对象解构赋值 wtf

destructuring_assignment.js

let reslt, x;

reslt = [...null]; // TypeError: null is not iterable
reslt = [...undefined]; // TypeError: undefined is not iterable

reslt = {...null}; // {}
reslt = {...undefined}; // {}

if (x in null) {}
// TypeError: Cannot use 'in' operator to search for 'undefined' in null
if (x in undefined) {}
// TypeError: Cannot use 'in' operator to search for 'undefined' in undefined

for (x in null) {}
// correct

for (x in undefined) {}
// correct