aboutsummaryrefslogtreecommitdiffstats
path: root/guides
diff options
context:
space:
mode:
authoryui-knk <spiketeika@gmail.com>2015-04-06 08:37:27 +0900
committeryui-knk <spiketeika@gmail.com>2015-04-06 08:37:27 +0900
commit1917719f003a2681b1f5ec00a54225457fcf0733 (patch)
tree8c98b21fdbccf2839dd715a382e7b2f7139aed7e /guides
parent9040699aed64a725cc66461d63f794abc2f13afc (diff)
downloadrails-1917719f003a2681b1f5ec00a54225457fcf0733.tar.gz
rails-1917719f003a2681b1f5ec00a54225457fcf0733.tar.bz2
rails-1917719f003a2681b1f5ec00a54225457fcf0733.zip
[ci skip] Remove Extensions to `Proc` chapter section
`Proc#bind` is removed with 4.1 release
Diffstat (limited to 'guides')
-rw-r--r--guides/source/active_support_core_extensions.md47
1 files changed, 0 insertions, 47 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index 5fb577e256..ff60f95a2c 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -3040,53 +3040,6 @@ The method `Range#overlaps?` says whether any two given ranges have non-void int
NOTE: Defined in `active_support/core_ext/range/overlaps.rb`.
-Extensions to `Proc`
---------------------
-
-### `bind`
-
-As you surely know Ruby has an `UnboundMethod` class whose instances are methods that belong to the limbo of methods without a self. The method `Module#instance_method` returns an unbound method for example:
-
-```ruby
-Hash.instance_method(:delete) # => #<UnboundMethod: Hash#delete>
-```
-
-An unbound method is not callable as is, you need to bind it first to an object with `bind`:
-
-```ruby
-clear = Hash.instance_method(:clear)
-clear.bind({a: 1}).call # => {}
-```
-
-Active Support defines `Proc#bind` with an analogous purpose:
-
-```ruby
-Proc.new { size }.bind([]).call # => 0
-```
-
-As you see that's callable and bound to the argument, the return value is indeed a `Method`.
-
-NOTE: To do so `Proc#bind` actually creates a method under the hood. If you ever see a method with a weird name like `__bind_1256598120_237302` in a stack trace you know now where it comes from.
-
-Action Pack uses this trick in `rescue_from` for example, which accepts the name of a method and also a proc as callbacks for a given rescued exception. It has to call them in either case, so a bound method is returned by `handler_for_rescue`, thus simplifying the code in the caller:
-
-```ruby
-def handler_for_rescue(exception)
- _, rescuer = Array(rescue_handlers).reverse.detect do |klass_name, handler|
- ...
- end
-
- case rescuer
- when Symbol
- method(rescuer)
- when Proc
- rescuer.bind(self)
- end
-end
-```
-
-NOTE: Defined in `active_support/core_ext/proc.rb`.
-
Extensions to `Date`
--------------------