class Integer

Enables the use of time calculations and declarations, like 45.minutes + 2.hours + 4.years.

These methods use Time#advance for precise date calculations when using from_now, ago, etc. as well as adding or subtracting their results from a Time object.

# equivalent to Time.now.advance(months: 1)
1.month.from_now

# equivalent to Time.now.advance(years: 2)
2.years.from_now

# equivalent to Time.now.advance(months: 4, years: 5)
(4.months + 5.years).from_now

While these methods provide precise calculation when used as in the examples above, care should be taken to note that this is not true if the result of months, years, etc is converted before use:

# equivalent to 30.days.to_i.from_now
1.month.to_i.from_now

# equivalent to 365.25.days.to_f.from_now
1.year.to_f.from_now

In such cases, Ruby's core Date and Time should be used for precision date and time arithmetic.

# File activesupport/lib/active_support/core_ext/integer/time.rb, line 35
def months
  ActiveSupport::Duration.new(self * 30.days, [[:months, self]])
end

Check whether the integer is evenly divisible by the argument.

0.multiple_of?(0)  # => true
6.multiple_of?(5)  # => false
10.multiple_of?(2) # => true

# File activesupport/lib/active_support/core_ext/integer/multiple.rb, line 7
def multiple_of?(number)
  number != 0 ? self % number == 0 : zero?
end

Ordinal returns the suffix used to denote the position in an ordered sequence such as 1st, 2nd, 3rd, 4th.

1.ordinal     # => "st"
2.ordinal     # => "nd"
1002.ordinal  # => "nd"
1003.ordinal  # => "rd"
-11.ordinal   # => "th"
-1001.ordinal # => "st"

# File activesupport/lib/active_support/core_ext/integer/inflections.rb, line 26
def ordinal
  ActiveSupport::Inflector.ordinal(self)
end

Ordinalize turns a number into an ordinal string used to denote the position in an ordered sequence such as 1st, 2nd, 3rd, 4th.

1.ordinalize     # => "1st"
2.ordinalize     # => "2nd"
1002.ordinalize  # => "1002nd"
1003.ordinalize  # => "1003rd"
-11.ordinalize   # => "-11th"
-1001.ordinalize # => "-1001st"

# File activesupport/lib/active_support/core_ext/integer/inflections.rb, line 13
def ordinalize
  ActiveSupport::Inflector.ordinalize(self)
end