module NaturalNumberString

Check the value is string of positive integer

@example Use include

class Example
  include NaturalNumberString
  def example
    positive_integer_string?('1') #=> true
    positive_integer_string?('100000000000000') #=> true

    positive_integer_string?(nil) #=> false
    positive_integer_string?('') #=> false
    positive_integer_string?(1) #=> false
    positive_integer_string?('1.1') #=> false
    positive_integer_string?('-1') #=> false
    positive_integer_string?('0') #=> false
  end
end

@example Use direct

NaturalNumberString.positive_integer_string?('1') #=> true
NaturalNumberString.positive_integer_string?('100000000000') #=> true

NaturalNumberString.positive_integer_string?(nil) #=> false
NaturalNumberString.positive_integer_string?('') #=> false
NaturalNumberString.positive_integer_string?(1) #=> false
NaturalNumberString.positive_integer_string?('1.1') #=> false
NaturalNumberString.positive_integer_string?('-1') #=> false
NaturalNumberString.positive_integer_string?('0') #=> false

@param value [Object] any object @return [Boolean] the value is string of positive integer

# File lib/natural_number_string.rb, line 74
def positive_integer_string?(value)
  value.is_a?(String) && /^[1-9]\d*$/ =~ value ? true : false
end

Check the value is string of positive integer or zero

@example Use include

class Example
  include NaturalNumberString
  def example
    zero_or_positive_integer_string?('1') #=> true
    zero_or_positive_integer_string?('100000000000000') #=> true
    zero_or_positive_integer_string?('0') #=> true

    zero_or_positive_integer_string?(nil) #=> false
    zero_or_positive_integer_string?('') #=> false
    zero_or_positive_integer_string?(1) #=> false
    zero_or_positive_integer_string?('1.1') #=> false
    zero_or_positive_integer_string?('-1') #=> false
  end
end

@example Use direct

NaturalNumberString.zero_or_positive_integer_string?('1') #=> true
NaturalNumberString
  .zero_or_positive_integer_string?('100000000000') #=> true
NaturalNumberString.zero_or_positive_integer_string?('0') #=> true

NaturalNumberString.zero_or_positive_integer_string?(nil) #=> false
NaturalNumberString.zero_or_positive_integer_string?('') #=> false
NaturalNumberString.zero_or_positive_integer_string?(1) #=> false
NaturalNumberString.zero_or_positive_integer_string?('1.1') #=> false
NaturalNumberString.zero_or_positive_integer_string?('-1') #=> false

@param value [Object] any object @return [Boolean] the value is string of positive integer or zero

# File lib/natural_number_string.rb, line 39
def zero_or_positive_integer_string?(value)
  value.is_a?(String) && /^\d+$/ =~ value ? true : false
end