Javascript如何将具有值的对象转换为键值对的对象

Question

如何将set只有值的对象转换为键值对包含相同值的对象key？let set = new Set()set.add(a)set.add(example)console.log(set)//OUTPUT {"a", "example"}//perform some operation to get result below ?到{"a":"a","example":"example"}

Answer 1

Set 有一个entries方法，您可以将其传递给Object.fromEntries

let set = new Set();

set.add("a");

set.add("example");

const result = Object.fromEntries(set.entries());

console.log(result);

Answer 2

您可以将其转换为值数组并执行Array.prototype.reduce

let set = new Set()

set.add('a')

set.add('example')

const res = Array.from(set).reduce((acc, val) => ({ ...acc, [val]: val }), {})

console.log(res)

Answer 3

将集合扩展到 anArray并将其减少到 anObject

const set = new Set();

set.add("a");

set.add("b");

set.add("valueC");

console.log(

  [...set]

    .reduce( (acc, val) => ({...acc, [val]: val}), {} )

);

Answer 4

使用forEach：

const set = new Set();

set.add('a');

set.add('example');

const result = {};

set.forEach(i => result[i] = i);

console.log(result)

Answer 5

如果你的意思是["a", "example"]：

var data=["a", "example"];

var obj=data.map(item=>({item:item}));

console.log(obj);