问题
I have an object. I know I can destructure to retrieve the value of any entry, and use spread operator to retrieve the rest of them
const [a, ...rest] = [1, 2, 3];
console.log(a); // 1
console.log(rest); // [ 2, 3 ]
I would like to know if there is any sintaxis to retrieve both a value of any entry, and the object itself redeclared to a new var, something like the following —although I know is wrong—:
const [a], myArrayInANewVar = [1, 2, 3];
console.log(a); // 1
console.log(myArrayInANewVar); // [ 1, 2, 3 ]
Thanks in advance!
回答1:
Why not take two assignments?
const myObject = {
a: 1,
b: 2,
};
const
{ a } = myObject,
{ ...copy } = myObject;
console.log(a);
console.log(copy);A chained assignemnt does not work because the nested variables are created outside of the actual scope.
function ownScope() {
const
myObject = { a: 1, b: 2, },
{ a } = { ...copy } = myObject;
console.log(a);
console.log(copy);
}
ownScope();
console.log(copy); // global回答2:
const [a] = (myArrayInANewVar = [1, 2, 3]);
console.log(a); // 1
console.log(myArrayInANewVar); // [ 1, 2, 3 ]
来源：https://stackoverflow.com/questions/65354700/destructure-object-property-and-whole-object-itself