class Integer

Public Instance Methods

each_digit() { |v| ... } click to toggle source

provide iterator for number's each digit

Example

ret=[];12345.each_digit { |v|ret << v+1 };print ret # => [2,3,4,5,6]
# File lib/open_classes/integer/each_digit.rb, line 10
def each_digit
  abs.to_s.split('').map(&:to_i).each { |v|yield(v) }
end
each_digit_with_index() { |v, i| ... } click to toggle source

provide iterator for number's each digit with index

Example

ret=[];12_345.each_digit_with_index { |v, i|ret << v + i };print ret # => [1, 3, 5, 7, 9]
# File lib/open_classes/integer/each_digit_with_index.rb, line 10
def each_digit_with_index
  abs.to_s.split('').map(&:to_i).each_with_index { |v, i|yield(v, i) }
end
palindromic_prime?() click to toggle source

Returns true if value is palindromic prime, false for a composite.

Example

0.palindromic_prime? # => false
1.palindromic_prime? # => false
2.palindromic_prime? # => true
11.palindromic_prime? # => true
757.palindromic_prime? # => true
758.palindromic_prime? # => false
# File lib/open_classes/integer/palindromic_prime.rb, line 16
def palindromic_prime?
  prime? && to_s == to_s.reverse
end
reverse_each_digit() { |v| ... } click to toggle source

provide reverse iterator for number's each digit

Example

ret=[];12345.reverse_each_digit { |v|ret << v+1 };print ret # => [6, 5, 4, 3, 2]
# File lib/open_classes/integer/reverse_each_digit.rb, line 10
def reverse_each_digit
  abs.to_s.split('').reverse.map(&:to_i).each { |v|yield(v) }
end