Nicolas Rollin: Created page with "== First Step == === Call Ruby command line ===

irb

=== Methode === * Define a methode "m"

def m(name = "World") puts "Hello Mr #{name.capitalize}!" end

..."

2014-11-13T18:02:05Z

Created page with "== First Step == === Call Ruby command line === <pre>irb</pre> === Methode === * Define a methode "m" <pre>def m(name = "World") puts "Hello Mr #{name.capitalize}!" end</pre>..."

New page

== First Step ==
=== Call Ruby command line ===
<pre>irb</pre>

=== Methode ===
* Define a methode "m"
<pre>def m(name = "World")
puts "Hello Mr #{name.capitalize}!"
end</pre>

* Execute
<pre>m("nicolas")</pre>

<pre>Hello Mr Nicolas!
=> nil</pre>

=== Class ===
<pre>
class Greeter
def initialize(name = "World")
@name = name
end
def say_hi
puts "Hi #{@name}!"
end
def say_bye
puts "Bye #{@name}, come back soon."
end
end</pre>
* class define a new class
* @name is a variable d'instance
===Object===
<pre>irb>o = Greeter.new("Nicolas")
=> #<Greeter:0x00000002579a48 @name="Nicolas"></pre>
<pre>irb>o.say_hi
Hi Nicolas!
=> nil</pre>
<pre>irb> o.say_bye
Bye Nicolas, come back soon.
=> nil</pre>
====Methodes of a particular Object====
* Current Object and parent
<pre>irb>Greeter.instance_methods
=> [:say_hi, :say_bye, :m, :nil?, :===, :=~, :!~, :eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup, :initialize_dup, :initialize_clone, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :freeze, :frozen?, :to_s, :inspect, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :respond_to_missing?, :extend, :display, :method, :public_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :==, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__, :__id__]</pre>
* Current Object only
<pre>irb>Greeter.instance_methods(false)
=> [:say_hi, :say_bye]</pre>

====Validate Object Methode ====
<pre>irb>o.respond_to?("name")
=> false</pre>
<pre>o.respond_to?("say_hi")
=> true</pre>
<pre>o.respond_to?("to_s")
=> true</pre>

====Change Class Attribut====
<pre>irb>class Greeter
attr_accessor :name
end</pre>

o = Greeter.new("MySelf") 

o.respond_to?("name") 

o.respond_to?("name=") 

o.say_hi 

o.name="Betty" 

o 

o.name 

o.say_hi 

* attr_accessor add tow methods "name" and ""name=""

====Create a batch file====
<pre>
#!/usr/bin/env ruby

class MegaGreeter
attr_accessor :names

# Création d'un objet
def initialize(names = "World")
@names = names
end

# Saluer tout le monde
def say_hi
if @names.nil?
puts "..."
elsif @names.respond_to?("each")
# @names est une liste de noms : traitons-les uns par uns
@names.each do |name|
puts "Hello #{name}!"
end
else
puts "Coucou #{@names}!"
end
end

# Dire au revoir à tout le monde
def say_bye
if @names.nil?
puts "..."
elsif @names.respond_to?("join")
# Grouper les différents noms de la liste par des virgules
puts "Goodbye #{@names.join(", ")}. Come back soon!"
else
puts "Ciao #{@names}. Come back soon!"
end
end

end

if __FILE__ == $0
mg = MegaGreeter.new
mg.say_hi
mg.say_bye

# Modifier le nom en Zeke
mg.names = "Zeke"
mg.say_hi
mg.say_bye

# Changer le nom pour un tableau (une liste de noms)
mg.names = ["Albert", "Brenda", "Charles",
"Dave", "Engelbert"]
mg.say_hi
mg.say_bye

# Maintenant, le nom n'est plus...
mg.names = nil
mg.say_hi
mg.say_bye
end

</pre>

* Execute
<pre>ruby helloworl.rb</pre>

<pre>Coucou World!
Ciao World. Come back soon!
Coucou Zeke!
Ciao Zeke. Come back soon!
Hello Albert!
Hello Brenda!
Hello Charles!
Hello Dave!
Hello Engelbert!
Goodbye Albert, Brenda, Charles, Dave, Engelbert. Come back soon!
</pre>

===Structure===

====Comment====

<pre># This is a comment</pre>
====If====

<pre># If null
if @names.nil?
puts "..."
elsif @names.respond_to?("join")
# Grouper les noms par des virgules
puts "Goodbye #{@names.join(", ")}. Come back soon!"
else
puts "Goodbye #{@names}. Come back soon!"
end
</pre>

====Iteration====
<pre>@names.each do |name|
puts "Hello #{name}!"
end
</pre>

====Control====
* __FILE__ contains the current file name.
* $0 The name of the used to run the current file
<pre>if __FILE__ == $0</pre>

Ruby First Step - Revision history

Nicolas Rollin: Created page with "== First Step == === Call Ruby command line ===
irb
=== Methode === * Define a methode "m"
def m(name = "World") puts "Hello Mr #{name.capitalize}!" end
..."

Ruby First Step - Revision history

Nicolas Rollin: Created page with "== First Step == === Call Ruby command line === irb === Methode === * Define a methode "m" def m(name = "World") puts "Hello Mr #{name.capitalize}!" end..."

Nicolas Rollin: Created page with "== First Step == === Call Ruby command line ===
irb
=== Methode === * Define a methode "m"
def m(name = "World") puts "Hello Mr #{name.capitalize}!" end
..."