Creating an Infinite Loop
16
I'm trying to create an infinite loop, where a block of code will be executed forever.
All loop documentation i have found warns against creating an infinite loop, but no examples of a working one.
If I have a block of code:
{ puts "foo"
puts "bar"
sleep 300 }
How would I go about running this block forever?
ruby
edited Nov 26 '14 at 7:28
vgoff
8,20122848
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
add a comment |
16
I'm trying to create an infinite loop, where a block of code will be executed forever.
All loop documentation i have found warns against creating an infinite loop, but no examples of a working one.
If I have a block of code:
{ puts "foo"
puts "bar"
sleep 300 }
How would I go about running this block forever?
ruby
edited Nov 26 '14 at 7:28
vgoff
8,20122848
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
6
You've tagged thisruby-on-rails. If you're trying to create an infinite loop in Rails, you're probably doing something horribly wrong. You can't do that in the same process that is serving your site, or the single thread of execution cannot actually respond to incoming requests. If you want to do something every 300 seconds, you need an asynchronous background job. You should describe your actual problem so we can provide you with real advice - using an infinite loop is a solution, not a problem.
– meagar♦
Nov 26 '14 at 1:49
1
Thank you for clarifying. This loop is not being used for rails. I have removed the tag. Thanks for the explanation!
– Andrew Walz
Nov 26 '14 at 2:18
add a comment |
16
16
16
0
I'm trying to create an infinite loop, where a block of code will be executed forever.
All loop documentation i have found warns against creating an infinite loop, but no examples of a working one.
If I have a block of code:
{ puts "foo"
puts "bar"
sleep 300 }
How would I go about running this block forever?
ruby
edited Nov 26 '14 at 7:28
vgoff
8,20122848
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
I'm trying to create an infinite loop, where a block of code will be executed forever.
All loop documentation i have found warns against creating an infinite loop, but no examples of a working one.
If I have a block of code:
{ puts "foo"
puts "bar"
sleep 300 }
How would I go about running this block forever?
ruby
ruby
edited Nov 26 '14 at 7:28
vgoff
8,20122848
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
edited Nov 26 '14 at 7:28
vgoff
8,20122848
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
edited Nov 26 '14 at 7:28
vgoff
8,20122848
edited Nov 26 '14 at 7:28
vgoff
8,20122848
edited Nov 26 '14 at 7:28
vgoff
8,20122848
8,20122848
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
asked Nov 26 '14 at 1:39
Andrew WalzAndrew Walz
3972318
3972318
6
You've tagged thisruby-on-rails. If you're trying to create an infinite loop in Rails, you're probably doing something horribly wrong. You can't do that in the same process that is serving your site, or the single thread of execution cannot actually respond to incoming requests. If you want to do something every 300 seconds, you need an asynchronous background job. You should describe your actual problem so we can provide you with real advice - using an infinite loop is a solution, not a problem.
– meagar♦
Nov 26 '14 at 1:49
1
Thank you for clarifying. This loop is not being used for rails. I have removed the tag. Thanks for the explanation!
– Andrew Walz
Nov 26 '14 at 2:18
add a comment |
6
You've tagged thisruby-on-rails. If you're trying to create an infinite loop in Rails, you're probably doing something horribly wrong. You can't do that in the same process that is serving your site, or the single thread of execution cannot actually respond to incoming requests. If you want to do something every 300 seconds, you need an asynchronous background job. You should describe your actual problem so we can provide you with real advice - using an infinite loop is a solution, not a problem.
– meagar♦
Nov 26 '14 at 1:49
1
Thank you for clarifying. This loop is not being used for rails. I have removed the tag. Thanks for the explanation!
– Andrew Walz
Nov 26 '14 at 2:18
6
6
You've tagged this
ruby-on-rails. If you're trying to create an infinite loop in Rails, you're probably doing something horribly wrong. You can't do that in the same process that is serving your site, or the single thread of execution cannot actually respond to incoming requests. If you want to do something every 300 seconds, you need an asynchronous background job. You should describe your actual problem so we can provide you with real advice - using an infinite loop is a solution, not a problem.– meagar♦
Nov 26 '14 at 1:49
You've tagged this
ruby-on-rails. If you're trying to create an infinite loop in Rails, you're probably doing something horribly wrong. You can't do that in the same process that is serving your site, or the single thread of execution cannot actually respond to incoming requests. If you want to do something every 300 seconds, you need an asynchronous background job. You should describe your actual problem so we can provide you with real advice - using an infinite loop is a solution, not a problem.– meagar♦
Nov 26 '14 at 1:49
1
1
Thank you for clarifying. This loop is not being used for rails. I have removed the tag. Thanks for the explanation!
