Converting a ruby method from method() to ().method

Question

I'm very new to programming so I'm sorry if I'm asking a really simple question. I've also already done my research and I still can't get what I want so I'm asking here.

So I'm writing a simple camelcase method - All words must have their first letter capitalized without spaces. Right now in order to call this function I have to type camelcase("hello there") which would return "Hello There" in interactive ruby. I am wondering how to convert this method into a different type of method(I think it's called a class method?) which would allow me to do this instead: "hello there".camelcase #=> "Hello There"

I've also seen that the syntax would be like so:

class String
  def method()
  ...
  end
end

But I really don't know how to apply it...

def camelcase(string)
  newArray = []
  newNewArray = []
  array = string.split(" ")
  for i in 0...array.length
    newArray << array[i].capitalize
  end
  newNewArray = newArray.join(" ")
end

Answer 1

In this way. I've used your_camelcase because I'm not sure if that method does not exist in Ruby String class. Anyway, this is an instance method and you should use self to refer to your string

class String
  def your_camelcase
    newArray = []
    newNewArray = []
    array = self.split(" ")
    for i in 0...array.length
      newArray << array[i].capitalize
    end
    newArray.join(" ")
  end
end

Answer 2

You're almost there. Just put that method into String class. Inside of that method, self will refer to the string. You don't need to (and can't) pass it as a parameter.

class String
  def camelcase
    newArray = []
    newNewArray = []
    array = self.split(" ")
    for i in 0...array.length
      newArray << array[i].capitalize
    end
    newNewArray = newArray.join(" ")
  end
end

'hello there'.camelcase # => "Hello There"