Hi all,
This email proposes a shorthand syntax for declaring a list of
single-expression functions.
A similar albeit more verbose attempt to provide short functions[1] failed late
last year, but I was recently inspired by Sebastian Bergmann's Type library[2]
that he referenced in a comment on another thread.
Consider the `Type` class[3] in the `SebastianBergmann\Type` namespace. It
contains 60 lines of function declaration to define 14 functions that all
return `false`. Even though it really is a simple class it is rather hard to
wrap one's head around quickly because of all the bloating boilerplate
required. At least IMO.
Consider instead if we had the following syntax?
public function list: bool
{
isCallable() => false,
isFalse() => false,
isGenericObject() => false,
isIntersection() => false,
isIterable() => false,
isMixed() => false,
isNever() => false,
isNull() => false,
isObject() => false,
isSimple() => false,
isStatic() => false,
isUnion() => false,
isUnknown() => false,
isVoid() => false,
}
The idea here is to group a 'list' of functions — in this case of the same type
— and then use shortened single expression fn() syntax for each function. And
with a monospace font in your editor of choice this code could be made even
easier to grok by left-aligning the return values.
I chose the keyword `list` because it is already a reserved word, but the word
`case` could also be used for the same reason, if people prefer that.
Further, instead of `function list` or `function case` we could have `fn list`,
`fn case`, `fn() list` or `fn() case`, whichever feels best to the most people.
This could also work for abstract functions noting that the typehint is applied
to each function instead of the list declaration, e.g.:
abstract public function list
{
isAssignable(self $other): bool;
name(): string;
allowsNull(): bool;
}
Those two changes shorten Type.php from 140 lines down to 90 lines, and IMO,
make the class much easier to read. You can see it here[4].
One more example, this time his `NullType` class[5] using mixed type hints and
going from a total of 38 lines down to 26 lines[6]:
public function list
{
name(): string => 'null',
asString(): string => 'null',
allowsNull(): bool => true,
isNull(): bool => true,
}
What do you think? Is this approach any more appealing than the last one
proposed?
-Mike
[1] https://wiki.php.net/rfc/short-functions
[2] https://github.com/sebastianbergmann/type
[3] https://github.com/sebastianbergmann/type/blob/master/src/type/Type.php
[4] https://gist.github.com/mikeschinkel/6f8c9cf6700a75e75e2725db1ed4da61
[5] https://github.com/sebastianbergmann/type/blob/master/src/type/NullType.php
[6] https://gist.github.com/mikeschinkel/a93aabd61127b0c3ba28c5caf4ebe005
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