<T>() → Iterable<T> inherited: Returns a new lazy Iterable with all elements that have type T.

Operators

operator +(List<E> other) → List<E> inherited: Returns the concatenation of this list and other.
operator ==(Object other) → bool inherited: The equality operator.
operator [](int index) → E inherited: The object at the given index in the list.
operator []=(int index, E value) → void inherited: Sets the value at the given index in the list to value.

Static Methods

listToString(List list) → String: Converts a List to a String.

© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-collection/ListBase-class.html