minimumby(f, itr) = itr[argmin(map(f, itr))]
@time minimumby(x->x^2, [-2, 1, 2, 3, 4])
I get
0.044858 seconds (48.96 k allocations: 2.505 MiB)
This is quite slow and a lot of allocations
But if I give the function a name then it’s fast
f(x) = x^2
@time minimumby(f, [-2, 1, 2, 3, 4])
0.000009 seconds (3 allocations: 272 bytes)
Wondering why can’t Julia just “compile” the anonymous function away ?
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