Alternative keywords

[JorisBlanken]

Hello,

This is an extension of the discussion I started in Issue 138.

Using the syntax in the linked discussion I propose the when keyword can be eliminated, also I'd like to propose to change case to match instead.
When statements can instead simply be delimited by a semi-colon, which can be handled optionally as it currently is in JavaScript.

Example:

const factorial = n => match (n) {
    0 -> 1;
    n -> n * factorial(n - 1);
}

I'd like to hear other's thoughts on this.

Thanks,
Joris

[JorisBlanken]

Noticed other issues cover this