如果对象和数组值在 javascript 中匹配，如何获取对象键

Question

我想知道如何比较对象值和数组值在 javascript

如果array value和object value相同，那么return如何

object key javascript

中的值


var result = obj.values(obj).includes(arr2) ? 
'status: active' : 'status: inactive'

var obj = {
  "active": 12,
  "inactive": 14
  "neutral": 16
}

var arr1=[12]
var arr2=[12, 14]
var arr3=[12, 16]


Expected Output

//for arr1
status: active
// for arr2
status: active
status: neutral
// for arr3
status: active
status: inactive

Answer 1

您应该检查数组是否包含对象值，反之亦然：

function* matches(object, array) {
  for (const [key, value] of Object.entries(object)) {
    if (array.includes(value))
      yield key;
  }
};

for (const match of matches(obj, arr1))
  console.log(`status: ${match}`);

for (const match of matches(obj, arr2))
  console.log(`status: ${match}`);

for (const match of matches(obj, arr3))
  console.log(`status: ${match}`);

这应该有效。

Answer 2

您可以简单地遍历数组，然后尝试获取 Object.entries(obj) 编辑的 [key, value] 元组 return，其 value 与数组值匹配。一旦找到，你 return 元组中的 key，即：

arr.map(v => Object.entries(obj).find(x => x[1] === v)[0]);

注意：如果你的数组可能包含对象中不的值，上面的代码将抛出错误，因为.find() 将 return 未定义。如果是这种情况，您需要捕获使用无效值的情况（防御性设计）：

arr.map(v => {
  const foundTuple = Object.entries(obj).find(x => x[1] === v);
  return foundTuple ? foundTuple[0] : null;
});

请参阅下面的概念验证：

const obj = {
  "active": 12,
  "inactive": 14,
  "neutral": 16
}

const arr1 = [12];
const arr2 = [12, 14];
const arr3 = [12, 16];
const invalid_arr = [12, 999];

function getKeys(obj, arr) {
  return arr.map(v => {
    const foundTuple = Object.entries(obj).find(x => x[1] === v);
    return foundTuple ? foundTuple[0] : null;
  });
}

console.log(getKeys(obj, arr1));
console.log(getKeys(obj, arr2));
console.log(getKeys(obj, arr3));
console.log(getKeys(obj, invalid_arr));

Answer 3

另一种解决方案

const obj = { "active": 12, "inactive": 14, "neutral": 16 }

const arr1 = [12];
const arr2 = [12, 14];
const arr3 = [12, 16];

const getStatuses= (obj, arr) => arr
  .map(arrValue => {
    const [status] = Object.entries(obj)
      .find(([objKey, objValue]) => objValue === arrValue) 
      ?? [null];
    return { status };
  });

console.log(getStatuses(obj, arr1));
console.log(getStatuses(obj, arr2));
console.log(getStatuses(obj, arr3));

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

Answer 4

使用 Object.keys() 获取键，然后通过从原始对象中获取值来过滤它们，并检查它是否包含在数组中：

const getStatus = (obj, arr) => Object.keys(obj)
  .filter(key => arr.includes(obj[key]))
  
const obj = { "active": 12, "inactive": 14, "neutral": 16 }

const arr1 = [12];
const arr2 = [12, 14];
const arr3 = [12, 16];

console.log(getStatus(obj, arr1));
console.log(getStatus(obj, arr2));
console.log(getStatus(obj, arr3));

如果对象和数组值在 javascript 中匹配，如何获取对象键

how to get the object key if the object and array value matches in javascript

javascript

arrays

loops

object

array-map