过滤掉Typescript中键值数据结构中的唯一数据

const obj = {
  key1: 'value1',
  key2: 'value2',
  key3: 'value3',
  key4: 'value2',
};

const filteredObj = Object.fromEntries(
  Object.entries(obj).filter(([key, value], index, arr) => {
    return arr.findIndex(([k, v]) => v === value) === index;
  })
);

console.log(filteredObj);
// 输出：{ key1: 'value1', key2: 'value2', key3: 'value3' }

const map = new Map([
  ['key1', 'value1'],
  ['key2', 'value2'],
  ['key3', 'value3'],
  ['key4', 'value2'],
]);

const filteredMap = new Map(
  [...map.entries()].filter(([key, value], index, arr) => {
    return arr.findIndex(([k, v]) => v === value) === index;
  })
);

console.log(filteredMap);
// 输出：Map(3) { 'key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3' }