Created
March 16, 2011 15:17
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in 1.9.2 do ... end blocks return an enumerator, in 1.8.7 nil, but return the same as {} if assigned to a var. why?
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| puts [1,2,3].map {|x|x+1}.inspect | |
| #[2, 3, 4] | |
| puts [1,2,3].map do |x|x+1 end.inspect | |
| #<Enumerator:0x00000100868110> |
only jruby seems to be returning the correct result
x = {}.tap do |hsh|
hsh[:foo] = :bar
end
puts x.inspect
{:foo=>:bar}
puts {}.tap do |hsh|
hsh[:foo] = :bar
end.inspect
NoMethodError: undefined method `[]=' for nil:NilClass
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a = [1,2,3].map do |x|x+1 end.inspect
puts a
[2, 3, 4]