– Andrew Walz
Nov 26 '14 at 2:18
Thank you for clarifying. This loop is not being used for rails. I have removed the tag. Thanks for the explanation!
– Andrew Walz
Nov 26 '14 at 2:18
add a comment |
4 Answers
4
active
oldest
votes
25
loop do
puts 'foo'
puts 'bar'
sleep 300
end
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
Upvoted for a correct answer, but the best answer is probably still @meagar's in question comments. :)
– Amadan
Nov 26 '14 at 2:10
add a comment |
14
Here are some examples of infinite loops using blocks.
Loop
loop do
puts "foo"
puts "bar"
sleep 300
end
While
while true
puts "foo"
puts "bar"
sleep 300
end
Until
until false
puts "foo"
puts "bar"
sleep 300
end
Lambda
-> { puts "foo" ; puts "bar" ; sleep 300}.call until false
There are a few variations of the lambda as well, using the non-stabby lambda syntax. Also we could use a Proc.
Begin..End
begin
puts "foo"
puts "bar"
sleep 300
end while false
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
add a comment |
0
I have tried all but with inputs loop only worked as infinty loop till I get a valid input:
loop do
a = gets.to_i
if (a >= 2)
break
else
puts "Invalid Input, Please enter a correct Value >=2: "
end
end
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
add a comment |
-3
1) While loop:
While 1==1 # As the condition 1 is equal to 1 is true, it always runs.
puts "foo"
puts "bar"
sleep 300
end
2) Recursion :
def infiniteLoop # Using recursion concept
puts "foo"
puts "bar"
sleep 300
infiniteLoop #Calling this method again
end
EDIT : I thought this would work, but as Gabriel mentioned, we would get SystemStackError.
3) Loop
loop do
puts "foo"
....
end
4) Using unless
unless 1 == 2 # Unless 1 is equal to 2 , it keeps running
puts "foo"
...
end
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
4
unlessis not a loop construct, it is a synonym forif not. You might have been thinking ofuntil, a synonym forwhile not. And while we're onwhile, Ruby is case-sensitive:Whileis an undefined constant, and not a keyword likewhileis; and as a keyword, it does not accept a block, sowhile ... dois a syntax error as well.
– Amadan
Nov 26 '14 at 2:08
2
The recursion alternative will not work as with each iteration you're adding a level to the stack and eventually aSystemStackErrorwill be raised.
– Gabriel de Oliveira
Nov 26 '14 at 2:25
Thank you guys, about corrections.
– Rahul Dess
Nov 26 '14 at 2:43
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
25
loop do
puts 'foo'
puts 'bar'
sleep 300
end
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
Upvoted for a correct answer, but the best answer is probably still @meagar's in question comments. :)
– Amadan
Nov 26 '14 at 2:10
add a comment |
25
loop do
puts 'foo'
puts 'bar'
sleep 300
end
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
Upvoted for a correct answer, but the best answer is probably still @meagar's in question comments. :)
– Amadan
Nov 26 '14 at 2:10
add a comment |
25
25
25
loop do
puts 'foo'
puts 'bar'
sleep 300
end
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
loop do
puts 'foo'
puts 'bar'
sleep 300
end
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
answered Nov 26 '14 at 1:41
Todd A. JacobsTodd A. Jacobs
56.2k1192159
56.2k1192159
Upvoted for a correct answer, but the best answer is probably still @meagar's in question comments. :)
– Amadan
Nov 26 '14 at 2:10
add a comment |
Upvoted for a correct answer, but the best answer is probably still @meagar's in question comments. :)
– Amadan
Nov 26 '14 at 2:10
Upvoted for a correct answer, but the best answer is probably still @meagar's in question comments. :)
– Amadan
Nov 26 '14 at 2:10
Upvoted for a correct answer, but the best answer is probably still @meagar's in question comments. :)
– Amadan
Nov 26 '14 at 2:10
add a comment |
14
Here are some examples of infinite loops using blocks.
Loop
loop do
puts "foo"
puts "bar"
sleep 300
end
While
while true
puts "foo"
puts "bar"
sleep 300
end
Until
until false
puts "foo"
puts "bar"
sleep 300
end
Lambda
-> { puts "foo" ; puts "bar" ; sleep 300}.call until false
There are a few variations of the lambda as well, using the non-stabby lambda syntax. Also we could use a Proc.
Begin..End
begin
puts "foo"
puts "bar"
sleep 300
end while false
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
add a comment |
14
Here are some examples of infinite loops using blocks.
Loop
loop do
puts "foo"
puts "bar"
sleep 300
end
While
while true
puts "foo"
puts "bar"
sleep 300
end
Until
until false
puts "foo"
puts "bar"
sleep 300
end
Lambda
-> { puts "foo" ; puts "bar" ; sleep 300}.call until false
There are a few variations of the lambda as well, using the non-stabby lambda syntax. Also we could use a Proc.
