New methods introduced in ruby 2.5

Ruby 2.5

Released on 25 Dec 2017. A lot of improvements were introduced in this release. New methods were part of this improvements.

Arry#prepend

array = [1, 2]
array.prepend(3, 4)
array #=> [3, 4, 1, 2]

Array#append

array = [1, 2]
array.append(3, 4)
array #=> [1, 2, 3, 4]

Hash#transform_keys/transform_keys!

hash = {a: 1, b: 2}
hash.transform_keys(&:to_s) => {'a' => 1, 'b' => 2}
hash.transform_keys!(&:to_s)
{'a' => 1, 'b' => 2}

String#delete_prefix/delete_suffix

'invisible'.delete_prefix('in') #=> "visible"
'pink'.delete_prefix('in') #=> "pink"
 
'worked'.delete_suffix('ed') #=> "work"
'medical'.delete_suffix('ed') #=> "medical"

rescue/else/ensure are allowed inside do/end blocks without begin/end

[1].each do |n|
  n / 0
rescue
  # rescue
else
  # else
ensure
  # ensure
end

Dir.children - It provides the result with [’.’, ‘..’]

Dir.children('./test/dir_a')
#=> ['code_a.rb', 'text_a.txt']

Dir.each_child returns not an array but an Enumerator object

Dir.each_child('./test/dir_a')
#=> #<Enumerator: Dir:each_child(\"./test/dir_a\")>"
 
Dir.each_child('./test/dir_a').to_a
#=> ['code_a.rb', 'text_a.txt']

Thanks for reading!!!