CSV::Row#each etc. return enumerator when no block given

In Ruby 2.3, These methods do not return enumerator when no block is given.

Ruby 2.3

1
2CSV::Row.new(%w(banana mango), [1,2]).each #=> #<CSV::Row "banana":1 "mango":2>
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4CSV::Row.new(%w(banana mango), [1,2]).delete_if #=> #<CSV::Row "banana":1 "mango":2>
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Some methods raise exception because of this behavior.

1
2> ruby -rcsv -e 'CSV::Table.new([CSV::Row.new(%w{banana mango}, [1, 2])]).by_col.each'
3 #=> /Users/sushant/.rbenv/versions/2.3.0/lib/ruby/2.3.0/csv.rb:850:in `block in each': undefined method `[]' for nil:NilClass (NoMethodError)
4  from /Users/sushant/.rbenv/versions/2.3.0/lib/ruby/2.3.0/csv.rb:850:in `each'
5  from /Users/sushant/.rbenv/versions/2.3.0/lib/ruby/2.3.0/csv.rb:850:in `each'
6  from -e:1:in `<main>'
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Ruby 2.4 fixed this issue.

Ruby 2.4

1
2CSV::Row.new(%w(banana mango), [1,2]).each #=> #<Enumerator: #<CSV::Row "banana":1 "mango":2>:each>
3
4CSV::Row.new(%w(banana mango), [1,2]).delete_if #=> #<Enumerator: #<CSV::Row "banana":1 "mango":2>:delete_if>
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As we can see, these methods now return an enumerator when no block is given.

In Ruby 2.4 following code will not raise any exception.

1
2> ruby -rcsv -e 'CSV::Table.new([CSV::Row.new(%w{banana mango}, [1, 2])]).by_col.each'
3
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