Why is control flow different in browser and node?

Question

JavaScript

The code

'use strict';

function mutator(obj) {
  obj.someProp = 0
};

const A = {a: 3};

console.log('before', A);
mutator(A);
console.log('after', A);

Result in browser:

before {a: 3, someProp: 0}
after {a: 3, someProp: 0}

Result in node:

before { a: 3 }
after { a: 3, someProp: 0 }

Why does browser code run asynchronously?

Answer 1

That's right. When you "expand" an object in the browser, it mutates to the current state (there is even a mark next to it).

Answer 2

They both run asynchronously. Nobody said that the order of asynchronous operations will be the same) we must not forget that node is not js, but a virtualization environment