Feature #9319: Add constant RUBY_KEYWORDS or a similar way to output which keywords exist at runtime

• Status: Closed
• Assignee: zzak (zzak _)
• Target version: 2.2.0

[shevegen (Robert A. Heiler)]

Hi,

Would it be possible to list all keywords in Ruby, from within a running program?

Like RUBY_KEYWORDS or similar?

Reasoning: On IRB someone asked me if "in" is a keyword. I was not sure so I googled
because I could not remember right off the head (I later remembered that "in" must
be because it is used in a "for" loop).

It would be nice if we could ask ruby itself which keywords would be available,
i.e. stored in an array.

http://ruby-doc.org/docs/keywords/1.9/ has a nice description of all keywords
too, which is great.

[shevegen (Robert A. Heiler)]

Oops, I meant "IRC", not "IRB", but yeah from within running IRB it would be also nice of course. :)

[zzak (zzak _)]

Thanks for the report, I can put something together for this soon

[zzak (zzak _)]

• Category set to doc
• Status changed from Open to Assigned
• Assignee set to zzak (zzak _)
• Priority changed from 3 to Normal

[zzak (zzak _)]

I created the following file, but I'm not sure if we should add anything else. https://gist.github.com/zzak/8187842

The old 1.9 file which converted these keywords to methods and added expanded documentation for each one is nice. I'm not sure it helps us or won't just confuse people.

Basically I think we should just make this a file under ./doc and you can access it from irb or ri, as well as it being available in the api documentation.

[zzak (zzak _)]

• Status changed from Assigned to Closed

We've added an rdoc file to the source tree that lists the current keywords of ruby, you can access it a couple of ways, such as:

$ ri ruby:keywords

or from irb:

help "ruby:keywords"