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swan lin's List: Ruby Stduy

Lesson Cover :rubylearning.com :: View topic - Important: Read This First

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learn ruby on 2007-10-22
- Objective:
  
  To get you up-to-speed in Core Ruby programming. Learning and asking questions as a group 'jump-starts' the Ruby learning process.
Variables and Assignments: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23
- Keywords can't be used as variable names. def is a keyword
Fun with Strings: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23 and saved by 2 people
- does not have anything in it at all; we call that an empty string.
- puts 'It\'s my Ruby'
- 2 more annotations...
- - n Ruby, strings are mutable. They can expand as needed, without using much time and memory. Ruby stores a string as a sequence of bytes.
  - The command output string is sent to the operating system as a command to be executed
Numbers in Ruby: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23
- Ruby integers are objects of class Fixnum or Bignum. The Fixnum and Bignum classes represent integers of differing sizes. Both classes descend from Integer (and therefore Numeric). The floating-point numbers are objects of class Float, corresponding to the native architecture's double data type.
Ruby Features: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23 and saved by 2 people
- Free format
- Case sensitive
- 3 more annotations...
- - Comments - Anything following an unquoted #, to the end of the line on which it appears, is ignored by the interpreter. Also, to facilitate large comment blocks, the ruby interpreter also ignores anything between a line starting with =begin and another line starting with =end
  - Statement delimiters
  - But in Ruby, all of these are true; in fact, everything is true except the reserved words false and nil.
First Ruby Program: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23 and saved by 2 people
- Press the F8 key to open an output window
- Ctrl+Shift+I - this opens the Indentation Settings window
- 14 more annotations...
- - All Ruby source files have the .rb file extension
  - Foo class has name foo.rb
  - puts (s in puts stands for string; puts really means put string)
  - g)
    > simply writes onto the screen whatever comes after it,
  - simply writes onto the screen whatever comes after it
  - a. Parentheses are usually optional with a method call. These calls are all valid:
    foobar
    foobar()
    foobar(a, b, c)
    foobar a, b, c
  - everything from an integer to a string is considered to be an object
  - To use a method, you need to put a dot after the object, and then append the method name.
  - Some methods such as puts and gets are available everywhere and don't need to be associated with a specific object.
  - provided by Ruby's Kernel module
  - When you run a Ruby application, an object called main of class Object is automatically created. This object provides access to the Kernel methods.
  - I am using single quotes around Hello. ' is more efficient than "
  - String literals are sequences of characters between single or double quotation marks
  - Ruby is an interpreted language
LinuxDevCenter.com -- An Interview with the Creator of Ruby

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learn ruby on 2007-10-23 and saved by 4 people
- Ruby has been described as an absolutely pure object-oriented scripting language and a genuine attempt to combine the best of everything in the scripting world.
- Yukihiro Matsumoto (or "Matz" as he's known online) is the creator of Ruby
Ruby Installation: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23 and saved by 2 people
- Yukihiro Matsumoto, commonly known as 'Matz' created the Ruby language in 1993
Ruby Introduction: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23 and saved by 3 people
rubylearning.com :: View topic - Lesson 1

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learn ruby on 2007-10-23 and saved by 2 people
- We shall be referring to the documentation here - http://www.ruby-doc.org/core/
- Constants begin with capital letters. Example PI, Length
RubyLearning Chatroom (at Lingr) > Archives > Recent messages

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learn ruby on 2007-10-22
Ruby Mentor, Guide: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

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learn ruby on 2007-10-23
- It is my observation that if one learns a programming language along with a group and with set targets every day; one learns faster.
Ruby Study Notes - Best Ruby Tutorial for Learning Ruby

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learn ruby on 2007-10-23 and saved by 47 people
- RubyLearning.com is a thorough collection of Ruby Study Notes for those who are new to the Ruby programming language and in search of a solid introduction to Ruby's concepts and constructs - ruby-lang.org.
Ruby From Other Languages

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ruby selenium on 2007-09-24 and saved by 3 people
- an identifier starts with a capital letter,
  it is a constant
- starts with @, it is an instance variable
- 7 more annotations...
- - starts with a dollar sign ($), it is a global variable
  - starts with @@,
    it is a class variable.
  - start with capital letters
  - Method names
  - Ruby doesn’t have keyword parameters,
  - In Ruby, everything except nil and false is considered true.
  - Singleton methods are per-object methods. They are only available on the
    Object you defined it on.
Ruby in Twenty Minutes

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ruby selenium on 2007-09-24 and saved by 5 people
- In Ruby, anything on a line after a hash mark is a
  comment and is ignored by the interpreter
- __FILE__ is the magic variable that contains the name of the current
  file.
- 1 more annotations...
- - $0 is the name of the file used to start the program.
Ruby in Twenty Minutes

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ruby selenium on 2007-09-24 and saved by 3 people
- Ruby uses the good object-oriented approach of keeping data sort-of
  hidden away.
Ruby in Twenty Minutes

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ruby selenium on 2007-09-24 and saved by 2 people
- Ruby’s response => nil tells
  us that it knows we’re done defining the method
- h to take a name as a parameter.
- 2 more annotations...
- - saying is “If the name isn’t
    supplied, use the default name of "World"”.
  - @name.
    This is an instance variable, and is available to all the methods of
    the class
Ruby in Twenty Minutes

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ruby selenium on 2007-09-24 and saved by 32 people
- puts always
  returns nil, which is Ruby’s absolutely-positively-nothing value.
- puts is the basic command to print something out in Ruby.
- 2 more annotations...
- - In Ruby ** is the way you say “to the power of”
  - floating-point number.

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swan lin

18 items | 106 visits

start to study ruby

Updated on 2008-03-15
Created on 2007-09-25

Category: Schools & Education

ruby study

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swan lin's List: Ruby Stduy

Lesson Cover :rubylearning.com :: View topic - Important: Read This First

Variables and Assignments: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

Fun with Strings: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

Numbers in Ruby: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

Ruby Features: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

First Ruby Program: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

LinuxDevCenter.com -- An Interview with the Creator of Ruby

Ruby Installation: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

Ruby Introduction: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

rubylearning.com :: View topic - Lesson 1

RubyLearning Chatroom (at Lingr) > Archives > Recent messages

Ruby Mentor, Guide: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

Ruby Study Notes - Best Ruby Tutorial for Learning Ruby

Ruby From Other Languages

Ruby in Twenty Minutes

Ruby in Twenty Minutes

Ruby in Twenty Minutes

Ruby in Twenty Minutes

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