Question

In Javascript, is there any way to prevent a function from being called in a certain section of code? I want to make sure that the function “alert” is not called in a specific section of code.

alert("Hi!"); //this should work normally
var al = alert
//the function "alert" cannot be called after this point

preventFunctionFromBeingCalled(alert, "Do not use alert here: use the abbreviation 'al' instead.");

alert("Hi!"); //this should throw an error, because "console.log" should be used instead here
allowFunctionToBeCalled(alert);
//the function "alert" can be called after this point
alert("Hi!"); //this should work normally

In this case, how should I implement the functions allowFunctionToBeCalled and preventFunctionFromBeingCalled?

Answer 1

You can sort of achieve this like so:

window._alert = window.alert;
window.alert = function() {throw new Error("Do not use alert here, use console.log instead");};

// later:
window.alert = window._alert;
delete window._alert;

But it is major hax.