Dart Runes

Dart Runes are the UTF-32 unicode points of a string.

Unicode values are nothing but Standard for representing characters as integers.

Unicode defines a unique number value for each letter, digit and used in all of the world’s popular languages(Writing Systems);

For ex :

0 to 9, Capital letters(A,B,…,Y,Z) etc. have unique Unicode values to identify easily by the Machine.

Rune is nothing but an integer representing unicode codepoint.

For ex :

Character A has Rune value \u{0041} and Unicode is U+0041.

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Different emojis, letters and also digits have unique unicode codepoints. which implies they also have unique Rune Values(code points).

we can express a Unicode code point as \uXXXX, where XXXX is a 4-digit hexidecimal value. and u stands for unicode.

For ex :

the heart character (?) is \u2665.

To specify more or less than 4 hex digits in Runes, place the value in curly brackets.

For ex :

the thumbsup emoji (??) is \u{1f44d}.

For ex :

void main()
 {

        Runes clapping = new Runes("\u{0050}");
        print(clapping);
        print(new String.fromCharCodes(clapping));

        Runes input = new Runes('\u2665  \u{1f605}  \u{1f60e}  \u{1f47b}  \u{1f596}  \u{1f44d}');
        print(new String.fromCharCodes(input));
}

Output :

(80)
P
? ?? ?? ?? ?? ??

In dart, string class has several properties and methods to extract the rune information.

Runes Common Properties

For ex :

main() {
  Runes clapping = new Runes("\u{0050}");
  Runes clappingData = new Runes("ABCD");
  print(clappingData.first);
  print(clappingData.last);

  print(clapping.single);
  print(clapping.hashCode);
  print(clapping.runtimeType);
  print(clapping.isEmpty);
  print(clapping.isNotEmpty);
  print(clapping.length);
}

Output :

65
68
80
31123396
Runes
false
true
1

Runes Common Methods

For ex :

main() {
  Runes clappingData = new Runes("ABCD");
  print(clappingData.toString());
  print(clappingData.skip(1));
  print(clappingData.contains("C"));
  print(clappingData.contains((67)));
  print(clappingData.toList());
  print(clappingData.toSet());
}

Output :

(65, 66, 67, 68)
(66, 67, 68)
false
true
[65, 66, 67, 68]
{65, 66, 67, 68}

Practice different properties and methods of dart runes by yourself to understand the better use of it.

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