tracker issue : CF-4205248

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Parsing error with fat arrow UDF with default argument value

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Status/Resolution/Reason: Closed/Fixed/Fixed

Reporter/Name(from Bugbase): Bradley W. / ()

Created: 09/24/2019

Components: Language, Closures

Versions: 2018

Failure Type: Crash

Found In Build/Fixed In Build: Update 5 / CF2018U6

Priority/Frequency: Normal / Some users will encounter

Locale/System: / Platforms All

Vote Count: 0

Problem Description:

Passing a fat arrow function to a BIF with a default value on one of the parameters causing a parsing error.

Steps to Reproduce:

myArr = [3,3,3]
writeDump( myArr.reduce( (acc=0,x) => {return acc+x} ) )

Actual Result:

The value cfindex2ecfm554899937$func_CF_ANONYMOUSCLOSURE_444 cannot be converted to a number.

Expected Result:


Any Workarounds:




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.
Comment by Bradley W.
31381 | September 25, 2019 04:32:43 PM GMT
Hi All, This issue is fixed now. Please reach out to ColdFusion support @ [|] to get the patch. -Nimit
Comment by Nimit S.
31460 | September 29, 2019 05:36:38 PM GMT