=46rom the help page:

"After Effects uses JavaScript en= gine when evaluating expressions. The performance of evaluating expressions d= uring renders can be up to 5x faster than the Legacy ExtendScript engine.

On Windows, After Effects uses the V8 open-source JavaScript engine. On macOS, After= Effects uses the JavaScriptCore framework. Both of these engines provide a more mod= ern version of JavaScript than available in ExtendScript, which only support= s the 3rd Edition of the ECMA-262 Standard.

To choose whether a project uses the JavaScript e= ngine or Legacy ExtendScript, in the Project Settings dia= log, click the Expressions tab, and change the Exp= ressions Engine option. Projects saved in previous versions of A= fter Effects default to Legacy ExtendScript.

Higher mathematical precision in floating-point operat= ions.
= Array and string m= ethods from modern JavaScript can be used.
Other modern JavaScript objects like typed arrays, usage o= f keywords 'let' and 'const', and many other additions made in recent versio= ns of the ECMA-262 Standard are available.

The syntax for if/else statements= is strict in the JavaScript engine and need to be written for standardized J= avaScript.
<= span style=3D"background-color: rgba(255, 255, 255, 0);">When accessing the i= ndexes of characters on a Text Layer as an array, use text.sourceText.valu= e[i] instead of text.sourceText[i].
Older snake_case expression methods such as&= nbsp;to_world, which had been previously depr= ecated in ExtendScript) are not supported.
Simplified 'this(arg)' syntax is not supported.

<= br>

https://helpx.adobe.com/after-effects/using/exp= ression-language-reference.html

David Torno

818.39= 1.6060

--------------------

www.sydefxink.com (work history)

https://vimeo.com/davidtorno (work samples & breakdowns)

https://gumroad.com/davidtorno

http://provideocoal= ition.com/dtorno (tutorials)

"The most useless day is that in which we do not laugh"

-Charles Field

On Oct 21, 2018, at 8:22 AM, TIM THIESSEN <AE-List@media-motion.tv> wrote:

=

I haven't download cc2019 (os not up to snuff yet await= ing new compy) but I hear that among other things eval() doesn't work in exp= ressions. Is there any documentation on the changes in the new Javascript en= gine - I haven't seen anything about using eval().
<= br>
Timt

= --Apple-Mail-BA424BBC-3A1F-4D94-A891-D8FCC85133E9--

Improvements provided by the JavaScript engine=

Differences between the JavaScript engine a= nd ExtendScript