Dart Tutorial

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Data Types

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Other data types

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OPERATORS

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Control Flow Statements

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FUNCTIONS

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Dart Type System

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MISCELLANEOUS

Dart Isolates Dart Typedef Dart Metadata Dart Packages Dart Generics Dart Generators Dart Concurrency Dart Unit Testing Dart Html Dom Dart URIs Dart Extends, With and Implements Keywords Dart Optional Parameters Rust Vs Dart C++ vs Dart Golang Vs Dart Dart Basics Exception Handling

Dart Symbols
2022-04-21 10:15:50

Dart Symbols

Symbols data type in Dart

A symbol is an object that is the representation of an operator or identifier in Dart. These are compile-time constants. 

They are used in APIs that refer to identifiers by name. 

Example, 

#radix

Dart symbols are the dynamic strings that are used to derive metadata from a library. Metadata is the data about data. The symbol uses a technique called Reflection to derive the metadata at runtime. 

Conversion of Symbol to String

Dart symbols can be converted to their equivalent string using the built – in class MirrorClass provided by the 'dart:mirror' package. 

Program

import 'dart: mirrors'; 
void main( )
{ 
  Symbol lib = new Symbol( "<sym_lib>" ) ; 
  String name_of_lib = MirrorSystem.getName( lib ) ; 
   
  print( lib ) ; 
  print( name_of_lib ) ; 
} 

Output:

Dart Symbols