Ruby/Number/Fixnum class
Материал из Wiki.crossplatform.ru
Содержание |
Extend the Fixnum class with some helper methods to make manipulating dates easier
class Fixnum def seconds self end def minutes self * 60 end def hours self * 60 * 60 end def days self * 60 * 60 * 24 end end puts Time.now puts Time.now + 10.minutes puts Time.now + 16.hours puts Time.now - 7.days
find out the ancestors of Fixnum
p Fixnum.ancestors # => [Fixnum, Integer, Precision, Numeric, Comparable, Object, Kernel]
Fixnum literal value
123456 => 123456 # Fixnum 0d123456 => 123456 # Fixnum 123_456 => 123456 # Fixnum - underscore ignored -543 => -543 # Fixnum - negative number 0xaabb => 43707 # Fixnum - hexadecimal 0377 => 255 # Fixnum - octal -0b10_1010 => -42 # Fixnum - binary (negated) 123_456_789_123_456_789 => 123456789123456789 # Bignum
Normal-looking math equations when you use operator methods, such as +
Each line that follows is actually a valid call to the Fixnum + method 10 + 2 # => 12 10.+ 2 # => 12 (10).+(2) # => 12
Output the modules where Fixnum lives
p Fixnum.included_modules # => [Precision, Comparable, Kernel]
Raise ArgumentError from method
def Fixnum.random(min, max) raise ArgumentError, "min > max" if min > max return min + rand(max-min+1) end Fixnum.random(10, 20) # => 13 Fixnum.random(-5, 0) # => -5 Fixnum.random(10, 10) # => 10 Fixnum.random(20, 10) # ArgumentError: min > max
