Methods in Dart Runes
Dart also has Methods for manipulating Runes that have been built. Below some significant methods are listed.
- any(bool test(int element)): Checks if any of the elements in this iterable pass the test.
- contains(Object? element): Returns boolean(true) if the collection includes an element with the same value as the element.
- elementAt(int index): Element at int index is returned.
- every(bool test(int element)): Checks if each element of this iterable passes the condition.
- expand<T>(Iterable<T> toElements(int element)) : Checks if each element of this iterable passes the condition.
- firstWhere(bool test(int element), {int orElse()?}): The first element that passes the given predicate test is returned.
- fold<T>(T initialValue, T combine(T previousValue, int element)): Iteratively combines each element of the collection with an existing value to reduce a collection to a single value.
- followedBy(Iterable<int> other): The lazy concatenation of this(int) iterable and other is returned.
- forEach(void action(int element)): Invokes action on each element of this iterable in the sequence in which it was created.
- join([String separator = ""]): Each element is converted to a String, and the strings are concatenated.
- lastWhere(bool test(int element), {int orElse()?}): The final element that passes the provided predicate test is returned.
- map<T>(T toElement(int e)): toElement modifies the current elements of this iterable.
- skipWhile(bool test(int value)): While the test is met, it returns an Iterable that skips the leading components.
- take(int count): Returns a lazy iterable of this iterable's count first elements.
- takeWhile(bool test(int value)): This method returns a lazy iterable of the leading components that pass the test.
- toList({bool growable = true}): This Iterable's elements are collected into a list.
- toSet(): This method creates a set with the same elements as this iterable.
- where(bool test(int element)): Returns a new lazy Iterable that contains all of the elements that pass the predicate test.
- whereType<T>(): Returns a new lazy Iterable containing all T-type items.
Accessing Runes
The dart:core library's String class provides access to runes. The following methods can be utilized to obtain runes:
- Using the property String.codeUnits
- Using the property String.runes
- Using the function String.codeUnitAt()
Using String.codeUnits Property
This property returns an immutable list of the given string's 16-bit UTF-16 code units.
Syntax:
Str_name.codeUnits;
Let us see this property with an example given below.
Code:
import 'dart:core';
main(){
String codingNinjas = 'Coding Ninjas Studio';
print(codingNinjas.codeUnits);
}
Output:
[67, 111, 100, 101, 83, 116, 117, 100, 105, 111]
Using String.runes Property
Iterable is extended by String.runes. This property delivers an iterable of the provided string's Unicode code points.
Syntax:
Str_name.runes;
Let us see this property, too, with an example given below.
Code:
main(){
String str_name = "Coding Ninjas Studio";
str_name.runes.forEach((int i) {
var char = new String.fromCharCode(i);
print(char);
});
}
Output:
C
o
d
e
S
t
u
d
i
o
Using String.codeUnitAt() Function
It's used to get the UTF-16 code unit at the specified position in the string.
Syntax:
Str_name.codeUnitAt(int index);
Let us see this function’s use with an example given below.
Code:
import 'dart:core';
main(){
String my_str = 'Coding Ninjas StudioBlogs';
print(my_str.codeUnitAt(5));
}
Output:
116
Frequently Asked Questions
What is the code unit for the dart string?
Strings are represented in Dart as a series of Unicode UTF-16 code units. And because a Dart string is made up of UTF-16 code units, 32-bit Unicode values are expressed in the string using a specific syntax.
In Dart, what tool is used to format code?
The dart_style package defines a Dart code formatter that is both automatic and opinionated. It replaces the whitespace in our program with the best formatting it can think of.
How long are Dart strings actually?
Memory is the limit for the Dart native VM. (Regarding the size of integers, but on current hardware, 64-bit integers cannot be a limiting issue. Since on any contemporary 64-bit architecture, you can't have more than 2^64 bytes of memory.).
In Dart, what is the integer's default value?
Null will be the default value for integers in the Dart programming language.
Conclusion
In this article, we learned about Dart Runes, their access, and their methods with a working example.
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