Ruby 2.3.0 has been around since end of 2015. It brings some pretty nice new features! Make sure to read the linked post with its many examples!

Hash#fetch_values

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Similar to Hash#fetch, but for multiple values. Raises KeyError when a key is missing.

attrs = User.last.attributes
attrs.fetch_values :name, :email

Hash#to_proc

Turns a Hash into a Proc that returns the corresponding value when called with a key. May be useful with enumerators like #map:

attrs.to_proc.call(:name)
attrs.keys.grep(/name/).map &attrs

Hash comparison

Hashes can now be compared like numbers: <, >, <=, >=, which checks for (proper) subsets.

{a: 1} >= {a: 1} # => true
{a: 1} > {a: 1} # => false

Numeric predicates

Numeric#positive? and Numeric#negative? allow for easy filtering:

[1, -4, 2, -100].select &:positive? # => [1, 2]

Negative grep

Enumerable#grep_v excludes from the result set. It's similar to Rails' #reject:

['foo', 1, 'bar', {}].grep String # => ['foo', 'bar']
['foo', 1, 'bar', {}].grep_v String # => [1, {}]

Further, a safe navigation operator and Array#dig and Hash#dig!.