viciousfish wrote in post #1016211: > Hello, > > I am noodling with the Ruby Koans and I ran across an Array slice > behavior that I just can't quite wrap my brain around: > > ruby-1.9.2-p180 :102 > array = [:peanut, :butter, :and, :jelly] > => [:peanut, :butter, :and, :jelly] > ruby-1.9.2-p180 :103 > array[4,0] > => [] > ruby-1.9.2-p180 :104 > array[5,0] > => nil > > from http://www.ruby-doc.org/core/classes/Array.html#M000267 > "Returns nil if the index (or starting index) are out of range." > > I don't understand why the 4th element is an empty array, whereas the > 5th element is out of range. I would expect the 4th element to be out > of range as 'array' contains elements 0-3. > > Can someone plz explain? >
Slices are different than single indexes: array[4, 0] and array[4] point to two different spots in the array, and the spot array[4,0] points to is just inbounds, while array[4] is out of bounds. See here: http://www.ruby-forum.com/topic/1393096 -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
