Lesson 1.6: Differences Between Ruby Versions

Question 1

Deprecated technologies

Answer 1

…are technologies which have been replaced by newer technologies. Features typically get marked as “deprecated”, rather than simply removed, in order to provide backward compatibility for software users.

Question 2

String#each

Answer 2

If you look at the Ruby 1.8.7 documentation you can still see an explanation of this method. In Ruby 1.9.0, String#each was deprecated. Thus, we can no longer use this method with later versions.

Question 3

Array#to_h

Answer 3

to_h –> hash # to h returns a hash
to_h { block } –> hash #returns the result of interpreting ary as an array of key-value pairs.

If you look at the Ruby 2.0.0 documentation for Array, you won’t find #to_h in the list of methods, but in the Ruby 2.1.0 documentation, it is listed.