Sha256: 4a6c2d0283a96b3150fdde3852a8a9ea5aaeb437705cbfa1232a4844157bcac3
Contents?: true
Size: 1.45 KB
Versions: 10
Compression:
Stored size: 1.45 KB
Contents
module Kernel
# An object is blank if it's nil, empty, or a whitespace string.
# For example, "", " ", nil, [], and {} are blank.
#
# This simplifies...
#
# if !address.nil? && !address.empty?
#
# to...
#
# if !address.blank?
#
def blank?
return empty? if respond_to?(:empty?)
!self
end
# An object is present if it's not blank.
def present?
!blank?
end
# Returns object if it's #present? otherwise returns nil.
# object.presence is equivalent to object.present? ? object : nil.
#
# This is handy for any representation of objects where blank is the same
# as not present at all. For example, this simplifies a common check for
# HTTP POST/query parameters...
#
# state = params[:state] if params[:state].present?
# country = params[:country] if params[:country].present?
# region = state || country || 'US'
#
# becomes...
#
# region = params[:state].presence || params[:country].presence || 'US'
#
def presence
self if present?
end
end
class NilClass
def blank?
true
end
end
class FalseClass
def blank?
true
end
end
class TrueClass
def blank?
false
end
end
class Array
alias_method :blank?, :empty?
end
class Hash
alias_method :blank?, :empty?
end
class String
# Is this string just whitespace?
#
# "abc".blank? #=> false
# " ".blank? #=> true
def blank?
/\S/ !~ self
end
end
class Numeric
def blank?
false
end
end
Version data entries
10 entries across 9 versions & 2 rubygems