Delete property and its values in all the object

I’m a beginner in javaScript, I have this object MyGraph:

const MyGraph = {
    a: { b: 5, c: 2 },
    b: { a: 5, c: 7, d: 8 },
    c: { a: 2, b: 7, d: 4, e: 8 },
};

I want to delete property "a" and its values in other properties as well to get this result:

const MyGraph = {
    b: { c: 7, d: 8 },
    c: { b: 7, d: 4, e: 8 },
};

I tried like this:

for(let XXX of Object.keys(MyGraph)){
    console.log(XXX.a);
    delete XXX.a;
}

the result of execution:

undefined
undefined
undefined

any help!

>Solution :

You could use a recursive algorithm :

function del_entries(key, obj) {
  if (obj.hasOwnProperty(key)) {
    delete obj[key];
  }

  // Or with Object.hasOwn, not fully supported by old browsers but more up to date
 /*
 if (Object.hasOwn(obj, key)) {
     delete obj[key]
 }
 */
  
  Object.values(obj).forEach(o=> del_entries(key, o))
}


const MyGraph = {
    a: { b: 5, c: 2 },
    b: { a: 5, c: 7, d: 8 },
    c: { a: 2, b: 7, d: 4, e: 8 },
};

del_entries("a", MyGraph);

console.log(MyGraph)