From: mame@... Date: 2020-08-31T08:19:15+00:00 Subject: [ruby-core:99789] [Ruby master Feature#16746] Endless method definition Issue #16746 has been updated by mame (Yusuke Endoh). In the previous dev-meeting, matz said that it should be prohibited to define setter method with endless definition. ```ruby # prohibited def foo=(x) = @x = x ``` There are two reasons: 1. This code is very confusing and it is not supposed that a destructive operation is defined in this style. 2. We want to allow `def foo=42` as `def foo() = 42` in future. It is difficult to implement it in short term, though. If `def foo=(x) = @x = x` is allowed once, it will become more difficult. I will create a PR soon. ---------------------------------------- Feature #16746: Endless method definition https://bugs.ruby-lang.org/issues/16746#change-87305 * Author: mame (Yusuke Endoh) * Status: Closed * Priority: Normal * Assignee: nobu (Nobuyoshi Nakada) ---------------------------------------- Ruby syntax is full of "end"s. I'm paranoid that the ends end Ruby. I hope Ruby is endless. So, I'd like to propose a new method definition syntax. ```ruby def: value(args) = expression ``` As you see, there is no "end". Examples. ```ruby def: hello(name) = puts("Hello, #{ name }") hello("endless Ruby") #=> Hello, endless Ruby ``` ```ruby def: inc(x) = x + 1 p inc(42) #=> 43 ``` ```ruby x = Object.new def: x.foo = "FOO" p x.foo #=> "FOO" ``` ```ruby def: fib(x) = x < 2 ? x : fib(x-1) + fib(x-2) p fib(10) #=> 55 ``` Limitations. * `def: foo x = x` is invalid; the parentheses for formal arguments are mandatory. * `private def: foo = x` is invalid; this method definition cannot be an method argument. A patch is attached. No conflicts. ---Files-------------------------------- endless-method-definition.patch (2.47 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: