> My proposed solution here is to try to capture the spirit of Python’s slice syntax rather than the exact syntax itself. We can accomplish this using an alternative syntax where we use double square brackets and commas in place of colons: array[::-1] => array[[,,-1]], array[:n] => array[[,n]], array[-5::2] => array[[-5,,2]], and so on. This might not be quite as concise as Python’s syntax, but it only requires two extra keystrokes per slice and I think it’s as close as we’re gonna get.

I wonder if it makes more sense to write a babel plugin to support the python syntax. Since everyone using es6 features are transpiling anyway.