Module: PrimeNumberTable

Extended by:
PrimeNumberTable
Included in:
PrimeNumberTable
Defined in:
lib/prime_number_table.rb,
lib/prime_number_table/version.rb

Constant Summary collapse

VERSION = 
'2.2'

Instance Method Summary collapse

Instance Method Details

#dialog ⇒ Object 



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# File 'lib/prime_number_table.rb', line 8

def dialog
  width, height = loop do
    printf "=> Please give matrix dimension (<width>x<height>)\n-> "
    dimension = gets.delete(' ').downcase
    break dimension if /^\d+x\d+$/ =~ dimension
  end.split('x').map(&:to_i)

  numbers = begin
    printf "=> Should I use (P)rime numbers or (F)ibonacci numbers?\n-> "
    input = gets.strip.downcase
    { p: :prime, f: :fibonacci }.fetch(input.to_sym, input).tap(&method(:validate_numbers!))
  rescue ArgumentError
    retry
  end

  operation = begin
    printf "=> Multiplication (*) or Addition (+)\n-> "
    input = gets.strip.downcase
    { m: :multiplication, a: :addition }.fetch(input.to_sym, input).tap(&method(:validate_operation!))
  rescue ArgumentError
    retry
  end

  puts
  print(width: width, height: height, numbers: numbers, operation: operation)
  puts
end

#fibonacci_number(index) ⇒ Object 



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# File 'lib/prime_number_table.rb', line 55

def fibonacci_number(index)
  @fibonacci_numbers ||= Hash.new { |hash, key| hash[key] = key < 2 ? key : hash[key - 1] + hash[key - 2] }
  @fibonacci_numbers[index]
end

#prime?(number) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prime_number_table.rb', line 66

def prime?(number)
  return false if number < 2

  @prime_numbers ||= []
  @prime_numbers[number] = (2..number / 2).none? { |i| (number % i).zero? } if @prime_numbers[number].nil?
  @prime_numbers[number]
end

#prime_number(index) ⇒ Object 



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# File 'lib/prime_number_table.rb', line 60

def prime_number(index)
  number = 0
  (index -= 1 if prime?(number += 1)) while index.positive?
  number
end

#print(table_size: nil, width: 3, height: 3, numbers: :prime, operation: :addition) ⇒ Object 



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# File 'lib/prime_number_table.rb', line 36

def print(table_size: nil, width: 3, height: 3, numbers: :prime, operation: :addition)
  validate_numbers!(numbers)
  validate_operation!(operation)

  operation = { addition: :+, multiplication: :* }.fetch(operation.to_sym, operation)

  (1..table_size || height).each do |row|
    (1..table_size || width).each do |column|
      y = public_send("#{numbers}_number", row)
      x = public_send("#{numbers}_number", column)
      printf('%3d ', x.public_send(operation, y))
    end

    puts
  end

  nil
end