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Fat arrow functions shouldn't require parentheses around single parameter

Description

https://www.sitepoint.com/es6-arrow-functions-new-fat-concise-syntax-javascript/

When a fat arrow function only has only param, the parentheses should be optional:

Right now Lucee requires this syntax:

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Created 14 August 2019 at 14:16
Updated 6 March 2025 at 11:35

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Zac Spitzer5 June 2020 at 09:54

Brad Wood25 September 2019 at 16:33

Here's a set of tests that show all known bugs in Lucee and Adobe CF's fat arrow functions along with a reference implementation in JS where everything passes.

https://github.com/bdw429s/CFML-lambda-fat-arrow-functions

Brad Wood24 September 2019 at 22:34

Adobe 2018 update 5 came out today and supports this syntax. Transitioning this ticket to an incompatibility.

Brad Wood23 September 2019 at 21:49

ACF 20128 U5 only allows the parens to be optional if there is no type or default specified.

John Berquist23 September 2019 at 20:46

That all sounds good to me - I was wondering though if that syntax was valid in ACF?

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