Returns a new array with objects that have a unique value by the prop that is passed to it.

Remove objects with duplicate prop value in array

// Prop is the prop you want to check in the array for a unique value
// objectArray is the original array of objects
function deDupeArrByPropReduce(objectArray, prop) {
  return objectArray.reduce(function (acc, obj, ind, arr) {
  // acc is the accumulator. On line 14 we pass an emtpy array as the inital value
    if (acc.findIndex(obj1 => {
        // We check if the accumulator has an object with the same value as the iterated obj. 
        return obj1[prop] === obj[prop];
    }) == -1) {
    // if the findIndex function returns -1 we add the object to the accumulator
      acc.push(obj);
    }
    return acc;
  }, []);
}