Converting string from snake_case to CamelCase in Ruby

Question

I am trying to convert a name from snake case to camel case. Are there any built-in methods?

Eg: \"app_user\" to \"AppUser\"

(I hav

Answer 1

Source: http://rubydoc.info/gems/extlib/0.9.15/String#camel_case-instance_method

For learning purpose:

class String
  def camel_case
    return self if self !~ /_/ && self =~ /[A-Z]+.*/
    split('_').map{|e| e.capitalize}.join
  end
end

"foo_bar".camel_case          #=> "FooBar"

And for the lowerCase variant:

class String
  def camel_case_lower
    self.split('_').inject([]){ |buffer,e| buffer.push(buffer.empty? ? e : e.capitalize) }.join
  end
end

"foo_bar".camel_case_lower          #=> "fooBar"