Filter

const listAverage = [
    {
        "item_code": "",
        "prices": 0,
        "hpp": 0,
        "qty": 0
    },
    {
        "item_code": "10100101",
        "prices": 21258,
        "hpp": 1000,
        "qty": 10
    },
    {
        "item_code": "10100102",
        "prices": 25510,
        "hpp": 500000,
        "qty": 10
    },
    {
        "item_code": "10100103",
        "prices": 29762,
        "hpp": 3000,
        "qty": 10
    }
];

let grossProfitArr = listAverage.filter(function(obj) {
      return obj.item_code !== "10100102";
    });

console.log(grossProfitArr);