Map,Set,Array,Object之间的相互转换

1，Object转Map

let arr={foo:'hello',bar:100};

let map=new Map(Object.entries(arr));

console.log(map)

2,Map转Object

let map=new Map([['foo','hello'],['bar',100]]);

let obj=Object.fromEntries(map);

console.log(obj);

3,Object转Array

let obj={'foo':'hello','bar':100};

let arr=Object.entries(obj);

console.log(arr);

4,Array转成Object

let arr=[['foo','hello'],['bar',100]];

let obj=Object.fromEntries(arr);

console.log(obj);

5,Object转Set

let obj={'foo':'hello','bar':100};

let set=new Set(obj);

6,Set转Object

let obj={'foo':'hello','bar':100};

let set=new Set(obj);

let newObj=Object.formEntries(set);

console.log(newObj);

7,Array转Set

let arr=[['foo','hello'],['bar',100]];

let set=new Set(arr);

console.log(set)
转自：https://www.jianshu.com/p/1ce8949647f9?from=timeline