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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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link.. My Tech Blog - https://www.code-sample.com/ My Books - Book 1 and Book 2