Adding Two-dimensional Arrays In Angular/javascript

I am learning basic javascript here, please help, working on adding two-dimensional arrays, where 0th index will be always date and 1st index will be always integer in array, what

Solution 1:

I see that you updated the snippet so here is an example of using map/filter/reduce to get the output you're looking for.

  $scope.typeAArray = $scope.mainArray.filter(function (obj) {
    return obj.type === 'A';
  }).reduce(function (a, b) {
    var newObj = {
      type: a.type,
      values: []
    };
    a.values.map(function (v, index) {
      newObj.values.push(v);
      newObj.values[index][1] += b.values[index][1];
    });
    return newObj;
  });