Runes class - dart:core library (original) (raw)
The runes (integer Unicode code points) of a String.
The characters of a string are encoded in UTF-16. Decoding UTF-16, which combines surrogate pairs, yields Unicode code points. Following a similar terminology to Go, Dart uses the name 'rune' for an integer representing a Unicode code point. Use the runes property to get the runes of a string.
Example:
const string = 'Dart';
final runes = string.runes.toList();
print(runes); // [68, 97, 114, 116]
For a character outside the Basic Multilingual Plane (plane 0) that is composed of a surrogate pair, runes combines the pair and returns a single integer.
For example, the Unicode character for "Man" emoji ('👨', U+1F468) is combined from the surrogates U+d83d and U+dc68.
Example:
const emojiMan = '👨';
print(emojiMan.runes); // (128104)
// Surrogate pairs:
for (final item in emojiMan.codeUnits) {
print(item.toRadixString(16));
// d83d
// dc68
}
See also:
Inheritance
Constructors
Creates a Runes iterator for string.
Properties
The first element.
no setterinherited
The hash code for this object.
no setterinherited
Whether this collection has no elements.
no setterinherited
isNotEmpty → bool
Whether this collection has at least one element.
no setterinherited
iterator → RuneIterator
A new Iterator that allows iterating the elements of this Iterable.
no setteroverride
The last element.
no setteroverride
The number of elements in this Iterable.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
Checks that this iterable has only one element, and returns that element.
no setterinherited
The string that this is the runes of.
final
Methods
any(bool test(int element))→ bool
Checks whether any element of this iterable satisfies test.
inherited
A view of this iterable as an iterable of R instances.
inherited
contains(Object? element)→ bool
Whether the collection contains an element equal to element.
inherited
Returns the indexth element.
inherited
every(bool test(int element))→ bool
Checks whether every element of this iterable satisfies test.
inherited
expand<T>(Iterable<T> toElements(int element))→ Iterable<T>
Expands each element of this Iterable into zero or more elements.
inherited
firstWhere(bool test(int element), {int orElse()?})→ int
The first element that satisfies the given predicate test.
inherited
fold<T>(T initialValue, T combine(T previousValue, int element))→ T
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value
inherited
followedBy(Iterable<int> other)→ Iterable<int>
Creates the lazy concatenation of this iterable and other.
inherited
forEach(void action(int element))→ void
Invokes action on each element of this iterable in iteration order.
inherited
join([String separator = ""])→ String
Converts each element to a String and concatenates the strings.
inherited
lastWhere(bool test(int element), {int orElse()?})→ int
The last element that satisfies the given predicate test.
inherited
map<T>(T toElement(int 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(int combine(int value, int element))→ int
Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.
inherited
singleWhere(bool test(int element), {int orElse()?})→ int
The single element that satisfies test.
inherited
skip(int count)→ Iterable<int>
Creates an Iterable that provides all but the first count elements.
inherited
skipWhile(bool test(int value))→ Iterable<int>
Creates an Iterable that skips leading elements while test is satisfied.
inherited
take(int count)→ Iterable<int>
Creates a lazy iterable of the count first elements of this iterable.
inherited
takeWhile(bool test(int value))→ Iterable<int>
Creates a lazy iterable of the leading elements satisfying test.
inherited
toList({bool growable = true})→ List<int>
Creates a List containing the elements of this Iterable.
inherited
Creates a Set containing the same elements as this iterable.
inherited
Returns a string representation of (some of) the elements of this.
inherited
where(bool test(int element))→ Iterable<int>
Creates a new lazy Iterable with all elements that satisfy the predicate test.
inherited
Creates a new lazy Iterable with all elements that have type T.
inherited
Operators
operator ==(Object other)→ bool
The equality operator.
inherited