Ruby 2.3 what’s new?Jędrzej Wiśniewski

Frozen String Literals

Safe navigation operator

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Hash comparison

Same keys and content

Same keys different content

Same content different keys

Hash containing different one (with same values)

Hash containing different one (with different values)

Number #negative? #positive?

Hash #dig and Array #dig

Hash #to_proc

Hash #fetch values

Enumerable #grep_v

Source: http://dev.mensfeld.pl/2015/11/ruby-2-3-0-changes-and-features/