From: "jwmerrill@..." <jwmerrill@...>
Date: 2008-03-03T23:29:59+09:00
Subject: Re: Normal For Loop

On Mar 3, 9:10 am, Cory Cory <cg821...@ohio.edu> wrote:
> I'm new to Ruby.  Is there such thing as a C++ style (and most others)
> for loop in Ruby?  What I mean by that is:
>
> for( init, while-condition, increment ) { function-here }

for n in 1..10
    puts n
end

It seems more common in ruby to do things like

1.upto(10) {|n| puts n}

or

(1..10).each {|n| puts n}

If you mean that you want your condition and your increment to depend
on things that you won't know about until after the loop has been
running for a while, then yeah, you might have to use a while loop.
This doesn't seem to come up much, though.  Perhaps you could post a
specific example.

> I know I can do that with a while loop, but I enjoy the compactness of
> the above statement.  There are many times where Ruby's for-each loops
> just don't do the trick.

With a little creativity, not so many, in my experience.

> Also, is there anything like i++ or do I always have to do i=i+1 ?

i=i+1 is the way to do it.  There is some rationale for this, but I
don't remember what it is.

JM