new since ActionScript 3.0 lecture notes

Brendan Eich brendan at
Wed Feb 13 15:48:59 PST 2008

On Feb 13, 2008, at 3:46 PM, Peter Hall wrote:

>>    - Union types are spelled (x|y|z) now, not (x,y,z).
>>      Popularity contest, the pipe character won.
> Didn't notice that change! (and I like it :))

Popularity, but deeper reasons include (a) more future-proof; (b)  
precedent from other PLs.


More information about the Es4-discuss mailing list