# Ruby Puzzle Challenge

Discussion in 'Ruby' started by Wyatt Greene, Jan 30, 2008.

1. ### Wyatt GreeneGuest

Write a Ruby program that prints out the numbers 1 to 100, one number
per line. The program must be less than 10 characters long.

Good luck!
Wyatt Greene

Wyatt Greene, Jan 30, 2008

2. ### Lee JarvisGuest

On Jan 30, 9:14 pm, Wyatt Greene <> wrote:
> Write a Ruby program that prints out the numbers 1 to 100, one number
> per line.  The program must be less than 10 characters long.
>
> Good luck!
> Wyatt Greene

Well, just for the crack..

p *1..100

Lee Jarvis, Jan 30, 2008

3. ### Sebastian HungereckerGuest

Wyatt Greene wrote:
> Write a Ruby program that prints out the numbers 1 to 100, one number
> per line. The program must be less than 10 characters long.

Does this have some kind of spoiler-period like the ruby quiz? Well, since it
didn't say so in the OP and anyone who wants to solve it on his own can just
not read the replies until he's done, here it goes:

p *1..100
or one char shorter:
p *1..?d

--
NP: Explosions in the Sky- With Tired Eyes, Tired Minds, Tired Souls, We Slept
Jabber:
ICQ: 205544826

Sebastian Hungerecker, Jan 30, 2008
4. ### Wyatt GreeneGuest

I was thinking of p *1..100

I'm am truly amazed that this could be squeezed down even further to p
*1..?d

That leads me to wonder...is it possible to squeeze this program down
into 7 characters?

On Jan 30, 4:27 pm, Sebastian Hungerecker <>
wrote:
> Wyatt Greene wrote:
> > Write a Ruby program that prints out the numbers 1 to 100, one number
> > per line. The program must be less than 10 characters long.

>
> Does this have some kind of spoiler-period like the ruby quiz? Well, since it
> didn't say so in the OP and anyone who wants to solve it on his own can just
> not read the replies until he's done, here it goes:
>
> p *1..100
> or one char shorter:
> p *1..?d
>
> --
> NP: Explosions in the Sky- With Tired Eyes, Tired Minds, Tired Souls, We Slept
> Jabber:
> ICQ: 205544826

Wyatt Greene, Jan 30, 2008
5. ### Dominik HonnefGuest

On [Thu, 31.01.2008 06:24], Lee Jarvis wrote:
> On Jan 30, 9:14 pm, Wyatt Greene <> wrote:
> > Write a Ruby program that prints out the numbers 1 to 100, one number
> > per line.  The program must be less than 10 characters long.
> >
> > Good luck!
> > Wyatt Greene

>
> Lol whats this all about?
>
> Well, just for the crack..
>
> p *1..100

Would you be so gentle and explain this piece of code to me?
I know things like p "a"*10, but I dont really understand your code.
I know that 1..100 describes a range, but... isn't * a binary operator? I don't really see the first/second operand

--
Dominik Honnef

Dominik Honnef, Jan 30, 2008
6. ### Sebastian HungereckerGuest

Dominik Honnef wrote:
> > p *1..100

>
> Would you be so gentle and explain this piece of code to me?
> [...] isn't * a binary operator? I

* can be a binary operator, yes, but here it is the unary, prefix
splat-operator which takes an array or any object that responds to
to_a and turns it into a list of arguments:
foo(*[:la,:li,:lu]) becomes foola,:li,:lu)
p *1..5 becomes p 1,2,3,4,5

HTH,
Sebastian
--
Jabber:
ICQ: 205544826

Sebastian Hungerecker, Jan 30, 2008
7. ### Wyatt GreeneGuest

This is the problem with writing "clever" code...it's unreadable!

The * operator used here is a unary operator that is used to convert
an array into a list of arguments. For example, say you had this
method:

def say(a, b, c)
puts a
puts b
puts c
end

arr = [1, 2, 3]

As a convenience, Ruby lets you pass each element of the array as a
separate argument into the method by using the * operator:

say(*arr)

In the case of p *1..100, the trick seems to work for a range, too.

On Jan 30, 4:36 pm, Dominik Honnef <> wrote:
> On [Thu, 31.01.2008 06:24], Lee Jarvis wrote:
>
> > On Jan 30, 9:14 pm, Wyatt Greene <> wrote:
> > > Write a Ruby program that prints out the numbers 1 to 100, one number
> > > per line. The program must be less than 10 characters long.

>
> > > Good luck!
> > > Wyatt Greene

>
> > Lol whats this all about?

>
> > Well, just for the crack..

