Simple Types

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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 paths5

An outstanding trainer in software development with more than 15 years experience as a Corporate and Apprentice Trainer, ICT Teacher and Head of Department, with a passion for technology and its uses. Continuing to develop existing and new skills and courses, primarily in web design using PHP, JavaScript, HTML, CSS and SQL but also OOP (Java), programming foundations (Using Python), DevOps (Git, CI/CD, etc) and Agile/Scrum. Practically minded, a quick learner and a problem solver with an attention to detail to ensure high quality outcomes.