Assuming I deleted window.alert, how would I get it back?

Question

Assume I do this in javascript

delete window.alert;
// returns true

then the output of console.log(window.alert); will be \"

Answer 1

The window object is a normal JavaScript object. You can simply "save" the alert function by keeping a reference to it.

const alert = window.alert;
delete window.alert; // window.alert is now undefined
window.alert = alert;