Match for sparse array initialization

[benkj]

I've realized that Match.jl is perfect for creating in julia an equivalent of SparseArray
https://reference.wolfram.com/language/ref/SparseArray.html
which I find quite useful in Mathematica.

my basic implementation is this

macro sparsearray(size, rule)
    return quote
        _A = spzeros($size...)
        $(push!(rule.args, :(_ => 0)))

        for _itr in eachindex(_A)
            _A[_itr] = @match(_itr.I, $rule)
        end
        _A
    end
end

an example is

@sparsearray (5,5)  begin
        (n,m), if n==m+1 end => m
        (n,m), if n==m-1 end => n+10
        (1,5) => 1
end 

which creates the matrix
0.0 11.0 0.0 0.0 1.0
1.0 0.0 12.0 0.0 0.0
0.0 2.0 0.0 13.0 0.0
0.0 0.0 3.0 0.0 14.0
0.0 0.0 0.0 4.0 0.0

perhaps other people may find this application interesting, so it would be nice to include an example like this in the documentation

[kmsquire]

Added to the docs--thanks!