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Feature #12820
closed
Shorter syntax for assigning a method argument to an instance variable
Status:
Rejected
Assignee:
-
Target version:
-
Description
Hello,
The pattern:
class Person
def initialize(name:)
@name = name
@age = 0
end
end
is so common, that Cristal Programming Language has a shortcut for it:
https://crystal-lang.org/docs/syntax_and_semantics/methods_and_instance_variables.html
class Person
def initialize(@name : String)
@age = 0
end
end
This is a feature request to implement the same style to Ruby syntax, supporting both isolated parameters and Hash style parameters. Eg:
class Person
attr_reader :name, :age
def initialize(@name, @age:)
end
end
fabio = Person.new("Fabio", age: 34)
fabio.name #=> "Fabio"
fabio.age #=> 34
This will be very useful in methods that accept a lot of parameters and certainly will avoid bugs due to decreased duplicated code (eg: addind a new parameter to a method, and forgetting to set the instance variable to it). Other than implementing support for the syntax itself, I believe RDoc would also have to be updated, not to expose the "@" on documentation (as it is not relevant there).
What do you think?
Thank you.
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