>
> > p *1..100

>
> Would you be so gentle and explain this piece of code to me?
> I know things like p "a"*10, but I dont really understand your code.
> I know that 1..100 describes a range, but... isn't * a binary operator? I don't really see the first/second operand
>
> --
> Dominik Honnef

Wyatt Greene, Jan 30, 2008
8. ### Dominik HonnefGuest

On [Thu, 31.01.2008 06:42], Sebastian Hungerecker wrote:
> Dominik Honnef wrote:
> > > p *1..100

> >
> > Would you be so gentle and explain this piece of code to me?
> > [...] isn't * a binary operator? I

>
>
> * can be a binary operator, yes, but here it is the unary, prefix
> splat-operator which takes an array or any object that responds to
> to_a and turns it into a list of arguments:
> foo(*[:la,:li,:lu]) becomes foola,:li,:lu)
> p *1..5 becomes p 1,2,3,4,5
>
>
> HTH,
> Sebastian
> --
> Jabber:
> ICQ: 205544826

Ah, yeah of course... I totally forgot about that.
If it had been puts(*[1,2,3...]) I wouldnt have asked that question :/
Actually, I'm using this feature a lot in my codes. But didn't know it takes any object,
which responds to #to_a

Thank you

(Okay, I forgot, that puts can take multiple arguments, too. Sometimes, Ruby is just too easy)
--
Dominik Honnef

Dominik Honnef, Jan 30, 2008
9. ### Lee JarvisGuest

On Jan 30, 9:36 pm, Dominik Honnef <> wrote:
> Would you be so gentle and explain this piece of code to me?
> I know things like p "a"*10, but I dont really understand your code.
> I know that 1..100 describes a range, but... isn't * a binary operator? I don't really see the first/second operand

Looks like Sebastian Hungerecker explained it before I could get
there. At least I got my post in second before him, hehe..
Well said, Sebastian.

Regards,
Lee

Lee Jarvis, Jan 30, 2008
10. ### Lionel BoutonGuest

Wyatt Greene wrote:
> I was thinking of p *1..100
>
> I'm am truly amazed that this could be squeezed down even further to p
> *1..?d
>
> That leads me to wonder...is it possible to squeeze this program down
> into 7 characters?
>

I tried another approach by relaxing your conditions a bit : the number
must all be printed out on the output but not one on each line.

p 2**975

works

ie the "output" verifies :
!(1..100).any? { |v| output !~ /#{v}/ }

Unfortunately there's no x**y solution to this condition where x and y
use less that 4 characters.

Still stuck with 8 chars :-/ I can't think of any other string or
numeric operator which can generate lots of data to print with little
input right now.

Lionel

Lionel Bouton, Jan 30, 2008
11. ### Wyatt GreeneGuest

On Jan 30, 6:01 pm, Lionel Bouton <>
wrote:
> Wyatt Greene wrote:
> > I was thinking of p *1..100

>
> > I'm am truly amazed that this could be squeezed down even further to p
> > *1..?d

>
> > That leads me to wonder...is it possible to squeeze this program down
> > into 7 characters?

>
> I tried another approach by relaxing your conditions a bit : the number
> must all be printed out on the output but not one on each line.
>
> p 2**975
>
> works
>
> ie the "output" verifies :
> !(1..100).any? { |v| output !~ /#{v}/ }
>
> Unfortunately there's no x**y solution to this condition where x and y
> use less that 4 characters.
>
> Still stuck with 8 chars :-/ I can't think of any other string or
> numeric operator which can generate lots of data to print with little
> input right now.
>
> Lionel

Wow, that's pretty creative, though!

Wyatt Greene, Jan 31, 2008
12. ### Judson LesterGuest

On Jan 30, 2008 1:35 PM, Wyatt Greene <> wrote:
> I was thinking of p *1..100
>
> I'm am truly amazed that this could be squeezed down even further to p
> *1..?d
>
> That leads me to wonder...is it possible to squeeze this program down
> into 7 characters?

>ruby -p -e '' < numbers

The ruby program is zero characters. You just have to set up the

Judson
--
Your subnet is currently 169.254.0.0/16. You are likely to be eaten by a grue.

Judson Lester, Jan 31, 2008
13. ### Drew OlsonGuest

Wyatt Greene wrote:
> Write a Ruby program that prints out the numbers 1 to 100, one number
> per line. The program must be less than 10 characters long.
>
> Good luck!
> Wyatt Greene

For more golf fun see: http://codegolf.com

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

Drew Olson, Jan 31, 2008
14. ### fedzorGuest

On Jan 30, 2008, at 4:14 PM, Wyatt Greene wrote:

> Write a Ruby program that prints out the numbers 1 to 100, one number
> per line. The program must be less than 10 characters long.

p *1..100