# Range **URL:** \ **Category:** Ruby\ **Created:** [May 10, 2006, 9:14am UTC](https://www.ruby-forum.com/t/range/94656 "2006-05-10T09:14:56Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![ckonrad](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a4c791/32.png) [@ckonrad](https://www.ruby-forum.com/u/ckonrad)\ **Post date:** [May 10, 2006, 9:14am UTC](https://www.ruby-forum.com/t/range/94656/1 "2006-05-10T09:14:56Z")
another code example from my book doesnt work with the ruby interpreter parts = (“Part A” … “Part G”) parts.length #â??\> 7 that spits out a error that says it doesnt recognize the length method. I realize this question is pretty simple but i am a begining programmer. I am really enjoying the response time in this forum, i usually get a response in about 5 minutes any time of day 😃 ---
**Author:** ![ckonrad](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a4c791/32.png) [@ckonrad](https://www.ruby-forum.com/u/ckonrad)\ **Post date:** [May 10, 2006, 10:06am UTC](https://www.ruby-forum.com/t/range/94656/2 "2006-05-10T10:06:59Z")
corey konrad wrote: > another code example from my book doesnt work with the ruby interpreter > > parts = (“Part A” … “Part G”) > parts.length #â??\> 7 > > that spits out a error that says it doesnt recognize the length method. > > I realize this question is pretty simple but i am a begining programmer. > I am really enjoying the response time in this forum, i usually get a > response in about 5 minutes any time of day 😃 Try with [brackets] parts = [“Part A” , “Part B”, “Part G”] p parts.length #â??\> 7 Ytoba ---
**Author:** ![ckonrad](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a4c791/32.png) [@ckonrad](https://www.ruby-forum.com/u/ckonrad)\ **Post date:** [May 10, 2006, 10:09am UTC](https://www.ruby-forum.com/t/range/94656/3 "2006-05-10T10:09:46Z")
On 5/10/06, corey konrad [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > another code example from my book doesnt work with the ruby interpreter > > parts = (“Part A” … “Part G”) > parts.length #?\> 7 A range is a specification which can be used for making ordered lists (“lists” is not a ruby word). You can’t count the elements of a range because there aren’t any, except for the two objects specifying the beginning and end of the range. You can make a “list” from a range. In fact, you can make an array from a range and then count the objects in the array. For example: parts = (“Part A” … “Part G”) parts\_array = parts.to\_a parts.length # → 7 which can be shortened to “parts.to\_a.length”. ---
**Author:** ![ckonrad](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a4c791/32.png) [@ckonrad](https://www.ruby-forum.com/u/ckonrad)\ **Post date:** [May 10, 2006, 1:20pm UTC](https://www.ruby-forum.com/t/range/94656/4 "2006-05-10T13:20:38Z")
2006/5/10, stuart yarus [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > You can make a “list” from a range. In fact, you can make an array > from a range and then count the objects in the array. > > For example: > parts = (“Part A” … “Part G”) > parts\_array = parts.to\_a > parts.length # → 7 > > which can be shortened to “parts.to\_a.length”. Another nice way to do this is to use inject. IMHO this implementation could also go into Enumerable as a default implementation: > > (“Part A” … “Part G”).inject(0) {|s,| s+1} > > =\> 7 Kind regards robert ---
**Author:** ![ckonrad](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a4c791/32.png) [@ckonrad](https://www.ruby-forum.com/u/ckonrad)\ **Post date:** [May 10, 2006, 10:25am UTC](https://www.ruby-forum.com/t/range/94656/5 "2006-05-10T10:25:57Z")
stuart yarus wrote: > On 5/10/06, corey konrad [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > another code example from my book doesnt work with the ruby interpreter > > > > parts = (“Part A” … “Part G”) > > parts.length #�\> 7 > > A range is a specification which can be used for making ordered lists > (“lists” is not a ruby word). You can’t count the elements of a range > because there aren’t any, except for the two objects specifying the > beginning and end of the range. > > You can make a “list” from a range. In fact, you can make an array > from a range and then count the objects in the array. > > For example: > parts = (“Part A” … “Part G”) > parts\_array = parts.to\_a > parts.length # → 7 > > which can be shortened to “parts.to\_a.length”. hmm ok i guess the author made a mistake in this book i just wanted to check to make sure it wasnt a bug in my ruby or something. ---
**Author:** ![ckonrad](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/a4c791/32.png) [@ckonrad](https://www.ruby-forum.com/u/ckonrad)\ **Post date:** [May 10, 2006, 7:33pm UTC](https://www.ruby-forum.com/t/range/94656/6 "2006-05-10T19:33:12Z")
On May 10, 2006, at 12:15 AM, corey konrad wrote: > another code example from my book doesnt work with the ruby > interpreter > > parts = (“Part A” … “Part G”) > parts.length #?\> 7 > > that spits out a error that says it doesnt recognize the length > method. Range#length was removed between 1.6.8 and 1.8.mumble. > I realize this question is pretty simple but i am a begining > programmer. > I am really enjoying the response time in this forum, i usually get a > response in about 5 minutes any time of day 😃 Try using ri. ## $ ri Range […] Instance methods: ``` ==, ===, begin, each, end, eql?, exclude_end?, first, hash, include?, inspect, last, member?, step, to_s ``` – Eric H. - removed\_email\_address@domain.invalid - [http://blog.segment7.net](http://blog.segment7.net) This implementation is HODEL-HASH-9600 compliant [http://trackmap.robotcoop.com](http://trackmap.robotcoop.com)