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class Object
# An object is blank if it's false, empty, or a whitespace string.
# For example, '', ' ', +nil+, [], and {} are all blank.
#
# This simplifies:
#
# if address.nil? || address.empty?
#
# ...to:
#
# if address.blank?
def blank?
respond_to?(:empty?) ? empty? : !self
end
# An object is present if it's not <tt>blank?</tt>.
def present?
!blank?
end
end
class NilClass
# +nil+ is blank:
#
# nil.blank? # => true
def blank?
true
end
end
class FalseClass
# +false+ is blank:
#
# false.blank? # => true
def blank?
true
end
end
class TrueClass
# +true+ is not blank:
#
# true.blank? # => false
def blank?
false
end
end
class Array
# An array is blank if it's empty:
#
# [].blank? # => true
# [1,2,3].blank? # => false
alias_method :blank?, :empty?
end
class Hash
# A hash is blank if it's empty:
#
# {}.blank? # => true
# { key: 'value' }.blank? # => false
alias_method :blank?, :empty?
end
class String
# A string is blank if it's empty or contains whitespaces only:
#
# ''.blank? # => true
# ' '.blank? # => true
# ' '.blank? # => true
# ' something here '.blank? # => false
def blank?
# self !~ /[^[:space:]]/
# TODO: Opal fails with the previous regex
self.strip == ''
end
end
class Numeric #:nodoc:
# No number is blank:
#
# 1.blank? # => false
# 0.blank? # => false
def blank?
false
end
end
Version data entries
93 entries across 93 versions & 1 rubygems