[ruby-core:75346] [Ruby trunk Feature#12347] [PATCH] Make CSV::Row#each etc. return Enumerator when no block given

Issue #12347 has been reported by Kazuki Tsujimoto.

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Feature #12347: [PATCH] Make CSV::Row#each etc. return Enumerator when no block given
https://bugs.ruby-lang.org/issues/12347

* Author: Kazuki Tsujimoto
* Status: Open
* Priority: Normal
* Assignee: 
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I propose to make following methods return Enumerator when no block given.

* CSV::Row#each
* CSV::Row#delete_if
* CSV::Table#each
* CSV::Table#delete_if

I think that the behavior without block is undefined (and several methods raise error in such a case as follows),
so it will not break compatibility.

~~~
$ ruby -rcsv -e 'CSV::Table.new([CSV::Row.new(%w{A}, [1])]).by_col.each'
/usr/local/ruby-2.3/lib/ruby/2.3.0/csv.rb:850:in `block in each': undefined method `[]' for nil:NilClass (NoMethodError)
        from /usr/local/ruby-2.3/lib/ruby/2.3.0/csv.rb:850:in `each'
        from /usr/local/ruby-2.3/lib/ruby/2.3.0/csv.rb:850:in `each'
        from -e:1:in `<main>'
~~~


---Files--------------------------------
0001-lib-csv.rb-CSV-Row-Table-each-delete_if-Returns-an-e.patch (5.78 KB)


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