Ruby - Exceptions.

Ruby module R111

Exceptions.

Exercises, examples and other material relating to training module R111. This topic is presented on public courses Learning to program in Ruby, Ruby Programming

Ruby Programming - training course - A Modern, Object Oriented, Portable Scripting language.

Ruby Programming - A Modern, Object Oriented, Portable Scripting language. This quickly moving course covers the fundamentals of the Ruby language for ...

http://www.wellho.net/course/rpfull.html [course]

Learning to Program in Ruby - training course - A Modern, Object Oriented, Portable Scripting language.

Learning to Program in Ruby - A Modern, Object Oriented, Portable Scripting language. Ruby is very much an object oriented language, and we concentrate ...

http://www.wellho.net/course/rlfull.html [course]

errors v exceptions

It s said that between a half and 95% of a program will be given over to error checking. Indeed some of the web based programs on this site are little ...

http://www.wellho.net/solutions/general- ... tions.html [longer article]

What are exceptions - Python based answer

How do you check for run time errors in your program? You'll include tests with if statements in almost every program you write, to ensure that user ...

http://www.wellho.net/mouth/1875_Wha ... nswer.html [short article]

Ruby collections and strings - some new examples

From yesterday's Ruby course - a whole set of new examples on Ruby collections - arrays (which are ordered lists) and hashes (which are unordered). In ...

http://www.wellho.net/mouth/2621_Rub ... mples.html [short article]

Direct access to object variable (attributes) in Ruby

Rather than writing getters and setters, in many Object Oriented languages you can access the variables within an object directly. That can be dangerous ...

http://www.wellho.net/mouth/2620_Dir ... -Ruby.html [short article]

Handling unusual and error conditions - exceptions

"I can't answer that question in the way you expect" ... that's something that may be said to you occasionally - you ask someone what suit a playing card ...

http://www.wellho.net/mouth/2622_Han ... tions.html [short article]

You can check for some, but not all, errors. It's sometimes necessary (and often preferable even if not necessary) to write clean code that assumes correct operation, and provide rescue blocks telling Ruby what to do in the event of a failure.

This topic is presented on public courses Learning to program in Ruby, Ruby Programming

Examples from our training material

bmi.rb	BMI (Body Mass Index) calculator
catcher	Converting String to Integer and handling errors
fsta.rb	File Reporter - assumes all is OK
fstb.rb	File Reporter - handle problems with open
fstc.rb	File Reporter - handle multiple problems and re prompt
mc	Catching user errors - a short demonstration
mighty.rb	Passing exceptions back to calling code

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

begin and end (and a mention of BEGIN and END).
Raise and rescue.
Throw and catch.

Complete learning

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