TypeScript Interfaces

Interfaces define properties, methods and events, which are the members of the interface.
Interfaces restricted to only the declaration of all the members.
The deriving class will have the defining and implementation of the members.

Syntax

interface interface_name { 
}

1 2	interface interface_name { }

Example code:

// Interface declaration
interface Employee {
    firstName: string,
    lastName: string,
    greet: () => string
}
// object of type Employee
var employeeObj: Employee = {
    firstName: "shri",
    lastName: "kumar",
    greet: (): string => { return "Hi there !" }
}
console.log("Customer Object ")
console.log(employeeObj.firstName) // output: shri
console.log(employeeObj.lastName) // output: kumar
console.log(employeeObj.greet()) // output: Hi there !

// Interface declaration

interface Employee {

firstName: string,

lastName: string,

greet: () => string

}

// object of type Employee

var employeeObj: Employee = {

firstName: "shri",

lastName: "kumar",

greet: (): string => { return "Hi there !" }

}

console.log("Customer Object ")

console.log(employeeObj.firstName) // output: shri

console.log(employeeObj.lastName) // output: kumar

console.log(employeeObj.greet()) // output: Hi there !

above example, employee is the interface, and employeeObj object is type of Employee.

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