From: "J. K." <jakekaiden@...>
Date: 2011-02-18T09:06:22+09:00
Subject: question re: small piece of code

Gaba Luschi wrote in post #982340:
> so the code knows that 'p' stands for 'people'? what if i used another
> letter, like n?

hi gaba -
  block variables work something like this...  if you set up an array:

array = [1, 2, 3, 4, 5]

  and then call a method that takes a block and block variables (like 
"find_all", or in my example, "each")

array.each{|n| puts n + 1}

  the "n" (or whatever you want to use as a variable, you could just as 
well use "array.each{|elephantballs| puts elephantballs + 1}") 
represents each index of the array, which are passed through the block 
{puts n+1},  and give you this:

2
3
4
5
6

  some methods provide for more than one block variable to be passed 
into a block, you can see things like:

@artBox.signal_connect("drag_data_received"){|widget, context, x, y, 
data, info, time| self.listDataDrop(data, y)}

  the 'signal_connect("drag_data_received")' method in Gtk2 provides for 
the following block variables - widget, context, x position, y position, 
data, info, and time (you could rename these to be anything you want, 
but they will still represent these elements, in this order.)  in my 
example, the only variables i pass on to be used in the block are the 
data, and y position, when i call "self.listDataDrop(data, y)" - but if 
i cared or needed to i could pass them all along to be used...

  don't worry, you'll get the hang of it...

  -jk

-- 
Posted via http://www.ruby-forum.com/.