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added ruby examples
1 parent 5f1c979 commit 26438b5

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‎v3/index.html‎

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<head>
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<title>Online Python Tutor - Visualize Python, Java, JavaScript, TypeScript, and Ruby code</title>
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<title>Online Python Tutor - Visualize Python, Java, JavaScript, TypeScript, and Ruby code execution</title>
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<meta http-equiv="Content-type" content="text/html; charset=UTF-8"/>
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‎v3/js/opt-frontend.js‎

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@@ -559,6 +559,21 @@ var PY3_EXAMPLES = {
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nonlocalLink: "example-code/nonlocal.txt",
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}
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var RUBY_EXAMPLES = {
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rubyBlocksLink: 'ruby-example-code/blocks-basic.rb',
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rubyBlocksScopingLink: 'ruby-example-code/blocks-scoping-2.rb',
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rubyInheritanceLink: 'ruby-example-code/class-inheritance.rb',
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rubyConstantsLink: 'ruby-example-code/constants-4.rb',
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rubyContainersLink: 'ruby-example-code/container-data-types.rb',
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rubyGlobalsLink: 'ruby-example-code/globals.rb',
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rubyLambdaScopingLink: 'ruby-example-code/lambda-scoping-2.rb',
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rubyMegagreeterLink: 'ruby-example-code/megagreeter.rb',
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rubyProcLink: 'ruby-example-code/proc-basic.rb',
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rubyProcScopingLink: 'ruby-example-code/proc-scoping.rb',
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rubySymbolsLink: 'ruby-example-code/symbols.rb',
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rubyToplevelLink: 'ruby-example-code/toplevel-inst-class-vars.rb',
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};
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var chatBox = undefined;
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function createChatBox() {
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assert(!chatBox);
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} else if (JAVA_EXAMPLES[myId] !== undefined) {
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exFile = JAVA_EXAMPLES[myId];
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lang = 'java';
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} else if (RUBY_EXAMPLES[myId] !== undefined) {
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exFile = RUBY_EXAMPLES[myId];
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lang = 'ruby';
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} else if (PY2_EXAMPLES[myId] !== undefined) {
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exFile = PY2_EXAMPLES[myId];
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‎v3/ruby-example-code/blocks-basic.rb‎

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# Adapted from Learning Ruby by Michael Fitzgerald, O'Reilly
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def gimme
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if block_given?
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yield
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else
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print "Oops, no block."
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end
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puts " You're welcome."
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end
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gimme { print "Thank you." }
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gimme do
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localX = "Thank you again."
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print localX
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end
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gimme # no block

‎v3/ruby-example-code/blocks-scoping-2.rb‎

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# how does lexical scoping work for blocks?
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x = 5
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def gimme
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y = 10
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yield
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puts "You're welcome."
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end
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gimme do
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puts x
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x += 100 # can modify x in enclosing scope
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puts x
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puts y # can't find y since this is lexically scoped
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end

‎v3/ruby-example-code/class-inheritance.rb‎

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# adapted from http://rubylearning.com/satishtalim/ruby_inheritance.html
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class Mammal
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def breathe
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puts "inhale and exhale"
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end
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end
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class Cat < Mammal
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def speak
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puts "Meow"
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end
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end
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class Tabby < Cat
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def speak
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puts "Tabby meow"
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end
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end
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rani = Cat.new
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rani.breathe
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rani.speak
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tab = Tabby.new
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tab.speak

‎v3/ruby-example-code/constants-4.rb‎

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# adapted from http://rubylearning.com/satishtalim/ruby_constants.html
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OUTER_CONST = 99
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class Const
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def get_const
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CONST
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end
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CONST = OUTER_CONST + 1
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end
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puts Const.new.get_const
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puts Const::CONST
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puts ::OUTER_CONST
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puts Const::NEW_CONST = 123

‎v3/ruby-example-code/container-data-types.rb‎

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require 'set'
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my_array = [1, 2, 3, 'hello', false, true, nil]
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my_hash = {'John' => 26, 'Jane' => 21, 'Jack' => 30}
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my_set = my_array.to_set
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my_hash['nested array'] = my_array
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my_array[1] = ['a', 'b', 'c']

‎v3/ruby-example-code/globals.rb‎

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$globalX = 'I am a global!'
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$globalY = 'I am another global!'
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localX = 'I am a local in <main>'
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def foo
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reallyLocalX = 'I am a local in foo'
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puts reallyLocalX
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$globalX << $globalY
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end
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$globalX << '---'
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foo

‎v3/ruby-example-code/lambda-scoping-2.rb‎

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# how does lexical scoping work for lambdas?
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x = 5
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p = lambda {
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puts x
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x += 100 # can modify x in enclosing scope
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puts x
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puts 'end of p'
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}
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def gimme
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x = 10
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print 'In gimme, x is '
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puts x
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yield
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puts "You're welcome."
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print 'In gimme, x is '
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puts x
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end
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gimme &p # use '&' to turn a lambda into a block
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print 'In main, x is '
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puts x

‎v3/ruby-example-code/megagreeter.rb‎

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# Adapted from Ruby in Twenty Minutes
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# https://www.ruby-lang.org/en/documentation/quickstart/3/
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class MegaGreeter
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attr_accessor :names
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# Create the object
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def initialize(names = "World")
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@names = names
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end
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# Say hi to everybody
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def say_hi
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if @names.nil?
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puts "..."
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elsif @names.respond_to?("each")
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# @names is a list of some kind, iterate!
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@names.each do |name|
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puts "Hello #{name}!"
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end
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else
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puts "Hello #{@names}!"
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end
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end
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end
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mg = MegaGreeter.new
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mg.say_hi
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# Change name to be "Zeke"
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mg.names = "Zeke"
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mg.say_hi
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# Change the name to an array of names
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mg.names = ["Albert", "Brenda", "Charles",
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"Dave", "Engelbert"]
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mg.say_hi
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# Change to nil
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mg.names = nil
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mg.say_hi

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