javascript - JS data manipulation -

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i have data this: (the real record has far more this)

year    type    quantity 2011          1000 2012    b       1000 2012    c       1000 2012          1000 2015          1000

json:

[{year:2011, type:a, quantity:1000},...]

and want have result this: (i want every year , every type has record there)

year    type    quantity 2011          1000 2011    b       - 2011    c       - 2012          1000 2012    b       1000 2012    c       1000 2015          1000 2015    b       - 2015    c       -

is there way this? underscore solution welcomed!

vanilla js, includes final sort

var yrs = [], types = [], tmp={};  data.foreach(function(item){      // create arrays of years , types      if(yrs.indexof(item.yr) === -1){         yrs.push(item.yr);     }     if(types.indexof(item.type) === -1){         types.push(item.type);     }     // temp object used in next step holes     tmp[item.yr + item.type] = true; });  yrs.foreach(function(yr){     types.foreach(function(type){         // fill in holes         if(!tmp.hasownproperty(yr+type)){            data.push({yr: yr, type: type, qty: 0});          }     }) });  data.sort(function(a,b){     return b.yr === a.yr ? a.type > b.type : +a.yr - +b.yr });

demo


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