Function Types

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The course is part of this learning path

Typescript: Zero to Hero
8
2
Function Types
Overview
Difficulty
Beginner
Duration
9m
Students
193
Ratings
5/5
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Description

This module introduces you to Interfaces in TypeScript.

Learning Objectives

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

  • How to use Function Types
  • How to use Optionals
  • How to use Excess Property Checks
  • How to use Indexable Types
  • How Interfaces work with Classes
  • How to create Extendable Interfaces

Intended Audience

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

Prerequisites

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).

Feedback

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

Transcript

If we look at function types with interfaces, the code shown has an interface called Log. That is defined and has a function that takes a string called error, and provides no return value. logError is a function of type Log. Meaning that it's signed the contract with the Log interface. logError is a function that takes a string called x, and has no return value. It meets the contract, so there's no errors shown. Interfaces can describe the wide range of shapes that JavaScript objects can take. Including functions and specifying the shape of a set of arguments of a function. It's one of the most common uses for interfaces in TypeScript. Note that the parameter name in the implementation need not match the name in the interface.

Lectures

About the Author
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Ed Wright
Senior Learning Consultant
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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