diff options
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 |