title: Initialize an array of arrays in Julia
body: <p>I'm trying to create an array of two arrays. However, <code>a = [[1, 2], [3, 4]]</code> doesn't do that, it actually concats the arrays. This is true in Julia: <code>[[1, 2], [3, 4]] == [1, 2, 3, 4]</code>. Any idea?</p>
  
  <p>As a temporary workaround, I use <code>push!(push!(Array{Int, 1}[], a), b)</code>.</p>