> On 18 Dec 2015, at 00:19, T.J. Usiyan via swift-evolution
> <[email protected]> wrote:
>
> With a Cartesian Product type [like
> this](https://github.com/griotspeak/CartesianProduct
> <https://github.com/griotspeak/CartesianProduct>), the for-in-where syntax
> actually gets us to list comprehensions. I'll admit that I might not have
> implemented the best Cartesian Product type possible, but it should
> illustrate that we have what we need.
>
> `for case … in cartProd(cartProd(seq1, seq2), seq3) // An operator for
> cartProd would make it more pleasing to read.`
That’s impressive work, but it strikes me as quite a difficult undertaking to
get there. (Is it just me, or are generators and sequences the most scary part
of Swift?) Also, is it possible to get it working as an expression, or is it
restricted to a ‘for’ statement? If it can only be performed as a ‘for’
statement it will still need an external mutable var to be updated outside of
the loop. It’s fine if you want to just do side-effecty things, like print the
elements, but I’d consider the ability to return a value to be more important.
Al
_______________________________________________
swift-evolution mailing list
[email protected]
https://lists.swift.org/mailman/listinfo/swift-evolution
