# Feature of recursive Array#join

**URL:** <https://www.ruby-forum.com/t/feature-of-recursive-array-join/152355>\
**Category:** Development\
**Created:** [November 3, 2008, 4:12am UTC](https://www.ruby-forum.com/t/feature-of-recursive-array-join/152355 "2008-11-03T04:12:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Yugui\_SYuki\_S.S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/dec6dc/32.png) [@Yugui\_SYuki\_S.S](https://www.ruby-forum.com/u/Yugui_SYuki_S.S)\
**Post date:** [November 3, 2008, 4:12am UTC](https://www.ruby-forum.com/t/feature-of-recursive-array-join/152355/1 "2008-11-03T04:12:22Z")

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% cat test.rb  
x = [[1,2],[3,4]]  
x \<\< x  
puts x.inspect  
puts x.join(’:’)

% ruby -v test.rb  
ruby 1.8.7 (2008-08-11 patchlevel 72)  
[i686-darwin9]  
[[1, 2], [3, 4], […]]  
1:2:3:4:1:2:3:4:[…]

% ruby-1.9.1 -v test.rb  
ruby 1.9.1 (2008-10-31)  
[i386-darwin9.5.0]  
[[1, 2], [3, 4], […]]  
1:2:3:4:[…]:[…]:[…]

---

<div class="post-metadata">

**Author:** ![Yugui\_SYuki\_S.S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/dec6dc/32.png) [@Yugui\_SYuki\_S.S](https://www.ruby-forum.com/u/Yugui_SYuki_S.S)\
**Post date:** [November 3, 2008, 3:40pm UTC](https://www.ruby-forum.com/t/feature-of-recursive-array-join/152355/2 "2008-11-03T15:40:52Z")

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In message “Re: [ruby-dev:37019] feature of recursive Array#join”  
on Mon, 3 Nov 2008 12:10:17 +0900, “Yugui (Yuki S.)”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

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