TypeScript Class Example

abstract class Department {
  constructor(public name: string) {}

  printName(): void {
    console.log("Department name: " + this.name);
  }

  abstract printMeeting(): void; // must be implemented in derived classes
}

class AccountingDepartment extends Department {
  constructor() {
    super("Accounting and Auditing"); // constructors in derived classes must call super()
  }

  printMeeting(): void {
    console.log("The Accounting Department meets each Monday at 10am.");
  }

  generateReports(): void {
    console.log("Generating accounting reports...");
  }
}

let department: Department; // ok to create a reference to an abstract type
department = new Department(); // error: cannot create an instance of an abstract class
Cannot create an instance of an abstract class.2511Cannot create an instance of an abstract class.department = new AccountingDepartment(); // ok to create and assign a non-abstract subclass
department.printName();
department.printMeeting();
department.generateReports();
Property 'generateReports' does not exist on type 'Department'.2339Property 'generateReports' does not exist on type 'Department'.Try

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4.1

Simon LANG 95 points

                                    class Info {
  private name: string ;
  constructor(n:string){
    this.name = n ;
  };
  describe(){
    console.log(`Your name is  ${this.name}`);
  }
}

const a = new Info('joyous');
a.describe();

Thank you! 10

4.1 (10 Votes)

Nelsonic 85 points

                                    class Animal {  public name: string;
  public constructor(theName: string) {    this.name = theName;  }
  public move(distanceInMeters: number) {    console.log(`${this.name} moved ${distanceInMeters}m.`);  }}Try

Thank you! 0

3.71

Peterjohan1212 100 points

                                    class GenericNumber&lt;T&gt; {
    zeroValue: T;
    add: (x: T, y: T) =&gt; T;
}

let myGenericNumber = new GenericNumber&lt;number&gt;();
myGenericNumber.zeroValue = 0;
myGenericNumber.add = function(x, y) { return x + y; };

Thank you! 11

3.71 (14 Votes)

3.88

Richie Bendall 100 points

                                      var obj:any = {}
  obj.prop = 5;

Thank you! 8

3.88 (8 Votes)

Zikato 95 points

                                    class Animal {
  move(distanceInMeters: number = 0) {
    console.log(`Animal moved ${distanceInMeters}m.`);
  }
}

class Dog extends Animal {
  bark() {
    console.log(&quot;Woof! Woof!&quot;);
  }
}

const dog = new Dog();
dog.bark();
dog.move(10);
dog.bark();Try

Thank you! 2

4 (2 Votes)

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