javascript - 合并 Node js中具有相同字段的两个数组

Question

我有这样的数组

arr1 = [{
    "_id": 1,
    "item": "Pencil",
    "color": "Red"
  },{
    "_id":2,
    "item": "Pen",
    "color": "Yellow"
  },{
    "_id": 3,
    "item": "Pencil",
    "color": "Green"
}]

arr2 = [{
    "value":"Pencil",
    "price":1000,
 },{
    "value":"Pen",
    "price":1500,
 }]

如何将 arr2 合并到 arr1 中，并以 arr2 中的“value”和 arr1 中的“price”作为键？从而得到如下结果

res = [{
        "_id": 1,
        "item": "Pencil",
        "color": "Red",
        "price": 1000
      },{
        "_id":2,
        "item": "Pen",
        "color": "Yellow",
        "price": 1500
      },{
        "_id": 3,
        "item": "Pencil",
        "color": "Green",
        "price": 1000
    }]

Answer 1

您可以使用 map 。例如:

let arr3 = arr1.map((el1) => {
    let found = arr2.find(el2 => el1.item == el2.value)
    if (found)
        el1.price = found.price
    return el1
})

console.log(arr3)