Syntax for constructing a 1x1 matrix

General Usage
10 
using BenchmarkTools
julia> @btime reshape([1],1,1)
  63.990 ns (3 allocations: 192 bytes)
1×1 Array{Int64,2}:
 1

julia> @btime fill(1, (1,1))
  29.674 ns (1 allocation: 96 bytes)
1×1 Array{Int64,2}:
 1

julia> @btime hcat(1)
  33.067 ns (1 allocation: 96 bytes)
1×1 Array{Int64,2}:
 1

The difference between hcat and fill is small, but consistent. I also find fill more elegant.