* [ruby-core:100635] [Ruby master Feature#17292] Hash Shorthand / Punning
@ 2020-10-29 5:07 keystonelemur
2020-10-29 6:26 ` [ruby-core:100638] " keystonelemur
0 siblings, 1 reply; 2+ messages in thread
From: keystonelemur @ 2020-10-29 5:07 UTC (permalink / raw)
To: ruby-core
Issue #17292 has been reported by baweaver (Brandon Weaver).
----------------------------------------
Feature #17292: Hash Shorthand / Punning
https://bugs.ruby-lang.org/issues/17292
* Author: baweaver (Brandon Weaver)
* Status: Open
* Priority: Normal
----------------------------------------
### Set Literal vs Javascript Object Punning
There was a proposal for a Set literal here: https://bugs.ruby-lang.org/issues/16989
```ruby
set = { 1, 2, 3 }
```
...but it was brought up that this is similar to the Javascript Object punning, or Object shorthand syntax:
```js
const a = 1, b = 2, c = 3;
const punnedObject = { a, b, c }
// => { a: 1, b: 2, c: 3 }
```
**Proposition**: I believe we should use brackets (`{}`) for a shorthand Hash syntax similar to Javascript.
### Hash Punning
My first proposal in this feature request is Hash punning, or Hash shorthand:
```ruby
a = 1
b = 2
c = 3
{ a:, b:, c: }
# => { a: 1, b: 2, c: 3 }
```
This syntax avoids the ambiguous syntax of empty block (`{}`) versus empty set (`{}`), and with the presence of Symbols it introduces a distinct syntax that would be easier to parse against.
One potential issue would be mixed syntax:
```ruby
{ a:, b: 2 }
# => { a: 1, b: 2 }
```
### Method Punning
This syntax can also be used for keyword argument and method call punning:
```ruby
def method_name(a:, b:, c:)
a + b + c
end
a = 1
b = 2
c = 3
method_name(a:, b:, c:)
# => 6
```
I believe this existing syntax for required keywords gives credence to the idea of introducing punning to Ruby, as it's very similar to existing syntax, and therefor feels "Ruby-like".
### Pattern Matching
This syntax is also already present and used in pattern matching, making it already part of the language:
```ruby
case { x: 1, y: 2 }
in { x:, y: }
{ x:, y: y + 1} # new
else
# ...
end
```
I believe this further justifies the case for punning syntax.
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
* [ruby-core:100638] [Ruby master Feature#17292] Hash Shorthand / Punning
2020-10-29 5:07 [ruby-core:100635] [Ruby master Feature#17292] Hash Shorthand / Punning keystonelemur
@ 2020-10-29 6:26 ` keystonelemur
0 siblings, 0 replies; 2+ messages in thread
From: keystonelemur @ 2020-10-29 6:26 UTC (permalink / raw)
To: ruby-core
Issue #17292 has been updated by baweaver (Brandon Weaver).
I would agree this is a duplicate, but in the last year we have had the introduction of the pattern matching syntax which makes this less of a syntactical oddity than it may have been in the past.
----------------------------------------
Feature #17292: Hash Shorthand / Punning
https://bugs.ruby-lang.org/issues/17292#change-88274
* Author: baweaver (Brandon Weaver)
* Status: Open
* Priority: Normal
----------------------------------------
### Set Literal vs Javascript Object Punning
There was a proposal for a Set literal here: https://bugs.ruby-lang.org/issues/16989
```ruby
set = { 1, 2, 3 }
```
...but it was brought up that this is similar to the Javascript Object punning, or Object shorthand syntax:
```js
const a = 1, b = 2, c = 3;
const punnedObject = { a, b, c }
// => { a: 1, b: 2, c: 3 }
```
**Proposition**: I believe we should use brackets (`{}`) for a shorthand Hash syntax similar to Javascript.
### Hash Punning
My first proposal in this feature request is Hash punning, or Hash shorthand:
```ruby
a = 1
b = 2
c = 3
{ a:, b:, c: }
# => { a: 1, b: 2, c: 3 }
```
This syntax avoids the ambiguous syntax of empty block (`{}`) versus empty set (`{}`), and with the presence of Symbols it introduces a distinct syntax that would be easier to parse against.
One potential issue would be mixed syntax:
```ruby
{ a:, b: 2 }
# => { a: 1, b: 2 }
```
### Method Punning
This syntax can also be used for keyword argument and method call punning:
```ruby
def method_name(a:, b:, c:)
a + b + c
end
a = 1
b = 2
c = 3
method_name(a:, b:, c:)
# => 6
```
I believe this existing syntax for required keywords gives credence to the idea of introducing punning to Ruby, as it's very similar to existing syntax, and therefor feels "Ruby-like".
### Pattern Matching
This syntax is also already present and used in pattern matching, making it already part of the language:
```ruby
case { x: 1, y: 2 }
in { x:, y: }
{ x:, y: y + 1} # new
else
# ...
end
```
I believe this further justifies the case for punning syntax.
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
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