Dart Programming Examples

Dart Programming - HashSet

dart

import 'dart:collection'; 
void main() { 
   Set numberSet = new  HashSet(); 
   numberSet.add(100); 
   numberSet.add(20); 
   numberSet.add(5); 
   numberSet.add(60); 
   numberSet.add(70); 
   print("Default implementation :${numberSet.runtimeType}"); 
   for(var no in numberSet){ 
      print(no); 
   }
}

Dart Programming - Removing Values from a HashMap

dart

import 'dart:collection'; 
main() { 
   var accounts = new HashMap(); 
   accounts['dept'] = 'HR'; 
   accounts['name'] = 'Tom'; 
   accounts['email'] = '[email protected]'; 
   print('Map after adding  entries :${accounts}');
   accounts.remove('dept'); 
   print('Map after removing  entry :${accounts}');  
   accounts.clear(); 
   print('Map after clearing entries :${accounts}'); 
}

Dart Programming - Adding Multiple Values to a HashMap

dart

import 'dart:collection'; 
main() { 
   var accounts = new HashMap(); 
   accounts.addAll({'dept':'HR','email':'[email protected]'}); 
   print('Map after adding  entries :${accounts}'); 
}

Dart Programming - HashMap

dart

import 'dart:collection'; 
main() { 
   var accounts = new HashMap(); 
   accounts['dept']='HR'; 
   accounts['name']='Tom'; 
   accounts['email']='[email protected]'; 
   print('Map after adding  entries :${accounts}'); 
}

Dart Programming - Illustration Set.from()

dart

void main() { 
   Set numberSet = new Set.from([12,13,14]); 
   print("Default implementation :${numberSet.runtimeType}");  
   // all elements are retrieved in the order in which they are inserted 
   for(var no in numberSet) { 
      print(no); 
   } 
}

Dart Programming - Collection Set

dart

void main() { 
   Set numberSet = new  Set(); 
   numberSet.add(100); 
   numberSet.add(20); 
   numberSet.add(5); 
   numberSet.add(60); 
   numberSet.add(70);
   print("Default implementation :${numberSet.runtimeType}");  
   // all elements are retrieved in the order in which they are inserted 
   for(var no in numberSet) { 
      print(no); 
   } 
}

Dart Programming - Collection List

dart

void main() { 
   List logTypes = new List(); 
   logTypes.add("WARNING"); 
   logTypes.add("ERROR"); 
   logTypes.add("INFO");  
   // iterating across list 
   for(String type in logTypes){ 
      print(type); 
   } 
   // printing size of the list 
   print(logTypes.length); 
   logTypes.remove("WARNING"); 
   print("size after removing."); 
   print(logTypes.length); 
}

Dart Programming - Iterating Collections

dart

import 'dart:collection'; 
void main() { 
   Queue numQ = new Queue(); 
   numQ.addAll([100,200,300]);  
   Iterator i= numQ.iterator; 
   while(i.moveNext()) { 
      print(i.current); 
   } 
}

Dart Programming - toString() method

dart

void main() { 
   int n = 12; 
   print(n.toString()); 
}

Dart Programming - Cascade operator (..)

dart

class Student { 
   void test_method() { 
      print("This is a  test method"); 
   } 
   
   void test_method1() { 
      print("This is a  test method1"); 
   } 
}  
void main() { 
   new Student() 
   ..test_method() 
   ..test_method1(); 
}

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