Skip to content

Instantly share code, notes, and snippets.

@vishweshsoni

vishweshsoni/tour.dart

Last active Feb 8, 2020
Embed
What would you like to do?
// void main() {
// // print(printInteger(10));
// var cc=log(44.2);
// print(cc.runtimeType);
// }
// printInteger(int number)
// {
// return number;
// }
// dynamic log(dynamic obj){
// print(obj.toString());
// return obj;
// }
//Abstract class method
// void main(){
// Gist g= Gist();
// g.meCall();
// }
// abstract class Vish{
// void meCall();
// }
// class Gist extends Vish{
// void meCall(){
// print("hi");
// }
// }
// //difference between dynamic and object
// dynamic a;
// Object b;
// void main(){
// a = "";
// b = "";
// printLengths();
// }
// printLengths() {
// // no warning
// print(a.length);
// // warning:
// // The getter 'length' is not defined for the class 'Object'
// print(b.length);
// }
//Diff between var final and dynamic
// void main() {
// dynamic v = 123;
// v = 456;
// v = 'abc';
// var v1 = 123; // v is of type int.
// v1 = 456; // changing value of v from 123 to 456.
// v1 = 'abc'; // ERROR: can't change type of v from int to String.
// final v2 = 123; // v is of type int.
// v2 = 456; // ERROR: can't change value of v from 123 to 456.
// v2 = 'abc';
// }
//Without giving the type to the function we can still return the type.
// void main(){
// print(isFunction(10));
// }
// isFunction(int i){
// return i is int;
// }
//Default parameter in the function named
// void main()
// {
// doStuff();}
// void doStuff(
// {List<int> list = const [1, 2, 3],
// // Map<String, String> gifts = const {
// 'first': 'paper',
// 'second': 'cotton',
// 'third': 'leather'
// }}) {
// print('list: $list');
// print('gifts: $gifts');
// }
// bool topLevel = true;
// void main() {
// var insideMain = true;
// void myFunction() {
// var insideFunction = true;
// void nestedFunction() {
// var insideNestedFunction = true;
// assert(topLevel);
// assert(insideMain);
// assert(insideFunction);
// assert(insideNestedFunction);
// }
// }
// }
//factory pattern
// class GetWidget{
// String name;
// factory GetWidget(String n){
// if(n=="Container"){
// return GetWidget.container();
// }
// else if(n=="Align"){
// return GetWidget.align();
// }
// }
// GetWidget.container(){
// name= "Scaffold.container()";
// }
// GetWidget.align(){
// name= "Scaffold.Align()";
// }
// }
// void main(){
// GetWidget g= new GetWidget("Container");
// print(g.name);
// }
//use factory method when you want to return existing instance of class insted of //creating new one
//-Singleton
//-want to return subclass instance insted of class itself
// class Person {
// // In the interface, but visible only in this library.
// final _name;
// // Not in the interface, since this is a constructor.
// Person(this._name);
// // In the interface.
// String greet(String who) => 'Hello, $who. I am $_name.';
// }
// // An implementation of the Person interface.
// class Impostor implements Person {
// get _name => '';
// String greet(String who) => 'Hi $who. Do you know who I am?';
// }
// String greetBob(Person person) => person.greet('Bob');
// void main() {
// print(greetBob(Person('Kathy')));
// print(greetBob(Impostor()));
// }
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.