Error in code

[hlogoma]

Hi,
I was trying out the beginning ruby 1 exercise and I got this eval for line 11 which reads:

11:in 'is_a?': wrong number of arguments(0 for 1)

following is the code I copied to ruby console:

` model = Sketchup.active_model
entities = model.active_entities
selection = model.selection

edges = []
faces = []
comps = []
groups = []

entities.each do |e|
edges.push e if e.is_a? == "Edge"
faces.push e if e.is_a? == "Face"
comps.push e if e.is_a? == "ComponentInstance"
groups.push e if e.is_a? == "Group"
end

puts "Total Edges : " + edges.length.to_s
puts "Total Faces : " + faces.length.to_s
puts "Total Components : " + comps.length.to_s
puts "Total Groups : " + groups.length.to_s
puts "Total Entities : " + entities.length.to_s`

The model is a sphere called beginning ruby.

My question is "where is the error in the code?"

Thanks.

[thomthom]

.is_a? is a method, so you use it like this .is_a?(Sketchup::Edge)

[honoluludesktop]

I went here for methods, but couldn't find ".is_a", should I look elsewhere?

[thomthom]

.is_a? is a Ruby method - not a Sketchup method. http://ruby-doc.org/core/classes/Object.html#M000373

[Jim]

@honoluludesktop said:

I went here for methods, but couldn't find ".is_a", should I look elsewhere?

This is the more recent online API documentation:
http://code.google.com/apis/sketchup/docs/index.html

[honoluludesktop]

OK Thomas, Jim, thanks. Hmm... This will take more effort to learn then I thought:-) I won't even ask for a guess as to how long.

[Jim]

Get comfortable with Ruby, then apply that to the API documentation. Read other people's code, and most importantly - try things yourself, and ask questions when they don't work.