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What is interface in Typescript?

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What is Interface?
An interface is a TypeScript artifact, it is not part of ECMAScript. ... Along with functions, an interface can also be used with a Class as well to define custom types. An interface is an abstract type, it does not contain any code as a class does. It only defines the 'signature' or shape of an API.

Interfaces in TypeScript are similar to interfaces in many object-oriented programming languages. However, in TypeScript, they play the role of defining the "shape" of an object. Objects don't have to explicitly implement interfaces as you would in C# or Java. Instead, interfaces define the expected properties so that the type checker can verify an object with the expected properties is being used.

Interfaces have zero runtime JS impact. There is a lot of power in TypeScript interfaces to declare the structure of variables.

TypeScript classes can implement an interface just like a class in Java or C# might implement an interface. 
 

declare var myPoint: { x: number; y: number; };

interface Point {
    x: number; y: number;
}
declare var myPoint: Point;

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posted Jun 8 by Manish Tiwari

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What is Typescript?

TypeScript is a free and open source programming language developed and maintained by Microsoft. It is a strict superset of JavaScript, and adds optional static typing and class-based object-oriented programming to the language.

TypeScript is a superset of JavaScript which primarily provides optional static typing, classes and interfaces. One of the big benefits is to enable IDEs to provide a richer environment for spotting common errors as you type the code.

There are two main ways to get the TypeScript tools:

  1. Via npm (the Node.js package manager)
  2. By installing TypeScript’s Visual Studio plugins
The command-line TypeScript compiler can be installed as a Node.js package.
 
Install
npm install -g typescript

Video for Typescript

https://www.youtube.com/watch?v=KrLvnVoSzEA

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The user interface is a vital part of any computer system. It determines how easily an end user can interact with the program. One of the achievements of a system depends on how well a user interface is designed and whether it creates a seamless experience for end users.

Definition of UI and UI Design

The UI of an application, also know as an ‘interface’, is the means by with a user and a computer system interact. It can comprise both software and hardware components.

In particular, UI includes:

  • The textual, graphical, and auditory information that the program presents to the user.
  • The control sequences that a user employs to control the program. For example, mouse movements, keystrokes with the computer keyboard, and selections through the touchscreen.

A simple example of the UI in the real world is an Automatic Teller Machine (ATM). It consists of a keypad, a display window, a selection of choice options, and a help screen that displays instructions for completing an ATM transaction.

User Interface Design

User Interface Design is the process of designing user interface for websites, appliances, computers, and software applications. It focuses on anticipating an end user’s requirement, that is, what the users might need to do and then, ensuring that the UI has all elements to facilitate those actions.

Parts of User Interface Design

The fundamental parts or elements of most UIs are as follows:

  • Input controls
  • Navigational Components
  • Informational Components
  • Containers

Principles and Attributes of User Interface Design

UI design principles focus on improving the quality of user interface design. Some of these include:

The structure principle

The principle is concerned with overall UI architecture. The design of the interface should be visually, theoretically, and linguistically clear. It should provide clear and user-specific paths and relevant information.

           Image Courtesy: https://www.amazon.com

Tips/Techniques to support the structure principle

The techniques that help to support this principle are as follows:

  • You should group the logically connected items to communicate an separate unrelated items to achieve visual organization.
  • Ensure good cross-linkages and quick jumps to important sections of the websites.
  • Design page-specific navigation and access to information.
  • Keep the screen less cluttered and easier to understand.
  • Present the flow of actions, information, responses, and visual preparations in a sensible order that is easy to remember and place in context.
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