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| author | Kasper Timm Hansen <kaspth@gmail.com> | 2016-12-29 20:20:34 +0100 |
|---|---|---|
| committer | Kasper Timm Hansen <kaspth@gmail.com> | 2016-12-29 20:20:34 +0100 |
| commit | f2f4fecdf47b1f624139be2124b7813a37b29764 (patch) | |
| tree | ce92093c884874fe0caf360c32323155a72ab0a0 /guides | |
| parent | 80ddb7ee2ee078a3c457eefa49184f4fd699a91a (diff) | |
| download | rails-f2f4fecdf47b1f624139be2124b7813a37b29764.tar.gz rails-f2f4fecdf47b1f624139be2124b7813a37b29764.tar.bz2 rails-f2f4fecdf47b1f624139be2124b7813a37b29764.zip | |
[ci skip] Rejigger the dublicable? wording a bit.
Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/active_support_core_extensions.md | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index bfe6b7b7ea..67bed4c8da 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -135,10 +135,10 @@ NOTE: Defined in `active_support/core_ext/object/blank.rb`. ### `duplicable?` -In Ruby 2.4 most objects can be duplicated throuh `dup` or `clone`, except -method objects and certain numbers. Ruby 2.2 and 2.3 can't duplicate `nil`, -`false`, `true`, and symbols, as well as instances of `Float`, `Fixnum` -and `Bignum`. +In Ruby 2.4 most objects can be duplicated via `dup` or `clone` except +methods and certain numbers. Though Ruby 2.2 and 2.3 can't duplicate `nil`, +`false`, `true`, and symbols as well as instances `Float`, `Fixnum`, +and `Bignum` instances. ```ruby "foo".dup # => "foo" @@ -147,8 +147,7 @@ and `Bignum`. Complex(0).dup # => TypeError: can't copy Complex ``` -Active Support provides `duplicable?` to programmatically query an object about -this property: +Active Support provides `duplicable?` to query an object about this: ```ruby "foo".duplicable? # => true @@ -158,10 +157,11 @@ Complex(1).duplicable? # => false 1.method(:+).duplicable? # => false ``` -`duplicable?` returns the correct result for the version of Ruby used. +`duplicable?` matches Ruby's `dup` according to the Ruby version. + +So in 2.4: ```ruby -# version 2.4 nil.dup # => nil :my_symbol.dup # => :my_symbol 1.dup # => 1 @@ -169,8 +169,11 @@ nil.dup # => nil nil.duplicable? # => true :my_symbol.duplicable? # => true 1.duplicable? # => true +``` -# version 2.2 and 2.3 +Whereas in 2.2 and 2.3: + +```ruby nil.dup # => TypeError: can't dup NilClass :my_symbol.dup # => TypeError: can't dup Symbol 1.dup # => TypeError: can't dup Fixnum |