javascript - 在javascript中根据键值条件选择对象

Question

我在 js 中有构造函数:

function car (){
    this.name=name;
    this.position=position;
}

我从上面的构造函数创建了两个 obj 并推送到数组:

arr = [ car{name:car1;position:1},
        car{name:car2;position:2} ]

我还有另一个数组:

map = ["***","car1","***","car2","***"]

我想要它:

for (i = 0; i < arr.length; i++){
    if(map[i] !== "***"){ //for example i=1 and map[1] is car1 and i dont know it!
    //i need select car with name = car1 and change this car's position to 10
    }
}

我不想搜索“car1”。因为在我的主代码中，当新车(car3)进入car1位置时，car1.position必须为0。实际上在 map 中汽车的名称根据汽车的位置插入。

Answer 1

I need to select a car with name = car1 and change this car's position to 10

以下内容应该对您有帮助

map = ["***", "car1", "***", "car2", "***"];

arr = [{
    name: 'car1',
    position: 1
  },
  {
    name: 'car2',
    position: 2
  }
]


for (i = 0; i < arr.length; i++) {
  if (map[i] !== "***") {
    const index = arr.findIndex(x => x.name == map[i]);
    arr[index].position = 10;
  }
}

console.log(arr)