From: aycabta@... Date: 2017-12-01T22:34:03+00:00 Subject: [ruby-core:84045] [Ruby trunk Feature#12753] Useful operator to check bit-flag is true or false Issue #12753 has been updated by aycabta (ayca bta). phluid61 (Matthew Kerwin) wrote: > exist/exists is tense, bit/bits is plurality, so it is unrelated. Oh, thank you...I understand. ---------------------------------------- Feature #12753: Useful operator to check bit-flag is true or false https://bugs.ruby-lang.org/issues/12753#change-68132 * Author: tagomoris (Satoshi TAGOMORI) * Status: Assigned * Priority: Normal * Assignee: matz (Yukihiro Matsumoto) * Target version: 2.5 ---------------------------------------- Ruby's 0 is truthy value. It's useful for many cases, but it's confusing and I made many bugs when I'm writing code to handle binary data, because my thought is almost same with one to write C code in such situation. ```ruby n = get_integer_value if n & 0b10100000 # code for the case when flag is true else # never comes here :( end ``` IMO it's very useful to have methods for such use-cases, like `#and?` and `#xor?` (`#or?` looks not so useful... I can't imagine the use case of this operator, but it's better to have for consistency). ```ruby n = get_integer_value case when n.and?(0b10000000) # negative signed char when n.and?(0b01110000) # large positive else # small positive end ``` -- https://bugs.ruby-lang.org/ Unsubscribe: