From: fg@... Date: 2019-11-02T10:06:36+00:00 Subject: [ruby-core:95652] [Ruby master Feature#11660] a falsy value (similar to js undefined) that facilitates forwarding of default arguments Issue #11660 has been updated by decuplet (Nikita Shilnikov). For this purpose, I built a [special value](https://github.com/dry-rb/dry-core/blob/99e4035148af729298430aefe85b4c93cb318195/lib/dry/core/constants.rb#L41) a while ago. It has been working fine all this time. I don't think there's a need in adding such special-cased value to the language. It would only slightly improve the experience over a hand-crafted ten-lines-of-code solution. The whole story of passing arguments in Ruby is already complicated enough. ---------------------------------------- Feature #11660: a falsy value (similar to js undefined) that facilitates forwarding of default arguments https://bugs.ruby-lang.org/issues/11660#change-82440 * Author: bughit (bug hit) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- I'll call it "missing" here. Consider the following scenario: ```ruby def foo(default1 = some_expression) end def bar(default1 = some_expression) foo default1 end def foobar(default1 = some_expression) bar default1 end ``` if you had "missing": ```ruby def foo(default1 = some_expression) end def bar(default1 = missing) foo default1 end def foobar(default1 = missing) bar default1 end ``` missing passed as arg would be ignored (as if it wasn't passed at all) and you wouldn't have to repeat the default value expression in every method I believe that's how undefined works in js6 with respect to default args -- https://bugs.ruby-lang.org/ Unsubscribe: