diff options
Diffstat (limited to 'doc/syntax/calling_methods.rdoc')
| -rw-r--r-- | doc/syntax/calling_methods.rdoc | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/doc/syntax/calling_methods.rdoc b/doc/syntax/calling_methods.rdoc index fc806d5c31..c2c6c61a10 100644 --- a/doc/syntax/calling_methods.rdoc +++ b/doc/syntax/calling_methods.rdoc @@ -210,6 +210,24 @@ definition. If a keyword argument is given that the method did not list, and the method definition does not accept arbitrary keyword arguments, an ArgumentError will be raised. +Keyword argument value can be omitted, meaning the value will be fetched +from the context by the name of the key + + keyword1 = 'some value' + my_method(positional1, keyword1:) + # ...is the same as + my_method(positional1, keyword1: keyword1) + +Be aware that when method parenthesis are omitted, too, the parsing order might +be unexpected: + + my_method positional1, keyword1: + + some_other_expression + + # ...is actually parsed as + my_method(positional1, keyword1: some_other_expression) + === Block Argument The block argument sends a closure from the calling scope to the method. @@ -304,18 +322,6 @@ Both are equivalent to: my_method(1, 2, 3) -If the method accepts keyword arguments, the splat operator will convert a -hash at the end of the array into keyword arguments: - - def my_method(a, b, c: 3) - end - - arguments = [1, 2, { c: 4 }] - my_method(*arguments) - -Note that this behavior is currently deprecated and will emit a warning. -This behavior will be removed in Ruby 3.0. - You may also use the <code>**</code> (described next) to convert a Hash into keyword arguments. |