分解对象属性和整个对象本身 [英] Destructure object property AND whole object itself

问题描述

我有一个物体.我知道我可以解构以检索任何条目的值，并使用传播运算符检索其余条目

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 ]

我想知道是否存在用于检索任何条目的值和对象本身重新声明为新var的sintaxis，类似以下内容(尽管我知道这是错误的):

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 ]

提前谢谢！

推荐答案

为什么不做两份作业?

const myObject = {
  a: 1,
  b: 2,
};

const
    { a } = myObject,
    { ...copy } = myObject;

console.log(a);
console.log(copy);

链接的分配对象不起作用，因为嵌套变量是在实际作用域之外创建的.

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

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