javascript - Remove duplicate from an array on a particular condition using jQuery

Question

I have an array like this:

var SOItems = [
  { ID: "10", RevNo: 0 },
  { ID: "11", RevNo: 0 },
  { ID: "10", RevNo: 1 },
  { ID: "10", RevNo: 2 },
  { ID: "12", RevNo: 0 },
  { ID: "12", RevNo: 1 }
]; 

I have gone through Remove Duplicate and Get Unique and it works but not as expected because it returns the first matching value. I want those unique items whose RevNo is greater like:

SOItems = [
  { ID: "11", RevNo: 0 },
  { ID: "10", RevNo: 2 },
  { ID: "12", RevNo: 1 }
];

Please suggest me a solution

Answer 1

I would use reduce which will kep track of the ids. If it has seen it, look for the rev number that is greater. After reduce is done, use Object.values() to return it to the array of objects.

var SOItems = [{ID:"10",RevNo:0},{ID:"11",RevNo:0},{ID:"10",RevNo:1},{ID:"10",RevNo:2},{ID:"12",RevNo:0},{ID:"12",RevNo:1}]; 

var result = Object.values(SOItems.reduce( function (acc, item) {
  var last = acc[item.ID];
  if (!last || item.RevNo > last.RevNo) {
    acc[item.ID] = item;
  }
  return acc;
}, {}));

console.log(result);