One line infinite for loop in Ruby?

Ruby
1

Hi all,

How to write one line infinte for loop in Ruby?
I don’t want loop{}.

Regards,
Anil W.

2

On 9/5/06, Anil W. [email protected] wrote:

Hi all,

How to write one line infinte for loop in Ruby?
I don’t want loop{}.

How about:
while 1 do puts “OMG” end

hth,
-Harold

3

On 9/5/06, Harold H. [email protected] wrote:

On 9/5/06, Anil W. [email protected] wrote:

Hi all,

How to write one line infinte for loop in Ruby?
I don’t want loop{}.

How about:
while 1 do puts “OMG” end

Even better:

puts “OMG” while 1

4

quoth the Harold H.:

On 9/5/06, Anil W. [email protected] wrote:

Hi all,

How to write one line infinte for loop in Ruby?
I don’t want loop{}.

How about:
while 1 do puts “OMG” end

I have been wondering, is there a no-op in Ruby? Then you could do like
in
Python:

while 1: pass

hth,
-Harold

-d

5

On 9/5/06, darren kirby [email protected] wrote:

I have been wondering, is there a no-op in Ruby? Then you could do like in
Python:

while 1: pass

nil while true

-austin

6

quoth the Austin Z.:

On 9/5/06, darren kirby [email protected] wrote:

I have been wondering, is there a no-op in Ruby? Then you could do like
in Python:

while 1: pass

nil while true

Cool, thanks.

I’ve just realized you don’t even need the ‘nil’ to flesh out some
syntactically valid functions/methods/case statements that do nothing:

irb(main):005:0> def foobar
irb(main):006:1> end
=> nil

irb(main):010:0> x = 1
irb(main):011:0> if x == 2
irb(main):012:1> puts “Two!”
irb(main):013:1> elsif x == 1 # do nothing
irb(main):014:1> else
irb(main):015:1* puts “Not 1 or 2”
irb(main):016:1> end
=> nil

technically they return nil but that is incidental…

-austin

-d

7

I have been wondering, is there a no-op in Ruby? Then you could do
while 1: pass
nil while true
while true; end

…wait. Why are we doing this? And why are we disallowed from using
loop{}? Okay, here’s another:
alias repeat loop; repeat{}
Or:
(1…1.0/0)…each{}
How about:
callcc{|$cc|};$cc[]

Shall I continue, Anil?

Devin

8

On Sep 5, 2006, at 11:26 PM, Devin M. wrote:

Devin

Heres another one:

(a = lambda { a.call }).call

Of course this is one infinite loop that will probably terminate.

9

On 9/6/06, Devin M. [email protected] wrote:

(1…1.0/0)…each{}
How about:
callcc{|$cc|};$cc[]

Shall I continue, Anil?\

Yes! You can continue!

Devin

Regards,
Anil W.

10

Austin Z. wrote:

On 9/5/06, darren kirby [email protected] wrote:

I have been wondering, is there a no-op in Ruby? Then you could do
like in
Python:

while 1: pass

nil while true

Golfing slightly and not very interestingly:

0while 0

(that’s not a syntax error, oddly)

11

Anil W. wrote:

On 9/6/06, Devin M. [email protected] wrote:

Shall I continue, Anil?
Yes! You can continue!
Err… okay, I can think of another:
raise rescue retry

Wow… that one’s pretty elegant. This one much less so:
1.times { redo }

I’m out… maybe something cute with threads, or throw/catch, or ensure?

Is there a reason for your question? Just a ruby-talk game?

Devin

12

Here’s an ultimate one, just to make sure :slight_smile:

while 1
nil while 1 && 1.times {redo} && raise rescue retry
end

Best,
Mike D.
http://www.rubywizards.com