Seven Languages in Seven Weeks - Ruby Day 1 Day 2

day1.rb

#day1 questions

puts "Hello, world"
puts "Hello, Ruby".index("Ruby")

x=0
while x < 10
	puts "Chapman"
	x = x + 1
end

def guess_rank
	x=rand(10)
	print "Guess number between 0-9: "
	guess = x+1
	while x!=guess
		guess = gets.to_i
		puts "lower" if x<guess
		puts "higher" if x>guess
		puts "correct" if x==guess
	end
end

guess_rank

day2.rb

array = [*(1..16)]

#print the arrays 4 at a time
#array.each {|num| 4.times{puts num}}
array.each {|num| puts array[((num-4)..num)] if num % 4 ==0}

array.each_slice(4) {|num| puts num}

class Tree 
  attr_accessor :children, :node_name
  
	def initialize(name,children = [])
		#make it accept hash keys use .respond_to?('keys') 
		#to check for this 
		
		if name.respond_to?('keys') then
			#get first layer of the list
			root_node = name.first
			name = root_node[0]
			children = root_node[1]
		end
		
		#subsequent layers
		if children.respond_to?('keys') then 
			children = children.map {|child,grandchildren| Tree.new(child,grandchildren)}
		end
	
		@children = children
		@node_name = name
	end
	
	def visit_all(&block)
		visit &block
		children.each {|c| c.visit_all &block}
	end
	
	def visit(&block)
		block.call self
	end
end

#have a sample text
files = File.open('text.txt','w+')

files.puts "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
files.puts "Maecenas viverra condimentum augue a pulvinar. "
files.puts "Etiam vitae nibh nibh, ut dignissim ligula. "
files.puts "Morbi vehicula tellus eu nunc consequat gravida. "
files.puts "Proin mattis velit sit amet metus dapibus venenatis. "
files.puts "Nunc auctor vulputate justo, imperdiet euismod urna pharetra vitae. "
files.puts "Aenean feugiat eleifend purus eget fermentum. "
files.puts "Donec fringilla imperdiet turpis non feugiat. "

files.close

#to use grep to find the text, use the perl like syntax =~ 

def grepping(pattern)
	File.open('text.txt','r').each {|line| puts "#{line}" if Regexp.new(pattern) =~ line }
end

grepping('vitae')