Anil Singh | Code-sample.com

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 I hope you are enjoying with this post! Please share with you friends. Thank you!!