Bloc Web Development Loops Checkpoint

loops

### The Each Method ###

# Add a method named sum_numbers to the Array class.
# The method should sum all of the numbers in the Array that it's called on.

class Array
  def sum_numbers
    start=0
      self.each do |sum|
      start += sum
      end
      start
  end
end

# Add a method named camel_case to the String class. 
# The method should return a String with proper camel case conventions.

class String
  def camel_case
    camelCase = self.split
    camelCase.each do |word|
      word.capitalize!
    end
  camelCase.first.downcase!
  camelCase.join
  end
end

# Add a method named add_index to the Array class. 
# The method should take the index value of an element's position and add it to the String in the same position.

class Array
  def add_index
    addIndex = []
     self.each_with_index do |item, index|
      addIndex << "#{index} is #{item}"
      end
    addIndex
  end
end
  
  
  

### Title Case ###

#Create method to capitalize words except articles

class String
  def title_case
    articles = ["the", "of", "a", "and"]
    capital = []
      self.split.each_with_index do |word, index|
      if (articles.include?(word.downcase) && index != 0)
       capital << word.downcase
       else
       capital << word.capitalize
      end
  end
  capital.first.capitalize!
  capital.join(" ")
  end
end

notes: the difference between ! (bang methods) to the same method without a bang - is that the bang methods change the instance they are running on while the non-bang methods just return a value