Intro to Ruby (and RSpec)

Apr 3, 2011Download as key, pdf

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Ruby was created by Yukihiro "Matz" Matsumoto with a focus on programmer productivity and usability. It is a dynamically typed, interpreted programming language that was first released in 1996. Ruby supports object-oriented programming and features like blocks, lambdas, and regular expressions. Popular implementations of the Ruby virtual machine include MRI, YARV, JRuby, Rubinius, IronRuby, and MacRuby. RSpec is a testing framework for Ruby that uses describe and it blocks to specify expectations for code examples to verify.

THE RUBY LANGUAGE

• Originally by Yukihiro "Matz" Matsumoto
• “Ruby is designed for programmer productivity and fun, following
the principles of good user interface design. He stresses that
systems design needs to emphasize human, rather than computer,
needs.”
http://en.wikipedia.org/wiki/Ruby_(programming_language)#History

• Ruby 1.0 was released in 1996.

RUBY LANGUAGE OVERVIEW

• Dynamically typed
• Interpreted
• Can be modiﬁed at runtime
• Object oriented
• Blocks & lambdas
• Nice support for Regular Expressions

RUBY VERSIONS
ruby -v
•1.8.6 – Still around but mostly supplanted by 1.8.7
•1.8.7 – some 1.9 features, compatible w/ 1.8.6
•1.9.2 – latest version, many VMs, Rails 2.3+

RUBY VMS

• MRI (Matz's Ruby Interpreter) the original Ruby, default for 1.8
• YARV (yet another Ruby VM) faster than MRI, default for 1.9
• JRuby (Java)
• Rubinius (pure ruby)
• IronRuby (.NET)
• MacRuby, HotCocoa
• HotRuby/RubyJS (Flash/Javascript)

LETS GET STARTED

• IRB: InteractiveRuBy
>> 4
>> 4 + 4

EVERYTHING IS AN OBJECT

“test”.upcase
“test”.class
“test”.methods

EVERYTHING EVALUATES TO
SOMETHING

2+2
(2+2).zero?

METHODS ARE MESSAGES

thing.do(4)
thing.do 4
thing.send “do”, 4

OPERATORS ARE METHODS

thing.do 4 3+2
thing.do(4) 3.+(2)
thing.send “do”, 4 3.send "+", 2

DEFINING CLASSES

• Let’s write some code!

INTRODUCTION TO RSPEC

• Describe the feature
• Verify expectation

RSPEC SYNTAX

describe Something do

end

RSPEC SYNTAX

describe Something do

it "should do whatever it should do"

end

RSPEC SYNTAX

describe Something do

it "should do whatever it should do" do

end

end

RSPEC SYNTAX

describe Something do

it "should do whatever it should do" do

s = Something.new

end

end

RSPEC SYNTAX

describe Something do

it "should do whatever it should do" do

s = Something.new

s.do_whatever(3, 2, 1)

end

end

RSPEC SYNTAX

describe Something do

it "should do whatever it should do" do

s = Something.new

s.do_whatever(3, 2, 1).should == "blast off!"

end

end

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Intro to Ruby (and RSpec)

1. THE RUBY LANGUAGE

2. THE RUBY LANGUAGE • Originally by Yukihiro "Matz" Matsumoto • “Ruby is designed for programmer productivity and fun, following the principles of good user interface design. He stresses that systems design needs to emphasize human, rather than computer, needs.” http://en.wikipedia.org/wiki/Ruby_(programming_language)#History • Ruby 1.0 was released in 1996.

3. RUBY LANGUAGE OVERVIEW • Dynamically typed • Interpreted • Can be modiﬁed at runtime • Object oriented • Blocks & lambdas • Nice support for Regular Expressions

4. RUBY VERSIONS ruby -v •1.8.6 – Still around but mostly supplanted by 1.8.7 •1.8.7 – some 1.9 features, compatible w/ 1.8.6 •1.9.2 – latest version, many VMs, Rails 2.3+

5. RUBY VMS • MRI (Matz's Ruby Interpreter) the original Ruby, default for 1.8 • YARV (yet another Ruby VM) faster than MRI, default for 1.9 • JRuby (Java) • Rubinius (pure ruby) • IronRuby (.NET) • MacRuby, HotCocoa • HotRuby/RubyJS (Flash/Javascript)

6. LETS GET STARTED • IRB: InteractiveRuBy >> 4 >> 4 + 4

7. EVERYTHING IS AN OBJECT “test”.upcase “test”.class “test”.methods

8. EVERYTHING EVALUATES TO SOMETHING 2+2 (2+2).zero?

9. METHODS ARE MESSAGES thing.do(4) thing.do 4 thing.send “do”, 4

10. OPERATORS ARE METHODS thing.do 4 3+2 thing.do(4) 3.+(2) thing.send “do”, 4 3.send "+", 2

11. DEFINING CLASSES • Let’s write some code!

12. INTRODUCTION TO RSPEC • Describe the feature • Verify expectation

13. RSPEC SYNTAX describe Something do end

14. RSPEC SYNTAX describe Something do it "should do whatever it should do" end

15. RSPEC SYNTAX describe Something do it "should do whatever it should do" do end end

16. RSPEC SYNTAX describe Something do it "should do whatever it should do" do s = Something.new end end

17. RSPEC SYNTAX describe Something do it "should do whatever it should do" do s = Something.new s.do_whatever(3, 2, 1) end end

18. RSPEC SYNTAX describe Something do it "should do whatever it should do" do s = Something.new s.do_whatever(3, 2, 1).should == "blast off!" end end

19. RSPEC SYNTAX describe Something do it "should do whatever it should do" do s = Something.new s.do_whatever(3, 2, 1).should == "blast off!" end end

20. • Let's try it!

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Intro to Ruby (and RSpec)

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