In this first chapter, you'll learn what defensive programming is,  and how to use existing packages for increased efficiency. You will then learn to manage the packages loaded in your environment and the potential conflicts that may arise.

Defensive R Programming

Real Programmers...

Don't reinvent the wheel/package

Updating Packages

Out of Date Packages

Task Views

Packages and Namespaces

Number of Loaded Packages

Counting Exported Functions

The Conflicted Package

Avoiding Conflict

Programming is simpler when you get feedback on your code execution. In R, we use messages, warnings and errors to signal to keep the user informed. This chapter will discuss when and where you should use these communication tools.

Early warning systems

To TRUE or not to T

Let's be evil

If it weren't for those pesky kids

Message in a bottle

Did you get the message?

Suppressing startup messages

Stop being noisy!!!

Using message in practice

You have been warned

Messages vs Warnings

Suppressing warnings

Stop (right now)

Warnings vs Stop

Using the stop() function

We can avoid making mistakes using a consistent programming approach. In this chapter, we will introduce you to R best practices.

Preparing your defences

What does DRY mean?

Refactoring: functions

Just one comment

Header comments

A little bit dotty

Use a full stop in variable names

Avoiding the .

Coding Style

Importance of consistent style

Static Code Analysis for R

Code tidying

More linting

Preparing your defenses

Creating a script is nice, but working on a project with several scripts and assets requires structure. This final chapter will teach you good organization practices, so you can go from script to package with an optimal workflow.

Een strijdplan

Het belang van consistentie

Geef me wat ruimte

Menselijk leesbare bestandsnamen

Welk datumformaat moeten we gebruiken?

Een project organiseren

Absolute paden vermijden

De map input/

Absoluut vs relatief

Grafieken en output

Grafieken genereren

Graphics/

Eén laatste workflow

Creating a Battle Plan

R-scripts schrijven is makkelijk. Goede R-code schrijven is lastig. In deze cursus bespreken we defensief programmeren: een set standaardtechnieken die helpt om bugs te verminderen en samenwerken in teams te vergemakkelijken. We bekijken technieken om veelvoorkomende fouten te voorkomen en hoe je onvermijdelijke fouten in je code afhandelt. We sluiten af met wanneer je de stap maakt van script naar project naar package.

Intermediate R

Leer robuuste code maken met defensieve programmeertechnieken in R om fouten te vermijden.

Grafieken en output

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