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Add documentation about Array#join(nil). [Bug#5915]

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We talked about this and it is like following:
* maybe ary.join(nil) should always use empty string as a separator,
  but it disables to specify $, as a seprator through variables.
* if nil means '', the conversion is to_s. to_s is not accepted.
* nil is a special value, so special behavior is allowed.
* use of $ variables is not recommended, so it is not worth to change
  current behavior.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
naruse 2012-07-17 19:07:15 +00:00
parent 85dc1ab23b
commit ba2ed2edeb
1 changed files with 2 additions and 0 deletions
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array.c
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@ -1808,6 +1808,8 @@ rb_ary_join(VALUE ary, VALUE sep)
*
* Returns a string created by converting each element of the array to
* a string, separated by the given +separator+.
* If the +separator+ is +nil+, it uses current $,.
* If both the +separator+ and $, are nil, it uses empty string.
*
* [ "a", "b", "c" ].join #=> "abc"
* [ "a", "b", "c" ].join("-") #=> "a-b-c"