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I see the workaround works in node as well. Thanks for the tip!

$ node
> function foo() {
... for (var i = 0; i < arguments.length; i++) {
..... console.log(arguments[i]);
..... }
... }
undefined
> foo(1,2)
1
2
undefined
> foo(100)
100
undefined
> foo(1,2,3,4,5)
1
2
3
4
5
undefined
>

I was testing espruino on the Linux command line (while waiting for my boards to be shipped) and ran across this error. Is this a bug, or a feature?

$ espruino
Interactive mode.
Size of JsVar is now 32 bytes
Size of JsVarRef is now 4 bytes
Added SIGINT hook
Added SIGHUP hook
Added SIGTERM hook

 ____                 _ 
|  __|___ ___ ___ _ _|_|___ ___ 
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v04.8 (c) 2019 G.Williams

Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate

>function foo(x,y) {
:for (var i = 0; i < arguments.length; i++) {
:console.log(arguments[i]);
:}
:}
=function (x,y) { ... }
>foo(1,2)
1
2
=undefined
>foo(100)
100
Uncaught ReferenceError: "1" is not defined
 at line 2 col 24
console.log(arguments[i]);
                       ^
in function "foo" called from line 1 col 8
foo(100)
       ^
>quit()
=undefined
>

The source was cloned from github and compiled on Ubuntu 16.04.6 LTS. I got the same error on an OS X build as well. It was built with the following commands:

export BOARD=LINUX
source ./scripts/provision.sh $BOARD
 make clean && RELEASE=1 BOARD=$BOARD make

I saw this post Functions with unknown amount of args. but I didn't get the same results.

jrh:
Chicago, IL USA