[ruby-core:101808] [Ruby master Feature#16746] Endless method definition

Issue #16746 has been updated by etienne (部ienne Barri薊.


I haven't seen it mentioned in the comments so I just wanted to point out that the regular method-definition syntax doesn't require semicolons, and is very close to this experiment, given the parentheses are mandatory:

``` ruby
def fib(x) x < 2 ? x : fib(x-1) + fib(x-2) end

# one-line style
def value() @value end
# one-line style 3.0
def value() = @value

# one-line style setter
def value=(value) @value = value end
# not supported in 3.0
def value=(value) = @value = value
```

It doesn't remove the `end` which is the purpose of this feature sorry, but I like it because it keeps the consistency of having `end`, while not using more punctuation like `;` or `=`.

----------------------------------------
Feature #16746: Endless method definition
https://bugs.ruby-lang.org/issues/16746#change-89635

* 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)


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