Re: [RFC]Discuss] Syntax for Arrow Functions

On Fri, Jun 9, 2017 at 7:23 AM, Björn Larsson <bjorn.x.larsson@telia.com> wrote: > If I take the liberty in using the example above on our option list: > 1. $someDict->map(fn($v) => $v * 2)->filter(fn($v) => $v % 3); > 2. $someDict->map(function($v) => $v * 2)->filter(function($v) => $v % 3); > 3. $someDict->map($v ==> $v * 2)->filter($v ==> $v % 3); > 4. $someDict->map(($v) => $v * 2)->filter(($v) => $v % 3); // > Ambiguous > 5. $someDict->map([]($v) => $v * 2)->filter([]($v) => $v % 3); > > Old proposals: > 6. $someDict->map($v ~> $v * 2)->filter($v ~> $v % 3); > 7. $someDict->map(lambda($v) => $v * 2)->filter(lambda($v) => $v % 3); > Something else which really pops in these examples is the effect of not needing to use parentheses when embedding a single-arg short lambda. 3 and 6 in your list read cleaner to me (due to the lack of parenthesis clutter). Sadly ~> has the same hacky implementation issues as ==>, but I think that shows a little bit of why the HackLang team decided the messy lexer was worth the clearer syntax. -Sara