Hey there,

I just made this library work in IE and deployed it to my users.

In case anyone else needs IE version, then here is the library in gist form:
https://gist.github.com/pkrumins/ab58506c225d1c388b85665609026a9e

Just drop it in place of the original version and it will work in IE.

Here's the summary of the changes that I made to the library to make it work in IE again:

• Replacing let with var.
• Replacing { x } with { x : x } in object context.
• Replacing class with function.
• Replacing { arg1, arg2, } with opts in function definition context.
• Replacing x of obj with a for (var i = 0; i < obj.length; i++)
• Replacing default arguments with if (arg === undefined) { arg = defaultVal; }
• Replacing array.push(...obj) with array.extend(obj).
• Adding Object.entries polyfill.

Hey @pkrumins,
Thanks for reaching out!

It seems like my transpile target to support everything above Edge 15 was probably a bit too optimistic, since the library got a bit more popular than expected.

Looks like you already found a workable solution though! :)
However, I will anyways take a look at updating my babel and rollup configs to transpile the *.browser version to ES5 for IE compatibilty. I'll leave the regular and *.es/module build as they are though.

Btw. I am curious to check out what you have build. If you got any public address, feel free to share :)

I'd love the transpiled ES5 version. When you release it, I'll drop it in place of my quick modifications. The website that I built is https://onlineMATHtools.com. There are over 40 fractals in there.

@pkrumins nice collection!
Btw. I have compiled a new version (1.5.1) with IE11 support for the browser build. Please try it out and see if its working.

Thanks! Which dist version do I use? Should I try the lindenmayer.browser.min.js file?

Thanks! Which dist version do I use? Should I try the lindenmayer.browser.min.js file?

Yep, both lindenmayer.browser.min.js and lindenmayer.browser.js should work in IE11 now.

Thanks! I just tried and unfortunately it doesn't work because of Object.entries function missing in IE11.

TypeError: Object doesn't support property or method 'entries'

Can you add a polyfill and release one more time? I'll then try again.

@pkrumins ah, missed that one.
I prepared a new release with the Object.entries polyfill for both browser builds. Let me know if it works. :)

For the curious: I tried to auto-polyfill missing IE11 stuff via babel and core-js by using its feature detection, but the resulting build turned out to be immensely overblown compared to the libraries size itself. (about 5x vs. the non-auto-polyfilled size). Thats because core-js adds a bunch of helper functions and glue code to integrate and process its polyfills. Thats useful if you polyfill a bit more and its also not that grave for bigger bundles than this lib, where 60KB more wouldnt be that bad. But for this project it wasn't really a viable solution for me.

Long story short, I decided to manually drop in the polyfill for Object.entries and import it only in the browser builds via a small automated preprocessing step, to make the bundle as small as possible.

Thanks for the new release and your background comments. Unfortunately, there's a new error:

ReferenceError: 'Symbol' is undefined

Can you please look into this? I'll be happy to try it again.

@pkrumins hey there, I pushed a new release that should fix this issue. Please let me know if there is anything else coming up.

@pkrumins Just wanted to check back if the release worked for you in the end, or if there still are language features missing. Unfortunately I currently do not have a good testing environment myself to properly test IE11.

Thanks for checking back. I just tested the library in dist/lindenmayer.browser.min.js and it worked in IE. Hooray!

I'll put it in math tools website now.

Also, here's how you can test things in IE. Try this link: browserling.com/ie/11 - this opens a live IE 11 session.

@pkrumins perfect, thanks! :)