According to this page http://kangax.github.io/compat-table/es6/, ES6 features are not implemented in IE 11.
Does IE 11 have a plan for implementing them one day or can I forget about it? Is there a page that explain their intent on that subject?
I read somewhere (I cannot remember where exactly) that they don't plan to fix bugs in IE 11, so my guess is that they won't bother implement new features?
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javascript
internet-explorer
internet-explorer-11
The statement from Microsoft regarding the end of Internet Explorer 11 support mentions that it will continue to receive security updates, compatibility fixes, and technical support until its end of life. The wording of this statement leads me to believe that Microsoft has no plans to continue adding features to Internet Explorer 11, and instead will be focusing on Edge.
If you require ES6 features in Internet Explorer 11, check out a transpiler such as Babel.
Source: Stackoverflow.com