From: matz@... Date: 2018-07-18T06:24:55+00:00 Subject: [ruby-core:87980] [Ruby trunk Feature#12306] Implement String #blank? #present? and improve #strip and family to handle unicode Issue #12306 has been updated by matz (Yukihiro Matsumoto). If the requirement is adding a predicate method to check if a string contains only characters with space property (defined by Unicode), it's OK to add the method. I am not fully satisfied with the name `blank?` because it can cause confusion whether it checks a character in a string or all characters in a string. `blank?` is still acceptable though it's not the best. Regarding `present?`, I am not going to agree. Matz. ---------------------------------------- Feature #12306: Implement String #blank? #present? and improve #strip and family to handle unicode https://bugs.ruby-lang.org/issues/12306#change-72987 * Author: sam.saffron (Sam Saffron) * Status: Open * Priority: Normal * Assignee: matz (Yukihiro Matsumoto) * Target version: ---------------------------------------- Time and again there have been rejected feature requests to Ruby core to implement `blank` and `present` protocols across all objects as ActiveSupport does. I am fine with this call and think it is fair. However, for the narrow case of String having `#blank?` and `#present?` makes sense. - Provides a natural extension over `#strip`, `#lstrip` and `#rstrip`. `(" ".strip.length == 0) == " ".blank?` - Plays nicely with ActiveSupport, providing an efficient implementation in Ruby core: see: https://github.com/SamSaffron/fast_blank, implementing blank efficiently requires a c extension. However, if this work is to be done, `#strip` and should probably start dealing with unicode blanks, eg: ``` irb(main):008:0> [0x3000].pack("U") => "���" irb(main):009:0> [0x3000].pack("U").strip.length => 1 ``` So there are 2 questions / feature requests here 1. Can we add blank? and present? to String? 2. Can we amend strip and family to account for unicode per: https://github.com/SamSaffron/fast_blank/blob/master/ext/fast_blank/fast_blank.c#L43-L74 -- https://bugs.ruby-lang.org/ Unsubscribe: