javascript - typescript : Add an autoincrement id attribute of each object in array

Question

我有这个对象数组:

myArray = [
        {
            "edoId": "4010",
            "storeName": "ABBEVILLE"
        },
        {
            "edoId": "3650",
            "storeName": "AGEN"
        },
        {
            "edoId": "3298",
            "storeName": "AIX ALLEES PROVENCALES"
        },
        {
            "edoId": "3309",
            "storeName": "AIX JAS DE BOUFFAN"
        },
        {
            "edoId": "3313",
            "storeName": "AIX LA PIOLINE"
        },
        {
            "edoId": "2119",
            "storeName": "AIX LES BAINS"
        },
    ...
    ]

我想为数组的每个对象设置一个自动递增的 id 属性，使用 forEach(不使用 myArray.length 循环)

建议？

Answer 1

您可以使用 forEach()您在问题中想要的方法:

myArray.forEach(function(item, index){
    item.id = index;
    // or do whatever you want using index
});

forEach() executes the provided callback once for each element present in the array in ascending order. It is not invoked for index properties that have been deleted or are uninitialized (i.e. on sparse arrays). callback is invoked with three arguments:

1. the element value
2. the element index
3. the array being traversed

var myArray = [
        {
            "edoId": "4010",
            "storeName": "ABBEVILLE"
        },
        {
            "edoId": "3650",
            "storeName": "AGEN"
        },
        {
            "edoId": "3298",
            "storeName": "AIX ALLEES PROVENCALES"
        },
        {
            "edoId": "3309",
            "storeName": "AIX JAS DE BOUFFAN"
        },
        {
            "edoId": "3313",
            "storeName": "AIX LA PIOLINE"
        },
        {
            "edoId": "2119",
            "storeName": "AIX LES BAINS"
        }
    ];

myArray.forEach(function(item, index){
  item.id = index;
});

console.log(myArray);