Steve Yegge's rant on The Next Big Language

[Johan Granberg]

janderson wrote:

> Jarrett Billingsley wrote:
>> 
>> Basically it's a way of really easily applying functions and such over a
>> list.  They're kind of like array operations (a[] = b[] + c[]), which D
>> doesn't have yet, but more flexible.  You can do stuff like (using very
>> python-like syntax):
>> 
>> int[] numbers = [1, 2, 3, 4, 5, 6, 7, 8];
>> 
>> // This loops through numbers, seeing if the condition holds true,
>> // and if it does, adds it to a new list, which is eventually assigned
>> // to evens.
>> int[] evens = [x for x in numbers if !(x & 1)];
>> 
>> // Square the list
>> int[] squares = [x * x for x in numbers];
> 
> I'm not sure about these.  The syntax is not much better then a foreach
> loop.

But they are expressions instead of statements which can be important in
some situations, and they are probably more limited (no defined ordering)
something that could be used in optimizations.