Setting up a Function Chain with Single Allocation

[rdeits]

@underwhelmed

Is there a way to do this without storing each function separately and composing them all at once towards the end?

First of all, it’s worth asking what the real goal here is. Giving a name to a quantity doesn’t cause any more allocation than not naming it. So if your code is working as-is, you might not need to worry at all.

That said, you might find the ∘ (\circ) function composition operator useful:

julia> f = x -> filter(iseven, x)
#13 (generic function with 1 method)

julia> f = f ∘ (x -> filter(isodd, x))
var"#13#14"() ∘ var"#15#16"()

julia> f([1,2,3,4])
Int64[]