Destructuring Nested objects in javascript | Destructure second level parent and child Objects

问题

I need to destructure and get values of title, child, childTitle from this object

const obj1 = {
   title : 'foo',
   child : {
               title2 : 'bar'
           }
   }

let {title, child} = obj1;
console.log(title)   //'foo'
console.log(child)   //{ title : 'bar' } 

// but couldn't get child object this way

let { title , child : { title2 } } = obj1;
console.log(title)   //'foo'
console.log(child)   //unDefined
console.log(title2)  //'bar'

How could I get the child object?

回答1:

child: { title2 } is just destructuring the child property. If you want to pick up the child property itself simply specify it in the statement: let { title, child, child: { title2 } } = obj1;

const obj1 = {
  title: 'foo',
  child: {
    title2: 'bar'
  }
}

let { title, child, child: { title2 } } = obj1;

console.log(title);
console.log(child); 
console.log(title2);

回答2:

When doing child : { child : { title2 } }, child is not instantiate, so you can still doing { child, child : { title2 } } to get both title2 and child.

As simple as :

const obj1 = {
  title: "foo",
  child: {
    title2: "bar"
  }
};

const { title, child, child : { title2 } } = obj1  

来源：https://stackoverflow.com/questions/54293147/destructuring-nested-objects-in-javascript-destructure-second-level-parent-and