Begin..End
begin
puts "foo"
puts "bar"
sleep 300
end while false
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
add a comment |
14
14
14
Here are some examples of infinite loops using blocks.
Loop
loop do
puts "foo"
puts "bar"
sleep 300
end
While
while true
puts "foo"
puts "bar"
sleep 300
end
Until
until false
puts "foo"
puts "bar"
sleep 300
end
Lambda
-> { puts "foo" ; puts "bar" ; sleep 300}.call until false
There are a few variations of the lambda as well, using the non-stabby lambda syntax. Also we could use a Proc.
Begin..End
begin
puts "foo"
puts "bar"
sleep 300
end while false
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
Here are some examples of infinite loops using blocks.
Loop
loop do
puts "foo"
puts "bar"
sleep 300
end
While
while true
puts "foo"
puts "bar"
sleep 300
end
Until
until false
puts "foo"
puts "bar"
sleep 300
end
Lambda
-> { puts "foo" ; puts "bar" ; sleep 300}.call until false
There are a few variations of the lambda as well, using the non-stabby lambda syntax. Also we could use a Proc.
Begin..End
begin
puts "foo"
puts "bar"
sleep 300
end while false
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
edited May 17 '17 at 0:47
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
answered Nov 26 '14 at 6:54
vgoffvgoff
8,20122848
8,20122848
add a comment |
add a comment |
0
I have tried all but with inputs loop only worked as infinty loop till I get a valid input:
loop do
a = gets.to_i
if (a >= 2)
break
else
puts "Invalid Input, Please enter a correct Value >=2: "
end
end
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
add a comment |
0
I have tried all but with inputs loop only worked as infinty loop till I get a valid input:
loop do
a = gets.to_i
if (a >= 2)
break
else
puts "Invalid Input, Please enter a correct Value >=2: "
end
end
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
add a comment |
0
0
0
I have tried all but with inputs loop only worked as infinty loop till I get a valid input:
loop do
a = gets.to_i
if (a >= 2)
break
else
puts "Invalid Input, Please enter a correct Value >=2: "
end
end
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
I have tried all but with inputs loop only worked as infinty loop till I get a valid input:
loop do
a = gets.to_i
if (a >= 2)
break
else
puts "Invalid Input, Please enter a correct Value >=2: "
end
end
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
answered Jan 1 at 1:17
Abdelrahman FaragAbdelrahman Farag
30123
30123
add a comment |
add a comment |
-3
1) While loop:
While 1==1 # As the condition 1 is equal to 1 is true, it always runs.
puts "foo"
puts "bar"
sleep 300
end
2) Recursion :
def infiniteLoop # Using recursion concept
puts "foo"
puts "bar"
sleep 300
infiniteLoop #Calling this method again
end
EDIT : I thought this would work, but as Gabriel mentioned, we would get SystemStackError.
3) Loop
loop do
puts "foo"
....
end
4) Using unless
unless 1 == 2 # Unless 1 is equal to 2 , it keeps running
puts "foo"
...
end
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
4
unlessis not a loop construct, it is a synonym forif not. You might have been thinking ofuntil, a synonym forwhile not. And while we're onwhile, Ruby is case-sensitive:Whileis an undefined constant, and not a keyword likewhileis; and as a keyword, it does not accept a block, sowhile ... dois a syntax error as well.
– Amadan
Nov 26 '14 at 2:08
2
The recursion alternative will not work as with each iteration you're adding a level to the stack and eventually aSystemStackErrorwill be raised.
– Gabriel de Oliveira
Nov 26 '14 at 2:25
Thank you guys, about corrections.
– Rahul Dess
Nov 26 '14 at 2:43
add a comment |
-3
1) While loop:
While 1==1 # As the condition 1 is equal to 1 is true, it always runs.
puts "foo"
puts "bar"
sleep 300
end
2) Recursion :
def infiniteLoop # Using recursion concept
puts "foo"
puts "bar"
sleep 300
infiniteLoop #Calling this method again
end
EDIT : I thought this would work, but as Gabriel mentioned, we would get SystemStackError.
3) Loop
loop do
puts "foo"
....
end
4) Using unless
unless 1 == 2 # Unless 1 is equal to 2 , it keeps running
puts "foo"
...
end
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
4
unlessis not a loop construct, it is a synonym forif not. You might have been thinking ofuntil, a synonym forwhile not. And while we're onwhile, Ruby is case-sensitive:Whileis an undefined constant, and not a keyword likewhileis; and as a keyword, it does not accept a block, sowhile ... dois a syntax error as well.
