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# Enumerable extensions.
module Enumerable
# Invokes the specified method for each item, along with the supplied
# arguments.
def send_each(sym, *args)
each {|i| i.send(sym, *args)}
end
end
# Range extensions
class Range
# Returns the interval between the beginning and end of the range.
def interval
last - first
end
end
# Object extensions
class Object
# Returns true if the object is a object of one of the classes
def is_one_of?(*classes)
classes.each {|c| return c if is_a?(c)}
nil
end
# Objects are blank if they respond true to empty?
def blank?
nil? || (respond_to?(:empty?) && empty?)
end
end
class Numeric
# Numerics are never blank (not even 0)
def blank?
false
end
end
class NilClass
# nil is always blank
def blank?
true
end
end
class TrueClass
# true is never blank
def blank?
false
end
end
class FalseClass
# false is always blank
def blank?
true
end
end
class String
BLANK_STRING_REGEXP = /\A\s*\z/
# Strings are blank if they are empty or include only whitespace
def blank?
empty? || BLANK_STRING_REGEXP.match(self)
end
end
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