On Fri, Dec 24, 2021 at 10:22:29AM -0000, Stefan Pochmann wrote:
> Chris Angelico wrote:
> > Here's the equivalent as a list comprehension, which I think looks
> > better than either of the above:
> > [x + 1 for x in [1,2,3] if x % 2 == 0]
>
> That's not equivalent. You produce [3] instead of [2, 4]. So you
> rather proved that the proposal does have merit, as it's apparently
> easy to get the list comprehension wrong.
>
> Actually equivalent list comprehension:
> [x for x in [1,2,3] for x in [x + 1] if x % 2 == 0]
Or simpler still:
[x + 1 for x in [1,2,3] if x % 2 != 0]
Or we can use the mighty walrus:
[y for x in [1, 2, 3] if (y:=x+1) % 2 == 0]
(although y leaks out of the comprehension).
Using a hypothetical pipeline syntax with an even more hypothetical
arrow-lambda syntax:
[1, 2, 3] | map(x=>x+1) | filter(a=>a%2) | list
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