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typescript interface inheritance tutorial


TypeScript interface:

An interface is declared with interface keyword. It is a way of implementing 100% abstraction. It only contains the declaration of the members. Interface forms a contract with your class that force your class to have all methods defined by the interface must appear in the class.

TypeScript provides the facility of inheritance between interfaces i.e. an interface can inherit other interface. We have to use extends keyword to implement inheritance among interfaces.

Syntax:

ChildInterfaceName extends SuperInterfaceName

Example:

interface Person { 
   age:number;
   name:string;
} 
 
interface Employee extends Person { 
   empId:string; 
} 
 
var engineer = <Employee>{}; 
engineer.age = 30; 
engineer.name = "Jai";
engineer.empId = "EMP024";
console.log("Name:  "+engineer.name);
console.log("Age:  "+engineer.age);
console.log("Emp Id:  "+engineer.empId);

Try it:

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TypeScript Tutorial

TypeScript Overview.
Typescript vs Javascript.
Typescript let vs var.
TypeScript Hello World.
Typescript Data Types.
Typescript Variable Declaration.
TypeScript operators list.
TypeScript Arithmetic Operators.
TypeScript Comparison Operators.
TypeScript Bitwise Operators.
Typescript Logical Operators.
TypeScript Assignment Operators.
Typescript Conditional Operator.
Typescript String Operator.
Typescript typeof Operator.
TypeScript control statements.
TypeScript Switch Statement.
TypeScript for loop.
TypeScript for in loop.
TypeScript while loop.
TypeScript do while loop.
Typescript for loop break.
TypeScript for loop continue.
Typescript function.
Typescript returning function.
Typescript parameterized function.
Typescript function optional parameter.
Typescript rest parameters.
Typescript default parameters.
Typescript anonymous function.
Typescript function constructor.
Typescript Arrow/Lambda function.
Typescript function overloading.
TypeScript number object.
TypeScript string object.
TypeScript boolean object.
TypeScript date object.
TypeScript math object.
TypeScript array object.
TypeScript tuples.
TypeScript union type.
TypeScript interface.
TypeScript interface inheritance.
TypeScript interface multiple inheritance.
TypeScript class.
Typescript class inheritance.
Typescript class interface.
TypeScript abstract class.
TypeScript object.
TypeScript duck typing.
TypeScript NameSpace.
TypeScript Multi-file namespaces.
TypeScript module.
TypeScript ambient module.


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