From: daniel@...42.com Date: 2020-09-03T03:03:28+00:00 Subject: [ruby-core:99861] [Ruby master Feature#16994] Sets: shorthand for frozen sets of symbols / strings Issue #16994 has been updated by Dan0042 (Daniel DeLorme). I just thought of something... In the same way that `"str".freeze` is optimized to be deduplicated, `%w[a b].include?(obj)` could be optimized so it becomes equivalent to `obj == -"a" || obj == -"b"`, or something around those lines. This would have the advantage that all existing ruby code that uses this pattern would automatically become faster, without having to convert to a new literal syntax. ---------------------------------------- Feature #16994: Sets: shorthand for frozen sets of symbols / strings https://bugs.ruby-lang.org/issues/16994#change-87388 * Author: marcandre (Marc-Andre Lafortune) * Status: Open * Priority: Normal ---------------------------------------- I would like a shorthand syntax for *frozen Sets of symbols or of strings*. I am thinking of: ```ruby %ws{hello world} # => Set['hello', 'world'].freeze %is{hello world} # => Set[:hello, :world].freeze ``` The individual strings would be frozen. These literals would be created once at parse time (like Regex are): ```ruby def foo p %ws{hello world}.object_id end foo foo # => prints the same id twice ``` We should consider these sets to return a unique frozen `to_a`. Reminder: Ruby has literal notations for `Rational` and `Complex`. I've sadly never had to use either. I would venture to say that `Complex` is much less used than `Sets`, and that sets are underused. Reminder: previous discussion for builtin syntax was not for frozen literal, strings or symbols specifically: https://bugs.ruby-lang.org/issues/5478 For builtin notations for generic sets (i.e. *unfrozen* or containing *other than string/symbol*), please discuss in another issue. -- https://bugs.ruby-lang.org/ Unsubscribe: