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

Extend String to Add Camelize

In pure Ruby you could extend the string class using the exact same code from Rails .camelize

class String
  def camelize(uppercase_first_letter = true)
    string = self
    if uppercase_first_letter
      string = string.sub(/^[a-z\d]*/) { |match| match.capitalize }
    else
      string = string.sub(/^(?:(?=\b|[A-Z_])|\w)/) { |match| match.downcase }
    end
    string.gsub(/(?:_|(\/))([a-z\d]*)/) { "#{$1}#{$2.capitalize}" }.gsub("/", "::")
  end
end