Internet Explorer doesn't support the "const" keyword. Can I use a shim that checks if "const" is supported and, if not, redefines it as var? I guess it would be nice if it enforced the constancy, maybe using object.Freeze, but I'd be okay with a simple shim.
UPDATE: I want this so I can use existing Javascript libraries that use "const" without modifying them. Obviously, find / replace would work, but it's messy and not very maintainable.
You could write a server-side shim, so when the .js
file is requested any const
is replaced by var
when the file is streamed to the browser. (Appropriate word-break / whitespace detection needed)
Since you're on the server you can't detect browser capabilities and would have to depend on the User-Agent string to do this for IE only, or have javascript that runs on the client browser tell the server that it needs non-const code.
I do a similar thing with a "userprefs.css" file that is really backed by a Java servlet, building and streaming the file specifically for each user.
I would use Modernizer for this and load the appropriate script file based on support for Const. You could probably write a Grunt JS plugin that builds out the second version for IE automatically by doing a automatic find and replace for 'const'.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With