# Bound macro in ruby **URL:** \ **Category:** Ruby\ **Created:** [October 24, 2008, 11:37am UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683 "2008-10-24T11:37:52Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 11:37am UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/1 "2008-10-24T11:37:52Z")
Hi all, I think it’s a simple question but I couldn’t find in docs. Is there a macro already defined in ruby for returning the “bound” of a value: ex: BOUND(1, 5, 10) =\> 5 BOUND(10, 5, 100) =\> 5 BOUND(1, 50, 10) =\> 10 ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 1:01pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/2 "2008-10-24T13:01:24Z")
2008/10/24 Me Me [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > I think it’s a simple question but I couldn’t find in docs. > Is there a macro already defined in ruby for returning the “bound” of a > value: > > ex: > > BOUND(1, 5, 10) =\> 5 > BOUND(10, 5, 100) =\> 5 > BOUND(1, 50, 10) =\> 10 First of all, there are no macros in Ruby. If anything you would be looking for a method (or function). How is your “bound” defined? Cheers robert ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 2:07pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/3 "2008-10-24T14:07:08Z")
On Fri, Oct 24, 2008 at 13:19, Me Me [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > thanks for answering: > > in my case it’s something I can easy implement with if-clause, but I > wanted to know if this could be done in one single line def bound(min, value, max) (value \> max) ? max : ((value \< min) ? min : value end I propose replacing \> with \>=, because in case when value==max it will be evaluated faster def bound(min, value, max) (value \>= max) ? max : ((value \< min) ? min : value end ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 2:12pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/4 "2008-10-24T14:12:59Z")
2008/10/24 Me Me [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > if(value \< min) > return min > end > > return value > > end irb(main):001:0\> def BOUND(min,val,max) val \>=max ? max : val \< min ? min : val end =\> nil irb(main):002:0\> BOUND(10,0,100) =\> 10 irb(main):003:0\> irb(main):004:0\* BOUND(10,200,100) =\> 100 irb(main):005:0\> BOUND(10,150,100) =\> 100 irb(main):006:0\> BOUND(10,50,100) =\> 50 Cheers robert ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 2:20pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/5 "2008-10-24T14:20:23Z")
thanks all I though it was something already implemented inside ruby, I guess the same for MIN, MAX bye ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 1:18pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/6 "2008-10-24T13:18:58Z")
thanks for answering: in my case it’s something I can easy implement with if-clause, but I wanted to know if this could be done in one single line def bound(min, value, max) if(value \> max) return max end if(value \< min) return min end return value end Robert K. wrote: > 2008/10/24 Me Me [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > > > I think it’s a simple question but I couldn’t find in docs. > > Is there a macro already defined in ruby for returning the “bound” of a > > value: > > > > ex: > > > > BOUND(1, 5, 10) =\> 5 > > BOUND(10, 5, 100) =\> 5 > > BOUND(1, 50, 10) =\> 10 > > First of all, there are no macros in Ruby. If anything you would be > looking for a method (or function). How is your “bound” defined? > > Cheers > > robert ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 5:21pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/7 "2008-10-24T17:21:29Z")
2008/10/24 Me Me [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > I though it was something already implemented inside ruby, I guess the > same for MIN, MAX If you want to use #min and #max then you can def bound(min, val, max) [[val, max].min, min].max end Regards, Pit ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 3:12pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/8 "2008-10-24T15:12:57Z")
Me Me wrote: > I though it was something already implemented inside ruby If it existed, I would expect to find it as Range#clip or something like that. But I don’t think it does. class Range def clip(v) v \< first ? first : v \> last ? last : v end end p (1…10).clip(5) # 5 p (10…100).clip(5) # 10 (different to your original post??) p (1…10).clip(50) # 10 It wouldn’t surprise me if something like this existed in the facets library though. > I guess the same for MIN, MAX irb(main):001:0\> [20,40].min =\> 20 irb(main):002:0\> [20,40,30].min =\> 20 irb(main):003:0\> [20,40,30].max =\> 40 ---
**Author:** ![melmoth](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/9de053/32.png) [@melmoth](https://www.ruby-forum.com/u/melmoth)\ **Post date:** [October 24, 2008, 6:05pm UTC](https://www.ruby-forum.com/t/bound-macro-in-ruby/151683/9 "2008-10-24T18:05:34Z")
On Sat, Oct 25, 2008 at 12:20 AM, Pit C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > 2008/10/24 Me Me [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > > > I though it was something already implemented inside ruby, I guess the > > same for MIN, MAX Another way is to use sorting: [min, val, max].sort[1]