Extracting Array element type for subsequent use

General Usage
9

The signature should be defined as: foo(x::Vector{T}) where {T} instead.

Notice you are indeed able to get the type of the Vector from T as well as from eltype(x), ie.:

julia> function foo(x::Vector{T}) where {T}
           @show(T, T == eltype(x))
           return nothing
       end
foo (generic function with 1 method)

julia> a = rand(5);

julia> b = rand(Int, 5);

julia> foo(a)
T = Float64
T == eltype(x) = true

julia> foo(b)
T = Int64
T == eltype(x) = true