How to add an object to a nested object, knowing the level of nesting to which the object should be-CodePudding

I have an object

const a = {
  b: {
    c: "new object",
    b: {
      c: "new object",
    }
  }
}

Here, the level of nesting for the key b is 2. I want to add another

 b: {
   c: "new object",
 }

to the last b i.e., 2nd level nested b which will make the object now have 3 level of nested b

The level of nesting is dynamic. It can be 0 as well. That means const a = {}

How can add an object to a nested object, knowing the level of nesting?

eval() is out of option.

I'm currently doing it with lodash.

let currentObj = a;
const thePath = ["b"];
// checking if "b" is present in the object and nesting if present
while (currentObj["b"]) {
  currentObj = currentObj["b"];
  thePath.push("b");
}
lodash.set(a, thePath, {
  c: "new object"
});

Is there any other approach? Can it be achieved with Object.assign somehow?

CodePudding user response：

You could iterate the object and get finally the target object.

const object = { b: { b: { l: 2 }, l: 1 }, l: 0 };
let temp = object,
    depth = 2;

while (depth--) temp = temp.b;

console.log(temp);

Object.assign(temp, { payload: 'foo' });

console.log(object);

.as-console-wrapper { max-height: 100% !important; top: 0; }

CodePudding user response：

Even without Object.assign I was able to make it work.

let currentObj = a;
const thePath = ["b"];
// checking if "b" is present in the object and nesting if present
while (currentObj["b"]) {
  currentObj = currentObj["b"];
}
currentObj["b"] = {
c: "new object"
}
);