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.fromEntrieslet 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.reducelet 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 anObjectconst 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);