title: Creating an array of `nothing` of any size in Julia
body: <p>In Julia it is possible to create arrays of any size using the functions <code>zeros(.)</code> or <code>ones(.)</code>. Is there a similar function to create an array that is filled with <code>nothing</code> at initialization but also accepts floats? I mean a function like in this example:</p>
  
  <pre><code>a = array_of_nothing(3)
  # a = [nothing,nothing,nothing]
  a[1] = 3.14
  # a = [3.14,nothing,nothing]
  </code></pre>
  
  <p>I tried to find information on internet, but without success... Sorry, I am a beginner in Julia.</p>