Issue #20041 has been updated by tenderlovemaking (Aaron Patterson). Assignee set to tenderlovemaking (Aaron Patterson) ---------------------------------------- Bug #20041: Array destructuring and default values in parameters https://bugs.ruby-lang.org/issues/20041#change-105543 * Author: tenderlovemaking (Aaron Patterson) * Status: Open * Priority: Normal * Assignee: tenderlovemaking (Aaron Patterson) * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- It's possible to set the default value of a parameter to a previous parameter. For example: ```ruby def foo(a, b = a) b end foo([1, 2]) # => [1, 2] ``` However, if the parameters are destructured, the destructring happens _after_ default parameter assignment. For example: ```ruby def foo((x, y), b = x) [x, y, b] end foo([1, 2]) # => [1, 2, nil] ``` Is this expected behavior? I would have expected the parameters to be "evaluated" from left to right, and the array destructuring to happen _before_ the default parameter assignment. Thanks! -- https://bugs.ruby-lang.org/