如何将数组项的每个对象条目与另一个对象的条目进行比较，同时 keeping/remembering 每个比较结果？

Question

我有一个包含 2 个对象的数组 [ { bg: 'a', o: 'c' }, {'hg': 'a2', 'oo': 'c3' } ] 来自 json 文件。我想将数组中的每个对象与另一个看起来像 { fm: 'a', fh: 'b', o: 'a', fe: 'b', ft: 'a', fb: 'c', bg: 'f' } 的对象进行比较，以确定该对象是否在 json 数组中的任何一个对象中都具有两组 key/value 对.我如何比较这些对象？

Answer 1

以下方法利用

Object.entries 以便 provide/access 每个对象的键值对都采用 [key, value].[=17= 的 array/tuple 形式]
Array.prototype.map 以便为每个数组项写入将其每个条目（键值对）与额外提供的对象进行比较的布尔结果。
Array.prototype.every 以检索将数组项的每个条目（键值对）与额外提供的对象进行比较的布尔值。

const sampleArr = [ { bg: 'a', o: 'c' }, {'hg': 'a2', 'oo': 'c3' } ];
const sampleObj = { fm: 'a', fh: 'b', o: 'a', fe: 'b', ft: 'a', fb: 'c', bg: 'f' };


console.log("### How `Object.entries` works ###");
console.log({
  sampleArr
});
console.log(
  "sampleArr[0] => Object.entries(sampleArr[0]) ...",
  sampleArr[0], " => ",  Object.entries(sampleArr[0])
);
console.log(
  "sampleArr[1] => Object.entries(sampleArr[1]) ...",
  sampleArr[1], " => ",  Object.entries(sampleArr[1])
);


console.log("### Comparison 1 with what was provided by the OP ###");
console.log(
  sampleArr
    // create a new array which for each ...
    .map(item => {
      // ... `sampleArr` item retrieves/maps whether ...
      return Object
        .entries(item)
        // ... every entry of such an item exists
        // as entry of another provided object.
        .every(([key, value]) => sampleObj[key] === value)
    })
);


sampleArr.push({ o: 'a', ft: 'a', fh: 'b' }); // will match     ... maps to `true` value.
sampleArr.push({ o: 'a', ft: 'X', fh: 'b' }); // will not match ... maps to `false` value.

console.log("### Comparison 2 after pushing two more items into `sampleArr` ###");
console.log({
  sampleArr
});
console.log(
  sampleArr
    // create a new array which for each ...
    .map(item => {
      // ... `sampleArr` item retrieves/maps whether ...
      return Object
        .entries(item)
        // ... every entry of such an item exists
        // as entry of another provided object.
        .every(([key, value]) => sampleObj[key] === value)
    })
);

.as-console-wrapper { min-height: 100%!important; top: 0; }

如何将数组项的每个对象条目与另一个对象的条目进行比较，同时 keeping/remembering 每个比较结果？

How does one compare every object-entry of an array-item to entries of another object while keeping/remembering each comparison result?

javascript

arrays

comparison

key-value

data-structures