Array objects can be tricky to update. To avoid repetition, here is a snippet to find by key/name and update value.

findAndUpdateDuplicateArrayObject

var data = [
     {name:'a',value:'aa'},
     {name:'b',value:'bb'}
 ];

 function updateData(obj){
  var objFound_bool = false;
  for (var i = 0; i < data.length; i++) {
    if(obj.name === data[i].name){
      objFound_bool = true;
      data[i].value =obj.value ;
    }
  }
  if(!objFound_bool){
    data.push(obj)
  }
 }