Methods/constants/classes available in context

ruby-talk
1

Jeff Davis wrote:

I am learning Ruby and one thing I sometimes find difficult is knowing
what methods, constants, and classes are available in a given context.

One example was I required a module, but I didn't know everything that
the module contained. Is there a way to know everything that you can
call in a given context? All the symbols that are available?

If you want to know what a unit contains, www.ruby-doc.org is a good
resource (or you can use ri, or line completion in irb). If you want
your *code* to know what's available, try these:

Object#instance_variables
Object#private_methods
Object#protected_methods
Object#public_methods
Object#singleton_methods
Module#constants
Module#instance_methods
Module#private_instance_methods
Module#protected_instance_methods
Module#public_instance_methods
Kernel#global_variables
Kernel#local_variables

See ruby-doc for details on their usage and other methods.

Regards,
   Jeff Davis

E

2

E S wrote:

Jeff Davis wrote:

I am learning Ruby and one thing I sometimes find difficult is knowing what methods, constants, and classes are available in a given context.

One example was I required a module, but I didn't know everything that the module contained. Is there a way to know everything that you can call in a given context? All the symbols that are available?
   
If you want to know what a unit contains, www.ruby-doc.org is a good resource (or you can use ri, or line completion in irb). If you want your *code* to know what's available, try these:

Object#instance_variables
Object#private_methods
Object#protected_methods
Object#public_methods
Object#singleton_methods
Module#constants
Module#instance_methods
Module#private_instance_methods
Module#protected_instance_methods
Module#public_instance_methods
Kernel#global_variables
Kernel#local_variables

Thanks, that's exactly what I was looking for. And thanks for the help on the other question also.

Regards, Jeff Davis

3

"Jeff Davis" <jdavis-list@empires.org> schrieb im Newsbeitrag news:41FC41A1.6060304@empires.org...

E S wrote:

Jeff Davis wrote:

I am learning Ruby and one thing I sometimes find difficult is knowing what methods, constants, and classes are available in a given context.

One example was I required a module, but I didn't know everything that the module contained. Is there a way to know everything that you can call in a given context? All the symbols that are available?

If you want to know what a unit contains, www.ruby-doc.org is a good resource (or you can use ri, or line completion in irb). If you want your *code* to know what's available, try these:

Object#instance_variables
Object#private_methods
Object#protected_methods
Object#public_methods
Object#singleton_methods
Module#constants
Module#instance_methods
Module#private_instance_methods
Module#protected_instance_methods
Module#public_instance_methods
Kernel#global_variables
Kernel#local_variables

Thanks, that's exactly what I was looking for. And thanks for the help on the other question also.

I use IRB a lot with this shell alias:
irb is aliased to `irb -r irb/completion'

That way you can hit tab with an instance and get all available methods:

$ irb
irb(main):001:0> a=%w{a bc d}
=> ["a", "bc", "d"]
irb(main):002:0> a.
Display all 107 possibilities? (y or n)
                         a.each_index a.indices a.nitems a.size
a.__id__ a.each_with_index a.inject a.object_id a.slice
a.__send__ a.empty? a.insert a.pack a.slice!
a.all? a.entries a.inspect a.partition a.sort
a.any? a.eql? a.instance_eval a.pop a.sort!
a.assoc a.equal? a.instance_of? a.private_methods a.sort_by
a.at a.extend a.instance_variable_get a.protected_methods a.taint
a.class a.fetch a.instance_variable_set a.public_methods a.tainted?
a.clear a.fill a.instance_variables a.push a.to_a
a.clone a.find a.is_a? a.rassoc a.to_ary
a.collect a.find_all a.join a.reject a.to_s
a.collect! a.first a.kind_of? a.reject! a.transpose
a.compact a.flatten a.last a.replace a.type
a.compact! a.flatten! a.length a.respond_to? a.uniq
a.concat a.freeze a.map a.reverse a.uniq!
a.delete a.frozen? a.map! a.reverse! a.unshift
a.delete_at a.grep a.max a.reverse_each a.untaint
a.delete_if a.hash a.member? a.rindex a.values_at
a.detect a.id a.method a.select a.zip
a.display a.include? a.methods a.send
a.dup a.index a.min a.shift
a.each a.indexes a.nil? a.singleton_methods
irb(main):002:0> a.

Kind regards

    robert

4

simply 'irb' offers tab completion by default with Ruby 1.8.2 (at least
on windows)