– Amadan
Nov 26 '14 at 2:08
2
The recursion alternative will not work as with each iteration you're adding a level to the stack and eventually aSystemStackErrorwill be raised.
– Gabriel de Oliveira
Nov 26 '14 at 2:25
Thank you guys, about corrections.
– Rahul Dess
Nov 26 '14 at 2:43
add a comment |
-3
-3
-3
1) While loop:
While 1==1 # As the condition 1 is equal to 1 is true, it always runs.
puts "foo"
puts "bar"
sleep 300
end
2) Recursion :
def infiniteLoop # Using recursion concept
puts "foo"
puts "bar"
sleep 300
infiniteLoop #Calling this method again
end
EDIT : I thought this would work, but as Gabriel mentioned, we would get SystemStackError.
3) Loop
loop do
puts "foo"
....
end
4) Using unless
unless 1 == 2 # Unless 1 is equal to 2 , it keeps running
puts "foo"
...
end
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
1) While loop:
While 1==1 # As the condition 1 is equal to 1 is true, it always runs.
puts "foo"
puts "bar"
sleep 300
end
2) Recursion :
def infiniteLoop # Using recursion concept
puts "foo"
puts "bar"
sleep 300
infiniteLoop #Calling this method again
end
EDIT : I thought this would work, but as Gabriel mentioned, we would get SystemStackError.
3) Loop
loop do
puts "foo"
....
end
4) Using unless
unless 1 == 2 # Unless 1 is equal to 2 , it keeps running
puts "foo"
...
end
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
edited Nov 26 '14 at 2:42
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
answered Nov 26 '14 at 1:55
Rahul DessRahul Dess
7831930
7831930
4
unlessis not a loop construct, it is a synonym forif not. You might have been thinking ofuntil, a synonym forwhile not. And while we're onwhile, Ruby is case-sensitive:Whileis an undefined constant, and not a keyword likewhileis; and as a keyword, it does not accept a block, sowhile ... dois a syntax error as well.
– Amadan
Nov 26 '14 at 2:08
2
The recursion alternative will not work as with each iteration you're adding a level to the stack and eventually aSystemStackErrorwill be raised.
– Gabriel de Oliveira
Nov 26 '14 at 2:25
Thank you guys, about corrections.
– Rahul Dess
Nov 26 '14 at 2:43
add a comment |
4
unlessis not a loop construct, it is a synonym forif not. You might have been thinking ofuntil, a synonym forwhile not. And while we're onwhile, Ruby is case-sensitive:Whileis an undefined constant, and not a keyword likewhileis; and as a keyword, it does not accept a block, sowhile ... dois a syntax error as well.
– Amadan
Nov 26 '14 at 2:08
2
The recursion alternative will not work as with each iteration you're adding a level to the stack and eventually aSystemStackErrorwill be raised.
– Gabriel de Oliveira
Nov 26 '14 at 2:25
Thank you guys, about corrections.
– Rahul Dess
Nov 26 '14 at 2:43
4
4
unless is not a loop construct, it is a synonym for if not. You might have been thinking of until, a synonym for while not. And while we're on while, Ruby is case-sensitive: While is an undefined constant, and not a keyword like while is; and as a keyword, it does not accept a block, so while ... do is a syntax error as well.– Amadan
Nov 26 '14 at 2:08
unless is not a loop construct, it is a synonym for if not. You might have been thinking of until, a synonym for while not. And while we're on while, Ruby is case-sensitive: While is an undefined constant, and not a keyword like while is; and as a keyword, it does not accept a block, so while ... do is a syntax error as well.– Amadan
Nov 26 '14 at 2:08
2
2
The recursion alternative will not work as with each iteration you're adding a level to the stack and eventually a
SystemStackError will be raised.– Gabriel de Oliveira
Nov 26 '14 at 2:25
The recursion alternative will not work as with each iteration you're adding a level to the stack and eventually a
SystemStackError will be raised.– Gabriel de Oliveira
Nov 26 '14 at 2:25
Thank you guys, about corrections.
– Rahul Dess
Nov 26 '14 at 2:43
Thank you guys, about corrections.
– Rahul Dess
Nov 26 '14 at 2:43
add a comment |
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6
You've tagged this
ruby-on-rails. If you're trying to create an infinite loop in Rails, you're probably doing something horribly wrong. You can't do that in the same process that is serving your site, or the single thread of execution cannot actually respond to incoming requests. If you want to do something every 300 seconds, you need an asynchronous background job. You should describe your actual problem so we can provide you with real advice - using an infinite loop is a solution, not a problem.– meagar♦
Nov 26 '14 at 1:49
1
Thank you for clarifying. This loop is not being used for rails. I have removed the tag. Thanks for the explanation!
– Andrew Walz
Nov 26 '14 at 2:18