From: Josef 'Jupp' SCHUGT <jupp@...>
Date: 2003-11-16T06:04:51+09:00
Subject: Re: substring: to the end of the string

Hi!

* KONTRA Gergely; 2003-11-14, 23:30 UTC:
> Is there any easiest way to get the substring starting from the 3rd
> character?
> 
> my solution:
> str[3..-1] which seems quite odd :-/
> 
> What if, intuitive, we can write
> str[3..]?
> 
> Any smarter solution?

Besids 'get used to -1'? Well, here's some extension to 'String'. I
did try my best to follow POLS. The intention is that left, right,
mid emulate BASIC's left$, right$ and mid$ while head and tail
without any arguments have the results they should have from a
functional programming point of view.

class String

  # 'number' leftmost chars
  def left(number = 1)
    self[0..number-1]
  end

  # 'number' rightmost chars
  def right(number = 1)
    self[-number..-1]
  end

  # 'number' chars starting at position 'from'
  def mid(from, number=1)
    self[from..from+number]
  end

  # chars from beginning to 'position'
  def head(position = 0)
    self[0..position]
  end

  # chars following 'position'
  def tail(position = 0)
    self[position+1..-1]
  end

end


Josef 'Jupp' Schugt
-- 
                        .-------.
message > 100 kB?   /   |       |
sender = spammer?  /    | R.I.P.|
text   = spam?    /  ___|       |___