Ruby in Twenty Minutes - The Diigo Meta page

• 11 May 12
  

  Ismurg M
• 16 Apr 12
  

  wildahunden

  ruby introduction

• 19 Feb 11
  

  Walter Whinnery
  • In Ruby, anything on a line after a hash mark is a comment and is ignored by the interpreter.
  • each is a method that accepts a block of code then runs that block of code for every element in a list
  • block is like an anonymous function or lambda. The variable between pipe characters is the parameter for this block
  • What happens here is that for every entry in a list, name is bound to that list element, and then the expression puts "Hello #{name}!" is run with that name.
  • all the housekeeping details are hidden within the each method, all you need to do is to tell it what to do with each element. Internally, the each method will essentially call yield "Albert", then yield "Brenda" and then yield "Charles",  and so on
  • real power of blocks is when dealing with things that are more complicated than lists.
  • you can also handle setup, teardown, and errors—all hidden away from the cares of the user
  • say_bye method doesn’t use each, instead it checks to see if @names responds to the join method, and if so, uses it.

  6 more annotations...

• 07 Jul 10
  

  Parin Sharma
  • notice the initial lines, which begin with a hash mark (#)
  • Ruby, anything on a line after a hash mark is a comment and is ignored by the interpreter. Th
  • The variable between pipe characters is the parameter for this block.

  1 more annotation...

• 13 Nov 09
  

  Rick Toews

  ruby tutorial

• 24 Sep 09
  

  Kenyth Zeng
  • @names.each do |name|
      puts "Hello #{name}!"
    end
  • each is a method that accepts a block of code then runs that block of code for every element in a list, and the bit between do and end is just such a block. A block is like an anonymous function or lambda. The variable between pipe characters is the parameter for this block.
• 28 Jul 09
  

  martinchilvers

  ruby tutorials programming

• 24 Sep 07
  

  swan lin

  ruby selenium

  • 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.
  • $0 is the name of the file used to start the program.

  1 more annotation...

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