What is Optional Properties in TypeScript?

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

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

Example as,

//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));

Stayed Informed – Learn Angular 2 with TypeScript

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