TypeScript - Optional Parameters Function

Optional Parameters Function -

We can specify optional properties on interfaces and the property may be present or missing in the object.

Stayed Informed – Learn Angular 2 with TypeScript

In the below example, the address property is optional on the following “User” interface.

//USER INTERFACE 
interface User {
    name: string;
    age: number;
    address?: string //Optional
}

//FUNCTION USING USER INTERFACE 
let userInfo = function(user: User) {
   let info = "Hello, " + user.name + " Your Age is - " + user.age + " and Address is -" + user.address;

   return info;
}

//USER INFO JSON OBJECT
let info = {
    name: "Anil",
    age: 30
};

//RESULT
console.log(userInfo(info));

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