Question

I’m using Ruby 1.9.2. For example i’ve got class :

class Test
  def ==(param)
    # some process
  end

  def bar(param)
    puts "foo bar #{param}"
  end
end

I can invoke bar method using :

Test.new.instance_eval{ bar 'celona' }

But i cannot execute == method from block like

Test.new.instance_eval{ == "foo" }

i’ve got syntax error, unexpected tEQ

Answer 1

The following worked for me:

class Test
  def ==(param)
    p "You put #{param}"
  end
end

Test.new.instance_eval{|a|  a == "foo" }
=> "You put foo"

The solution really depends on your use case.

Edit The same holds true for when you instantiate a class.

b = Test.new
b == "foo"
=> "You put foo"

You can also use self

Test.new.instance_eval{self == "foo" }

I am not entirely sure of the reason, but I would guess that the == method required an explicit callee and it can’t infer self