Destructuring in JavaScript and the Object Context

I recently came across this issue on github, the issue was caused by 2 different problems, one of them was due to the destructuring of an object. Here is a summary of the issue by the author:

--- Summary ---

The first issue was the crash with the error message: ERROR: v8::Object::GetCreationContextChecked No creation context available. This error was caused by lib/internal/fs/read/context.js. We were destructuring the result of internalBinding('fs') which caused the creation context of the function being unavailable.

Previously, it was:

  const { close } = internalBinding("fs");
close(fd, req);
  

The fix was:

  const binding = internalBinding("fs");
binding.close(fd, req);
  

--- End of Summary ---

Its important to note that the destructuring of an object can cause the object's orignal context to be lost, this can be a problem when you are trying to access the object context in a function. Here is an example of how this can happen:

  const obj = {
  firstname: "John",
  lastname: "Doe",
  fullname: function () {
    return `${this.firstname} ${this.lastname}`;
  },
};

// Output: John Doe
console.log(obj.fullname());

// destructuring the object
const { fullname } = obj;

// Output:  undefined undefined
console.log(fullname());
  

In the example above, the fullname function is destructured from the obj object, when the function is called, the this keyword is no longer referencing the obj object, this is because the this keyword is determined by how a function is called, not how it is defined.

so be careful when destructuring objects in JavaScript, it can cause the object's context to be lost and could lead to unexpected behavior.