Ruby in a Nutshell

Name

Numeric — Superclass of all concrete numbers

Synopsis

Numeric provides common behavior of numbers. Numeric is an abstract class, so you should not instantiate this class.

Included Module

Comparable

Instance Methods

+n

Returns n.

-n

Returns n negated.

n + num

n - num

n * num

n / num

Performs arithmetic operations: addition, subtraction, multiplication, and division.

n % num

Returns the modulus of n.

n ** num

Exponentiation.

n.abs

Returns the absolute value of n.

n.ceil

Returns the smallest integer greater than or equal to n.

n.coerce(num)

Returns an array containing num and n both possibly converted to a type that allows them to be operated on mutually. Used in automatic type conversion in numeric operators.

n.divmod(num)

Returns an array containing the quotient and modulus from dividing n by num.

n.floor

Returns the largest integer less than or equal to n.

1.2.floor            #=> 1
2.1.floor            #=> 2
(-1.2).floor         #=> -2
(-2.1).floor         #=> -3

n.integer?

Returns true if n is an integer.

n.modulo(num)

Returns the modulus obtained by dividing n by num and rounding the quotient with floor. Equivalent to n.divmod(num)[1].

n.nonzero?

Returns n if it isn’t zero, otherwise nil.

n.remainder(num)

Returns the remainder obtained by dividing n by num and removing decimals from the quotient. The result and n always have same sign.

(13.modulo(4))         #=>  1
(13.modulo(-4))        #=> -3
((-13).modulo(4))      #=>  3
((-13).modulo(-4))     #=> -1

(13.remainder(4))      #=>  1
(13.remainder(-4))     #=>  1
((-13).remainder(4))   #=> -1
(-13).remainder(-4))   #=> -1