title: Efficiently detect missing dates in array and inject a null (highcharts and jquery)
body: <p>I'm using highcharts.js to visualize data series from a database. There's lots of data series and they can potantially change  from the database they are collected from with ajax. I can't guarantee that they are flawless and sometimes they will have blank gaps in the dates, which is a problem. Highcharts simply draws a line through the entire gap to the next available date, and that's bad in my case.</p>
  
  <p>The series exists in different resolutions. Hours, Days and Weeks. Meaning that a couple of hours, days or weeks can be missing. A chart will only show 1 resolution at a time on draw, and redraw if the resolution is changed. </p>
  
  <p>The 'acutal' question is how to get highcharts to not draw those gaps in an efficient way that works for hous, days and weeks</p>
  
  <p>I know highcharts (line type) can have that behaviour where it doesn't draw a single line over a gap if the gap begins with a null. </p>
  
  <p>What I tried to do is use the resolution (noted as 0, 1, 2 for hour day or week), to loop through the array that contains the values for and detect is "this date + 1 != (what this date + 1 should be)</p>
  
  <p>The code where I need to work this out is here. Filled with psudo</p>
  
  <pre><code>for (var k in data.values) {
      //help start, psudo code.
      if(object-after-k != k + resolution){ //The date after "this date" is not as expected
         data.values.push(null after k) 
      }
  
      //help end
      HC_datamap.push({ //this is what I use to fill the highchart later, so not important
          x: Date.parse(k),
          y: data.values[k]
      });
  }
  </code></pre>
  
  <p>the <code>k</code> objects in <code>data.values</code> look like this</p>
  
  <pre><code>2015-05-19T00:00:00
  2015-05-20T00:00:00
  2015-05-21T00:00:00
  ...and more dates
  </code></pre>
  
  <p>as strings. They can number in thousands, and I don't want the user to have to wait forever. So performance is an issue and I'm not an expert here either</p>
  
  <p>Please ask away for clarifications. </p>