I've been experimenting with the ES4 RI lately. I've discovered that the following doesn't work:
x = int; 10 is x; // error 10 to x; // error 10 cast x; // error var y: x; // error Of course, if I had used |type x = int|, it would work. Is this because x is not a compile-time type? I find it a bit odd that |10 is x| didn't work while |10 instanceof x| does work, considering that |is| is touted as the successor to the |instanceof| operator. Or is |instanceof| the run-time counterpart to |is|? Then should |instanceof| work on everything that |is| can work on? These distinctions between compile-time types and these run-time types (e.g. x in the above example) are subtle and confusing. I figure that all these distinctions will trip many ES4 newcomers coming from an ES3 background. BTW, it doesn't seem like the "like" and "wrap" operators are implemented in the RI yet, so I couldn't really test out structural types. -Yuh-Ruey Chen _______________________________________________ Es4-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es4-discuss
