Kwaku Oskin (Jun 22 2021 at 08:56): Kwaku Oskin (Jun 22 2021 at 08:56):I guess, I am missing something obvious, but is there any way to destructure a Pair in functions like mean, sum etc?
x = Dict(1 => 2, 3 => 4)
# works
mean(y -> y[2], x)
# not works
mean( (k, v) -> v, x)
Writing y[2] doesn't look very clean
Fredrik Ekre (Jun 22 2021 at 08:59):mean( ((k, v),) -> v, x)
Kwaku Oskin (Jun 22 2021 at 09:02):Ah, good! Thank you.
But now I am thinking, that for such short functions, y[2] is not that bad :-)
Kwaku Oskin (Jun 22 2021 at 09:02):Too many brackets.
Alex Ames (Jun 23 2021 at 03:05):See also first and last, as in mean(y -> last(y), x)
Mason Protter (Jun 23 2021 at 05:39):There's also
mean(x) do (k, v)
v
end
if the ((k, v),) -> v syntax is too hard to read
Kwaku Oskin (Jun 23 2021 at 09:33):It's not to hard, it's just lengthy.
Kwaku Oskin (Jun 23 2021 at 09:34):I wonder, is there any explanation, why mean((k, v) -> v, d) is not working as expected? Is it a bug or a feature?
Fredrik Ekre (Jun 23 2021 at 09:35):(k, v) -> ... is how you define a two-argument anonymous function.
Kwaku Oskin (Jun 23 2021 at 09:41):Ah, you are right, it's one argument-two elements function.
Kwaku Oskin (Jun 23 2021 at 09:41):Yes, then ((k, v), ) make sense.
Last updated: Nov 03 2025 at 04:46 UTC