From: bbqbaker <none@...>
Date: 2006-02-19T02:32:33+09:00
Subject: Understanding ruby? need help

I hi,
I am new to ruby and bought my first book. i am having sort of difficult
time understanding blocks/yeild statements. i am coming from C++.

class Array
  def find
    for i in 0..size
      value = self[i]
      return value if yield(value)
    end
    return nil
  end
end

[1,3,5,7,9].find {|v| v*v > 30}



-> 7

in the last line of code, it is passing to function find each number one
by one thats on the left? when it hits the "return value if
yield(value)" it will pass parameter value to the block and v will now
be equal to value, and then perform the code v*v > 30. if that is true,
it will get out of fuction find.


so what is in between the |" "| of the block is like in c++:

bool code_blk(int v)
{
  if (v * v > 30)
    return TRUE;
  else
    return FALSE;
}

is this kind of right?? thanks

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