small_puzzles.rb

puzzles.rb

digit = 543210

# Reverse digit
def reverse_digit(digit)
	str = digit.to_s.reverse.split('')
	if str.first == '0'
		str.shift
	end
	str.join('').to_i
end

puts reverse_digit(543210)
# Output => 12345


# Math method reverse digit
def reverse_math_digit(digit)
	reverse = 0
  while digit > 0
	  lastDigit = digit % 10
		reverse = (reverse * 10) + lastDigit
		digit = digit / 10
  end
	reverse
end

puts reverse_math_digit(digit)
# Output => 12345

# Find out if two words are anagram
def is_it_anagram(word_1, word_2)
	word_1 = word_1.split('')
	word_2 = word_2.split('')
	word_stat = Hash.new(0)

	word_1.each do |w|
		if word_stat.has_key?(w)
			word_stat[w] += 1
		else
			word_stat[w] = 1
		end
	end

	word_2.each do |w|
		if word_stat.has_key?(w)
			word_stat[w] += 1
		else
			word_stat[w] = 1
		end
	end

	is_anagram = true
	word_stat.each_value do |v|
		if v%2 != 0
			puts "It's a not anagram"
			is_anagram = false
			break
		end
	end
	is_anagram
end

puts is_it_anagram('start', 'ttars')
puts is_it_anagram('start', 'vasya')

# => true
# => It's a not anagram
# => false