Dart Runes

In this tutorial you will learn about the Dart Runes and its application with practical example.

Dart Runes

String is used to hold sequence of characters – letters, numbers, and special characters. In Dart, string is represented as sequence of Unicode UTF-16 characters. If you want to use 32-bit Unicode characters within a string then it must be represented using a special syntax. A rune is an integer representing a Unicode code point. For example, the heart character ‘♥ is represented using corresponding unicode equivalent \u2665, here \u stands for unicode and the numbers are hexadecimal, which is essentially an integer. If the hex digits are more or less than 4 digits, place the hex value in curly brackets ({ }). For example, the laughing emoji ‘😆’ is represented as \u{1f600}.

Example:-

Output:-

Runes can be accessed using the String class available in dart:core library. The String code units / runes can be accessed in following three ways –

  • Using String.codeUnitAt() function
  • Using String.codeUnits property
  • Using String.runes property

String.codeUnitAt() Function

The Code units of a character in a string can be accessed through their indexes. The codeUnitAt() function returns the 16-bit UTF-16 code unit at the given index.

Syntax:-

Example:-

Output:-

dart_codeunitat_function_example

String.codeUnits Property

The codeUnits property returns a list of UTF-16 code units for specified string.

Recommended:-  Dart Basic Syntax

Syntax:-

Example:-

Output:-

dart_codeunits_property

String.runes Property

This runes property iterate through the UTF-16 code units in a given string.

Syntax:-

Example:-

Output:-

dart_string_runes_property_example

In this tutorial we have learn about the Dart Runes and its application with practical example. I hope you will like this tutorial.