include? - Returns true if a string is in another string.

Check if a string includes a specified character(s), case sensitive.

			
					'hello World'.include? hello.'

			
	

			
	
			

		
	

The Above Code returns

			
					true

			
	

			
	
			

		
	

• include? method is case sensetive.
• You may want to do a downcase() or upcase() before calling include?()
• str.upcase => Returns entire str lower cased. upcase! mutates.
• str.downcase => Returns entire str upper cased. downcase! mutates.

			
					if "abcd".include? "bc"
   puts "It includes 'bc'"
end

			
	

			
	
			

		
	

The Above Code returns

			
					It includes 'bc.'