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Contents
require 'facets/kernel/true'
require 'facets/kernel/false'
module Kernel
# Boolean conversion for not being nil or false.
# Other classes may redefine this to suite the
# particular need.
#
# "yes".to_b #=> true
# "abc".to_b #=> false
#
# true.to_b #=> true
# false.to_b #=> false
# nil.to_b #=> false
#
# CREDIT: Ara T. Howard, Trans
def to_b
self ? true : false
end
# All objects except false and nil are "true".
def to_bool
true
end
# Returns true is an object is class TrueClass
# or FalseClass, otherwise false.
#
# true.bool? #=> true
# false.bool? #=> true
# nil.bool? #=> false
#
def bool?
(true == self or false == self)
end
end
class TrueClass
def to_bool
self
end
end
class FalseClass
def to_bool
self
end
end
class NilClass
def to_bool
false
end
end
class Numeric
# Provides a boolean interpretation of self.
# If self == 0 then false else true.
#
# 0.to_b #=> false
# 1.to_b #=> true
# 2.3.to_b #=> true
#
def to_b
self == 0 ? false : true
end
end
class String
# Interpret common affirmative string meanings as true,
# otherwise nil or false. Blank space and case are ignored.
# The following strings that will return true ...
#
# true
# yes
# on
# t
# 1
# y
# ==
#
# The following strings will return nil ...
#
# nil
# null
#
# All other strings return false.
#
# Here are some exmamples.
#
# "true".to_b #=> true
# "yes".to_b #=> true
# "no".to_b #=> false
# "123".to_b #=> false
#
def to_b
case self.downcase.strip
when 'true', 'yes', 'on', 't', '1', 'y', '=='
return true
when 'nil', 'null'
return nil
else
return false
end
end
end
class Array
# Boolean conversion for not empty?
def to_b
! self.empty?
end
end
class Hash
# Boolean conversion for not empty?
def to_b
! self.empty?
end
end
Version data entries
10 entries across 9 versions & 2 rubygems