CheckIfDigitsEqualNumber.rb

# Description:

# A Narcissistic Number is a number which is the sum of its own digits, each raised to the power of the number of digits.

# For example, take 153 (3 digits):

#     1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153
# and 1634 (4 digits):

#     1^4 + 6^4 + 3^4 + 4^4 = 1 + 1296 + 81 + 256 = 1634
# The Challenge:

# Your code must return true or false depending upon whether the given number is a Narcissistic number.

# Error checking for text strings or other invalid inputs is not required, only valid integers will be passed.


# My answer: 
def narcissistic?( value )
   digits = value.to_s.length
   sum = 0
   value.to_s.chars.each {|x| sum = sum + (x.to_i ** digits)}
   sum == value ? true : false
end

# Test

puts narcissistic?( 5 )
puts "should return true"

puts narcissistic?( 153 )
puts "should return true"




# The best answer :
def narcissistic?( value )
  value == value.to_s.chars.map { |x| x.to_i**value.to_s.size }.reduce(:+)
end