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Contents
class Object
# An object is blank if it's false, empty, or a whitespace string.
# For example, +false+, '', ' ', +nil+, [], and {} are all blank.
def blank?
respond_to?(:empty?) ? !!empty? : !self
end
# An object is present if it's not blank.
def present?
!blank?
end
# Returns the receiver if it's present otherwise returns +nil+.
def presence
self if present?
end
end
class NilClass
# +nil+ is blank
def blank?
true
end
end
class FalseClass
# +false+ is blank
def blank?
true
end
end
class TrueClass
# +true+ is not blank
def blank?
false
end
end
class Array
# An array is blank if it's empty
alias blank? empty?
end
class Hash
# A hash is blank if it's empty
alias blank? empty?
end
class String
BLANK_RE = /\A[[:space:]]*\z/
# A string is blank if it's empty or contains whitespaces only:
#
# ''.blank? # => true
# ' '.blank? # => true
# "\t\n\r".blank? # => true
# ' blah '.blank? # => false
#
# Unicode whitespace is supported:
#
# "\u00a0".blank? # => true
#
# @return [true, false]
def blank?
# The regexp that matches blank strings is expensive. For the case of empty
# strings we can speed up this method (~3.5x) with an empty? call. The
# penalty for the rest of strings is marginal.
empty? || BLANK_RE.match?(self)
end
end
class Numeric
# No number is blank
def blank?
false
end
end
class Time
# No Time is blank
def blank?
false
end
end
Version data entries
7 entries across 7 versions & 1 rubygems