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    <h1>How to fill in missing elements in an array describing a range</h1> <p>Presuming the starting array is already sorted, you might want to copy the first element in the source array into a new one and then iteratively push "default objects" into the destination array or copy from the source array when there is a matching object. Repeat until you reach the end of your range.</p> <p>To check if there is a matching object, you might want to index first the source array by whatever parameter you want to iterate over (in your case: the "joined" field). This means that this parameter has to be unique.</p> <pre><code>function getIndex(srcArray, field) { var i, l, index; index = []; for(i = 0, l = srcArray.length; i &lt; l; i++) { index[srcArray[i][field]] = srcArray[i]; } return index; } </code></pre> <p>This creates a hashmap of your array. Searching an element by it's key (in your case the "joined" field) is very simple: </p> <pre><code>if(index['2013-06-05'] !== undefined) { /* the element indexed by "2013-06-05" exists */ } </code></pre> <p>Now that you have an index, you can iterate over the range you expect to have. For this, get the first and the last dates in your source array:</p> <pre><code>//get boundaries var first = new Date(src[0].joined); var last = new Date(src[src.length-1].joined); </code></pre> <p>You also need to know how to construct your default objects:</p> <pre><code>function createDefault(datestr) { return {users: 0, joined: datestr}; } </code></pre> <p>Now declare a destination array and iterate over the range:</p> <pre><code>var dest = []; for(var d = first; d.getTime() &lt;= last.getTime(); d.setDate(d.getDate()+1)) { datestr = dateToYMD(d); //dateToYMD is a helper function I declared that formats a date if(index[datestr]) { //this date exists in your data, copy it dest.push(index[datestr]); } else { //this date does not exist, create a default dest.push(createDefault(datestr)); } } </code></pre> <p>I made a jsfiddle that logs the destination array to console. <a href="http://jsfiddle.net/uNasR/" rel="nofollow">http://jsfiddle.net/uNasR/</a></p>
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    1. COThanks Roman. This was exactly what I needed
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