From: "andrykonchin (Andrew Konchin) via ruby-core" Date: 2023-04-13T11:06:41+00:00 Subject: [ruby-core:113221] [Ruby master Misc#19597] Process.argv0 returns the same mutable String Issue #19597 has been reported by andrykonchin (Andrew Konchin). ---------------------------------------- Misc #19597: Process.argv0 returns the same mutable String https://bugs.ruby-lang.org/issues/19597 * Author: andrykonchin (Andrew Konchin) * Status: Open * Priority: Normal ---------------------------------------- `Process.argv0` returns a name of the script being executed. But it seems it's always the same object, that can be modified and this change will be visible to the consequent `Process.argv0` calls. It makes sense to return a frozen String that cannot be modified. `$0` initial value equals a value returned by `Process.argv0` so `$0` by default also could be a frozen String. Example: ```ruby puts "Object id:" p Process.argv0.object_id p Process.argv0.object_id puts "Value before modification:" p Process.argv0 Process.argv0.upcase! puts "Value after modification:" p Process.argv0 ``` It will output: ``` Object id: 60 60 Value before modification: "argv0.rb" Value after modification: "ARGV0.RB" ``` -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/