Learn Ruby Programming - Revision history

Ittichai at 17:22, 23 February 2012

2012-02-23T17:22:13Z

Ittichai at 17:17, 23 February 2012

2012-02-23T17:17:39Z

Ittichai at 15:54, 23 February 2012

2012-02-23T15:54:19Z

Ittichai at 15:53, 23 February 2012

2012-02-23T15:53:41Z

Ittichai at 17:16, 11 February 2012

2012-02-11T17:16:48Z

Ittichai at 17:09, 11 February 2012

2012-02-11T17:09:58Z

Ittichai at 17:03, 11 February 2012

2012-02-11T17:03:06Z

Ittichai: Created page with "* Need IRB (Interactive Ruby) http://rubyinstaller.org/ http://rubyonrails.org/download * Simple

 irb(main):022:0> 2 + 4 => 6  irb(main):023:0> print "Hello World" Hello Wo..."

2012-02-11T17:01:56Z

Created page with "* Need IRB (Interactive Ruby) http://rubyinstaller.org/ http://rubyonrails.org/download * Simple <pre> irb(main):022:0> 2 + 4 => 6 irb(main):023:0> print "Hello World" Hello Wo..."

New page

* Need IRB (Interactive Ruby)
http://rubyinstaller.org/
http://rubyonrails.org/download

* Simple
<pre>
irb(main):022:0> 2 + 4
=> 6

irb(main):023:0> print "Hello World"
Hello World=> nil

irb(main):024:0> 3.times do print "Yeah" end
YeahYeahYeah=> 3

irb(main):027:0> 7/3
=> 2
irb(main):028:0> 7.0/3
=> 2.3333333333333335
</pre>

* Variable
<pre>
irb(main):025:0> x = 12
=> 12
irb(main):026:0> x + 13
=> 25

</pre>

* Object Oriented - Class
<pre>
irb(main):029:0> class Vehicle
irb(main):030:1> attr_accessor :name, :type, :make, :model
irb(main):031:1> end
=> nil
</pre>

* Object Oriented - Instantiation - Creating an Object
<pre>
irb(main):039:0> my_vehicle = Vehicle.new
=> #<Vehicle:0x29583c0>
irb(main):040:0> my_vehicle.name = "Work Car"
=> "Work Car"
irb(main):041:0> my_vehicle.make = "Honda"
=> "Honda"
irb(main):045:0> puts my_vehicle.name + " is " + my_vehicle.make
Work Car is Honda
=> nil

* Object Oriented - Inheritance
<pre>
irb(main):051:0* class Bus < Vehicle
irb(main):052:1> attr_accessor :num_seats
irb(main):053:1> end
=> nil
irb(main):054:0> my_bus = Bus.new
=> #<Bus:0x282fd50>
irb(main):055:0> my_bus.make = "GMC"
=> "GMC"
irb(main):056:0> my_bus.num_seats = 30
=> 30
</pre>

@@ Line 156: / Line 156: @@
 * Boolean operators
 <pre>
-&&
+&&  AND
 </pre>

@@ Line 179: / Line 179: @@
 * Data type conversion
 <pre>
-c = 13
+> c = 13
-print c.to_f/4
+> print c.to_f/4  # to_f to convert to floating
 .25=>nil
 </pre>
@@ Line 186: / Line 186: @@
 * Constant
 <pre>
-> Pi = 3.14
+> Pi = 3.14    # Initcap the variable
 > print Pi
 .14=> nil
@@ Line 193: / Line 193: @@
 warning: already initialized constant Pi
-print Pi
+> print Pi
 => nil   # Just a warning, the value is actually changed.
 </pre>
 [[Category:Learn_Ruby]]

@@ Line 186: / Line 186: @@
 * Constant
 <pre>
-Pi = 3.14
+> Pi = 3.14
-print Pi
+> print Pi
 .14=> nil
-Pi = 3
+> Pi = 3
 warning: already initialized constant Pi

@@ Line 28: / Line 28: @@
 irb(main):026:0> x + 13
 => 25
 </pre>
@@ Line 94: / Line 104: @@
 irb(main):069:0> 36.class
 => Fixnum
 </pre>
@@ Line 108: / Line 121: @@
 </pre>
 [[Category:Learn_Ruby]]

@@ Line 16: / Line 16: @@
 irb(main):027:0> 7/3
 => 2
 irb(main):028:0> 7.0/3
 => 2.3333333333333335
@@ Line 24: / Line 25: @@
 irb(main):025:0> x = 12
 => 12
 irb(main):026:0> x + 13
 => 25
@@ Line 41: / Line 43: @@
 irb(main):039:0> my_vehicle = Vehicle.new
 => #<Vehicle:0x29583c0>
 irb(main):040:0> my_vehicle.name = "Work Car"
 => "Work Car"
 irb(main):041:0> my_vehicle.make = "Honda"
 => "Honda"
 irb(main):045:0> puts my_vehicle.name + " is " + my_vehicle.make
 Work Car is Honda
@@ Line 56: / Line 61: @@
 irb(main):053:1> end
 => nil
 irb(main):054:0> my_bus = Bus.new
 => #<Bus:0x282fd50>
 irb(main):055:0> my_bus.make = "GMC"
 => "GMC"
 irb(main):056:0> my_bus.num_seats = 30
 => 30
 </pre>
@@ Line 77: / Line 100: @@
 irb(main):074:0> puts "Hello"
 Hello
 irb(main):075:0> Kernel.puts "Hello"
 Hello
 => nil
 </pre>

@@ Line 48: / Line 48: @@
 Work Car is Honda
 => nil
 * Object Oriented - Inheritance
@@ Line 61: / Line 62: @@
 irb(main):056:0> my_bus.num_seats = 30
 => 30
 </pre>

@@ Line 1: / Line 1: @@
 * Need IRB (Interactive Ruby)
-http://rubyinstaller.org/
+** http://rubyinstaller.org/
-http://rubyonrails.org/download
+** http://rubyonrails.org/download
-* Simple
+* Simple commands
 <pre>
 irb(main):022:0> 2 + 4