Hi!
> Honestly, I cannot think of any case where I'd use a comprehension
> where I would definitely want an array and not a generator. In the
> majority case both work equally well, cool, but I don't know when I
> would even use an array-dependent version.
They wouldn't work equally well. Generator is only
sequentially-addressable, and array is random-addressable. And in PHP
people do a lot of random addressing of arrays. Also, many functions
which accept arrays (and array type) won't work with generators.
> And converting from a generator to an array is trivial; the other
> way, very not so much.
Well, doing everything not using this syntax is trivial - if the point
is not doing anything that is already trivial, then we don't need this
syntax, as iterating over an array/sequence and applying an operation to
it is already trivial in both array and generator contexts, it's a
two-liner function in most cases. If the point is to add syntax sugar
for most frequently used cases, then I claim that the most frequently
used case is definitely not the generator one. I don't think I ever used
the generator one in python (I use list one all the time), and I maybe
used analogous construct in PHP once or twice (and again I use array_map
and more complex syntax for array transformations all the time).
BTW, how it's not trivial to make generator from array?
function generate($array) { foreach($array as $k => $v) yield $k => $v; }
Is there something I'm missing here?
--
Stas Malyshev
[email protected]
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