TypeScript -Simple Types

The course is part of this learning path

Simple Types: An Introduction

This module will introduce you to Simple Types in TypeScript. You’ll learn about Arrays, Tuples, and Type Assertion, too.

Learning Objectives

The objectives of this module are to provide you with an understanding of:

  • What Simple Types are
  • How to use Arrays
  • How to use Tuples
  • How to use Type Assertion

Intended Audience

This learning path is aimed at all who wish to learn how to use TypeScript.


It is essential you understand the face of contemporary web development to attend this course. You should have a good working knowledge of Javascript. Please note: Before attending this class delegates must have a Microsoft account (signing up one is free).


We welcome all feedback and suggestions - please contact us at to let us know what you think.


In this module, we're gonna explore simple types. By the end of it you should be aware of the types that are available in TypeScript and how we can assign them variables, that includes working with some new types that TypeScript introduces. As TypeScript is a superset of JavaScript, all of the primitive and reference types that JavaScript has available are there to use in TypeScript. As a reminder, as of ES2015 this groups of seven are boolean, number, string, object, null, undefined and symbol. To add a type declaration in TypeScript you simply declare your variable as you would in JavaScript either with const or let, then have a colon followed by the name of the type. After that, you can define the initial value or not for let.


Arrays - Tuples - Any and Unknown - Null and Unidentified - Function Arguments and Return Types - Enums - Type Assertion 

About the Author
Learning Paths

Ed is an Outstanding Trainer in Software Development, with a passion for technology and its uses and holding more than 10 years’ experience.

Previous roles have included being a Delivery Manager, Trainer, ICT teacher, and Head of Department. Ed continues to develop existing and new courses, primarily in web design using: PHP, JavaScript, HTML, CSS, SQL, and OOP (Java), Programming Foundations (Python), and DevOps (Git, CI/CD, etc). Ed describes himself as practically minded, a quick learner, and a problem solver who pays great attention to detail. 

Ed’s specialist area is training in Emerging Technologies, within Web Development. Ed mainly delivers courses in JavaScript covering vanilla JS, ES2015+, TypeScript, Angular, and React (the latter is authored by Ed) and has delivered on behalf of Google for PWAs. Ed has also developed a new suite of PHP courses and has extensive experience with HTML/CSS and MySQL. 

Ed is responsible for delivering QA’s Programming Foundations course using the Eclipse IDE. His skillset extends into the DevOps sphere, where he is able to deliver courses based around Agile/Scrum practices, version control, and CI/CD.

Covered Topics