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体验新版 GitCode,发现更多精彩内容 >>
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eaf0d1a4
编写于
4月 19, 2011
作者:
X
Xavier Noria
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commit copy-edit: simplifies blank? rdoc and revises formatting
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571b4a2a
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1
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1 changed file
with
23 addition
and
24 deletion
+23
-24
activesupport/lib/active_support/core_ext/object/blank.rb
activesupport/lib/active_support/core_ext/object/blank.rb
+23
-24
未找到文件。
activesupport/lib/active_support/core_ext/object/blank.rb
浏览文件 @
eaf0d1a4
...
...
@@ -18,8 +18,8 @@ def present?
!
blank?
end
# Returns object if it's
#present? otherwise returns nil
.
#
object.presence is equivalent to object.present? ? object : nil
.
# Returns object if it's
<tt>present?</tt> otherwise returns +nil+
.
#
<tt>object.presence</tt> is equivalent to <tt>object.present? ? object : nil</tt>
.
#
# 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
...
...
@@ -38,72 +38,71 @@ def presence
end
class
NilClass
#
Instances of NilClass are always blank
#
+nil+ is blank:
#
#
=== Exampl
e
#
nil.blank? # => tru
e
#
# nil.blank? # => true
def
blank?
true
end
end
class
FalseClass
#
Instances of FalseClass are always blank
#
+false+ is blank:
#
#
=== Exampl
e
#
false.blank? # => tru
e
#
# false.blank? # => true
def
blank?
true
end
end
class
TrueClass
#
Instances of TrueClass are never blank
#
+true+ is not blank:
#
#
=== Exampl
e
#
true.blank? # => fals
e
#
# true.blank? # => false
def
blank?
false
end
end
class
Array
# An array is blank if it's empty
# An array is blank if it's empty
:
#
# === Examples
# [].blank? # => true
# [1,2,3].blank? # => false
#
# [].blank? # => true
# [1,2,3].blank? # => false
alias_method
:blank?
,
:empty?
end
class
Hash
# A hash is blank if it's empty
# A hash is blank if it's empty
:
#
# === Examples
# {}.blank? # => true
# {:key => 'value'}.blank? # => false
#
# {}.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
# A string is blank if it's empty or contains whitespaces only
:
#
# === Examples
# "".blank? # => true
# " ".blank? # => true
# " something here ".blank? # => false
#
# "".blank? # => true
# " ".blank? # => true
# " something here ".blank? # => false
def
blank?
self
!~
/\S/
end
end
class
Numeric
#:nodoc:
# No number is blank:
#
# 1.blank? # => false
# 0.blank? # => false
#
def
blank?
false
end
...
...
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