Re: [RFC]Discuss] Syntax for Arrow Functions

Den 2017-06-15 kl. 15:34, skrev Fleshgrinder:

On 6/15/2017 3:29 PM, Björn Larsson wrote:

Seems like the constraints on this feature makes it hard to fly, i.e. 1. Not a hackish implementation 2. Non ambiguous syntax 3. Easy to parse & use syntax for the human HackLang then prioritised 2 & 3 making the end-users happy, but had to sacrifise a clean implementation. Any clue if this was a one- time effort once it was done or something with a lot of drawbacks in terms of maintenance, performance, evolution etc? r//Björn

On Reddit someone proposed the following syntax:

     \() => echo 'Hello, World'

It is used by Haskell if I remember correctly and should not be ambiguous since ( is not allowed in names of classes or functions. It actually aligns well with functions that are called with a fully-qualified name (e.g. \printf('')). Not sure if it would still require hacks though. So applying that one on Sara's example becomes with some

options for the arrow: 8. $someDict->map(\($v) => $v * 2)->filter(\($v) => $v % 3); 9. $someDict->map(\($v) ==> $v * 2)->filter(\($v) ==> $v % 3); 10. $someDict->map(\($v) ~> $v * 2)->filter(\($v) ~> $v % 3); Interesting :) r//Björn