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copied!<p>see a working fiddle here: <a href="http://jsfiddle.net/K37Fa/" rel="nofollow">http://jsfiddle.net/K37Fa/</a></p> <p>your input-data seems to be an array, so i build a loop around that. if not just see this fiddle where the input data is a simple object: <a href="http://jsfiddle.net/K37Fa/1/" rel="nofollow">http://jsfiddle.net/K37Fa/1/</a></p> <pre><code>var i , result = [], , current , propCounter , content = [ { "name":"5-HP-N/A-N/A-F8", "node":{ "name":"5", "id":14 }, "timeline":{ "epc":null, "m1":null, "m2":null, "m3":1554087600000, "m4":1593572400000, "m5":1625108400000, "m6":1641006000000, "m7":1656644400000 }, "fab":{ "name":"F8", "id":1 } }], // get the milestone in a function getMileStone = function(obj) { propCounter = 1; for(propCounter = 1; propCounter <= 7; propCounter++) { // if m1, m2 and so on exists, return that value if(obj.timeline["m" + propCounter]) { return {key: "m" + propCounter, value: obj.timeline["m" + propCounter]}; } } }; // loop over content array (seems like you have an array of objects) for(i=0;i< content.length;i++) { current = content[i]; firstMileStone = getMileStone(current); result.push({ 'start': new Date(current.epc || firstMileStone.value), 'end': new Date(current.m1 || firstMileStone.value), 'content': firstMileStone.key, 'group' : current.name, 'classname' : firstMileStone.value }); } </code></pre> <p>EDIT: getMileStone is just a helper-function, so you could just call it with whatever you want. e.g. current[i+1]:</p> <pre><code>secondMileStone = getMileStone(current[i + 1]) </code></pre> <p>you should just check, if you are not already at the last element of your array. if so current[i+1] is undefined, and the helperfunction should return undefined.</p> <p>you could then use as fallback the firstMileStone:</p> <pre><code>secondMileStone = getMileStone(current[i + 1]) || firstMileStone; </code></pre> <p>see the updated fiddle (including check in the getMileStone-Helperfunction): <a href="http://jsfiddle.net/K37Fa/6/" rel="nofollow">http://jsfiddle.net/K37Fa/6/</a></p>

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