var groceryList = [
  {
    item: "Bananas",
    count: 4
  },
  {
    item: "Bananas",
    count: 3
  },
  {
    item: "Brussel Sprouts",
    count: 2
  },
  {
    item: "Bacon",
    count: 100
  },
  {
    item: "Beans",
    count: 19
  },
  {
    item: "Beans",
    count: 5
  }
]

const seen = {}
const newList = []
var removeDups = []
const list = groceryList.map(function(item) {
  // if we haven't this item before (via check on item name) push it into seen object
  // also push it to newList array
  if (!seen[item.item]) {
    seen[item.item] = item
    newList.push(item)
  }
  // if we have seen the item during iteration...
  else if (seen[item.item]) {
    // remove it from the newList array
    removeDups = newList.filter(function(listItem) {
      if (listItem.item == item.item) {
        console.log('matched');
      } else {
        return true
      }
    })

    // and push in the item with the higher count
    if (seen[item.item].count > item.count) {
      removeDups.push(seen[item.item])
    } else {
      removeDups.push(item)
    }
  }
})

console.log(removeDups);