Angular UI Development with PrimeNG

Interfaces, classes, and enums

An interface is a way to take a particular structure/shape and give it a name so that we can reference it later as a type. It defines a contract within our code. Interfaces begin with the keyword interface. Let's take an example:

interface Person {  name: string  children?: number  isMarried(): boolean  (): void}

The specified interface Person has the following:

• The name property of type string.
• The optional property children of type number. Optional properties are denoted by a question mark and can be omitted.
• The isMarried method that returns a boolean value.
• Anonymous (unnamed) method that returns nothing.

Typescript allows you to use the syntax [index: type] to specify a string or number type based collection ...