DART MAP Map<String, int> phoneBook ={ 'kyle': 98765698754, 'oper': 1234567998, 'asdf': 98754336779, }; main(){ phoneBook['anshu'] = 1234567890; // to add new key and value print(phoneBook['kyle']); }
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DART ENUM used for making user defined datatypes e.g. enum Car { suv, hatchback, coupe, luxury } Now Car become a user datatypes and this contain these above names call Car.suv , Car.coupe etc. In any func. we may write like Car cartype here cartype is variable under Car datatypes DART TERNARY OPERATOR Replacement for if else statement if( cond. ) { .cond true then if runs................. } else { cond. rong then else } TERNARY OPERATOR SYNTAX ...
Refractor Same code of widget in different widget can be shorten by making new widget by refractor example Container ( margin: EdgeInsets . all ( 15 ) , decoration: BoxDecoration ( color: Color ( 0xFF1d1f33 ) , borderRadius: BorderRadius . circular ( 12 ) , this above code is used multiple times in different widget so we use refractor then by refractor we can name new widget replacing this above code example -- ReusableCard () , by Refracting, this code made by android studio A Key is an identifier for Widget s, Element s and SemanticsNode s. class ReusableCard extends StatelessWidget { const ReusableCard({ Key key , }) : super (key: key) ; @override Widget build (BuildContext context) { return Container ( margin: EdgeInsets . all ( 15 ) , decoration: BoxDecoration ( color: Color ( 0xFF1d1f33 ) , borderRadius: BorderRadius . circular ( 12 ) , ) , ) ; } }
ThemeData class theme: ThemeData( primaryColor: Colors.blue, accentColor: Colors.green, textTheme: TextTheme(bodyText2: TextStyle(color: Colors.purple)), ), and many other properties in this. for whole app theme: ThemeData . dark ().copyWith( // c opywith for showing body text we primaryColor: Color ( 0xFF0a0d22 ) , can also take only themedata scaffoldBackgroundColor: Color ( 0xFF090c21 ) , ) , For particular icon floatingActionButton: Theme ( data: ThemeData ( accentColor: Colors. purple , ) , child: FloatingActionButton ( child: Icon (Icons. add ) , ) , ) ,
Classes and Objects classes are blueprint . Name of Classes starts with capital letter. classes have i)properties ii)Methods - functions in Class Example Object of class classes and objects void main(){ Human jenny = Human(15); // here we created jenny as object in class of Human print(jenny.height); jenny.talk('Why gods create this universe'); } class Human { double height; int age = 0; Human(double startingHeight){ height = startingHeight; } void talk(String whatTosay){ // talk is method and call of method as shown above print(whatTosay); } } Inheritance we can create more classes based on another class or we simply say that this we can create class which has inherited property and method from oth...
LIST IN DART void main(){ List myList = ['Vanya' , 'rogersville', 'Harshi' , 'zxcvbnm', 'qwertyio']; print(myList[2]); print(myList.indexOf('Harshi')); myList.add('asdfghjkl'); // to add new value myList.insert(2,'lkjhg'); // to add value at specific index print(myList); myList. // various option are available , see when you write like this } do list ko banakar, we can compare like question and answer lists and match them Conditional statement import 'dart:math'; void main(){ loveCalculator(); } void loveCalculator(){ int loveScore = Random().nextInt(100) + 1 ; print(loveScore); if(loveScore > 80 && loveScore < 90){ print('True love'); } if(loveScore > 90){ print('Pure Love'); } else{ print('only attraction'); } } Conditional 'if statement' , 'if-else' , ' i...