javascript - 如何检查对象数组中是否存在对象并更新数量？

Question

我有一个数组 objArray。我想创建一个函数，以便它检查是否有另一个对象具有相同的 name 键。如果存在，它将在 qty 键中添加 +1。如果该对象不存在，它会将新对象推送到数组。

var objArray = [
  {"name":"bike","color":"blue","qty":2},
  {"name":"boat","color":"pink", "qty":1},
];

var carObj = {"name":"car","color":"red","qty":1};
var bikeObj = {"name":"bike","color":"blue","qty":1};
  
function checkAndAdd (obj) {
    for (var i = 0; i < objArray.length; i++) {
      if (objArray[i].name === obj.name) {
          objArray[i].qty++;
          break;
      }
      else {
          objArray.push(obj);
      }
    };
}

checkAndAdd(carObj);

console.log(objArray);

checkAndAdd(bikeObj);

console.log(objArray);

在 checkAndAdd(carObj); 之后

console.log(objArray);

应该给

[
  {"name":"car","color":"red", "qty":1},
  {"name":"bike","color":"blue","qty":2},
  {"name":"boat","color":"pink", "qty":1},
]

然后 checkAndAdd(bikeObj);

console.log(objArray);

应该给

[
  {"name":"car","color":"red", "qty":1},
  {"name":"bike","color":"blue","qty":3},
  {"name":"boat","color":"pink", "qty":1},
]

提前致谢!

Answer 1

需要检查所有的对象，如果找到一个需要增加数量的项目就退出函数。

如果没有找到推送对象。

var objArray = [{ name: "bike", color: "blue", qty: 2 }, { name: "boat", color: "pink", qty: 1 }],
    carObj = { name: "car", color: "red", qty: 1 },
    bikeObj = { name: "bike", color: "blue", qty: 1 };
  
function checkAndAdd (obj) {
    for (var i = 0; i < objArray.length; i++) {
        if (objArray[i].name === obj.name) {
            objArray[i].qty++;
            return;                             // exit loop and function
        }
    }
    objArray.push(obj);
}

checkAndAdd(carObj);
console.log(objArray);

checkAndAdd(bikeObj);
console.log(objArray);

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