我需要比较两个数组并将输出为一个数组，对象在内部进行比较

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如何解决我需要比较两个数组并将输出为一个数组，对象在内部进行比较？

我有以下代码，这是我之前的一个问题的答案，但我不想把 question 弄乱，我想重申我实际在寻找什么，因为我似乎无法掌握它。

我想要的预期输出现在只是一个具有更改值和 ID 的对象。但是，这需要更改，因此它不会像现在的代码那样在每次实例更改时都会堆积，并且会控制台另一个对象。我只是希望最新的比较得到安慰而忽略上一个。希望这是有道理的。如果需要，我可以进一步解释。

当我说堆叠时，我的意思是，它在下一次状态改变时控制两个项目，然后是三个，依此类推，第四个。我只想要最新的更改，以便我可以运行突变并更新我的数据库

状态改变后的期望结果#1

import eyed3
import urllib.request

audiofile = eyed3.load("D:\\tmp\\tmp_mp3\\track_example.mp3")

audiofile.initTag(version=(2,3,0))  # version is important
# Other data for demonstration purpose only (from docs)
audiofile.tag.artist = "Token Entry"
audiofile.tag.album = "Free For All Comp LP"
audiofile.tag.album_artist = "VarIoUs Artists"
audiofile.tag.title = "The Edge"

# Read image from local file (for demonstration and future readers)
with open("D:\\tmp\\tmp_covers\\cover_2021-03-13.jpg","rb") as image_file:
    imagedata = image_file.read()
audiofile.tag.images.set(3,imagedata,"image/jpeg",u"cover")
audiofile.tag.save()

# Get image from th@R_696_9473@ernet
response = urllib.request.urlopen("https://example.com/your-picture-here.jpg")
imagedata = response.read()
audiofile.tag.images.set(3,u"cover")
audiofile.tag.save()

状态改变后的预期结果#2

  {Col0:"snappy",col10:"292959180223939085"}

  {Col0:"some state change",col10:"292959180223939085"}

const oldState = [{
    "col0": "Decor","col1": "2021-03-31","col2": "okok","col3": true,"col4": 7,"col5": 5,"col6": "Curation","col7": "fsaf","col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615646495/catalog/sse5zxtklsj3ib730zjy.png","col9": 4,"col10": "292959180223939085"
  },{
    "col0": "Decor","col2": "fdsafd","col4": 3,"col5": 3,"col7": "fdsfsa","col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615657360/catalog/qpudbgkrvftjlo5c1yma.png","col9": 5,"col10": "292970573359743501"
  }
]

const saveData = [{
    "col0": "Snappy","col10": "292970573359743501"
  }
]

这是我的实现方式，saveData 状态依赖于到达 useState，所以它总是在变化。

function compareArray(oldItem,newItem) {
  const compared = {};

  for (const key in oldItem) {
    if ((key == 'col10' || oldItem[key] != newItem[key]) && Object.hasOwnProperty.call(newItem,key) && Object.hasOwnProperty.call(oldItem,key)) {
      compared[key] = newItem[key];
    }
  }

  return compared;
}

oldState.map((old,i) => [old,saveData[i]]).forEach((item) => console.log(compareArray(...item)));

更新：每次比较后，它都会向对象添加属性，我希望每次 onblur 事件触发时只有最近更改的属性，这意味着用户已离开输入并触发我的保存突变。

这是一张屏幕截图，显示了对象中的多个属性，它应该只有一个而不是 ID。它应该一起替换对象，而不是每次比较都添加它。数组中还有两个对象，我只需要最近更改的一个，因为我在每次比较时都会触发保存突变，并且只需要一个具有两个字段的对象，即已更改的字段和 ID。

解决方法

const oldState = [{
    "col0": "Decor","col1": "2021-03-31","col2": "okok","col3": true,"col4": 7,"col5": 5,"col6": "Curation","col7": "fsaf","col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615646495/catalog/sse5zxtklsj3ib730zjy.png","col9": 4,"col10": "292959180223939085"
  },{
    "col0": "Decor","col2": "fdsafd","col4": 3,"col5": 3,"col7": "fdsfsa","col8": "https://res.cloudinary.com/kitson-co/image/upload/v1615657360/catalog/qpudbgkrvftjlo5c1yma.png","col9": 5,"col10": "292970573359743501"
  }
]

const saveData = [{
    "col0": "Snappy","col10": "292970573359743501"
  }
]
function compareArray(oldItem,newItem) {
  const compared = {};

  for (const key in oldItem) {
    if ((key == 'col10' || oldItem[key] != newItem[key]) && Object.hasOwnProperty.call(newItem,key) && Object.hasOwnProperty.call(oldItem,key)) {
      compared[key] = newItem[key];
    }
  }

  return compared;
}

let myObject = {}
oldState.map((old,i) => [old,saveData[i]]).forEach((item) => myObject = {...myObject,...compareArray(...item)}
);
console.log(myObject)

const getStateDiff = (oldState,newStatE) => {
  const differences = [];

  for (let i = 0; i < oldState.length; i++) {
    const oldStateKeys = oldState[i];
    const newStateKeys = newState[i];
    const entryDiff = {};

    for (let key in oldStateKeys) {
      if (
        newStateKeys.hasOwnProperty(key) &&
        oldStateKeys[key] !== newStateKeys[key]
      ) {
        entryDiff[key] = newStateKeys[key];
      }
    }

    if (Object.keys(entryDiff).length > 0) {
      entryDiff['col10'] = newStateKeys['col10'];
      differences.push(entryDiff);
    }
  }

  return differences;
};

const oldState = [
  {
    "col0": "Decor","col10": "292970573359743501"
  }
];

const saveData = [
  {
    "col0": "Snappy","col2": "fdsaf","col10": "292970573359743501"
  }
];

console.log(getStateDiff(oldState,saveData));

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