Is it possible to broadcast the property of a structure?

General Usage
,
1

Often I need to “broadcast” the field of a given structure, e.g.:

struct Foo
    id::Int64
end
mylist = [Foo(1),Foo(2),Foo(1)]
[e.id for e in mylist]

There is no way to broadcast the dot indicating field ownership, e.g. mylist..id ? :slight_smile:

2

getproperty is the function being called with the dot syntax, so you can broadcast that function directly:

julia> getproperty.(mylist, :id)
3-element Vector{Int64}:
 1
 2
 1
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3

The comprehension seems to be much more efficient than getproperty (at least in Julia 1.7.2):

struct Foo
    id::Int64
end
mylist = [Foo(rand(1:10)) for _ in 1:10_000]

f(mylist) = [e.id for e in mylist]
g(mylist) = getproperty.(mylist, :id)

@btime f($mylist)   # 5.3 μs (2 allocs: 78 KiB)
@btime g($mylist)   # 152 μs (10003 allocs: 234 KiB)
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