What about an `undefs` function in `Base`?

[mkitti]

Undefs.jl is now registered:

Undefs.jl: Convenience and Experiment

Undefs.jl I created a registered package called Undefs.jl that exports three names: undefs(A = Array, T = Float64, dims) = A{T}(undef, dims): a convenience method similar to ones, zeros, trues, and falses. undef!(array::Array, index=1): An experimental method to reset an element to an #undef state. This also works on Base.RefValue. @undef! A[1]: A macro to make the use of the undef! easier. Demonstration of the convenience constructor, undefs julia> using Undefs julia> mutable struct Foo …