Removing the property of an object within its definition; What for?

Question

Having looked at the recent Google source Maps API downloader , I wonder what the following goal is:

google.maps.Load = function(apiLoad) {
    delete google.maps.Load;
    ...

Why do you need the deleteproperty of an object, inside its definition? I suspect this may lead to some increase in performance, but I cannot understand how a property can remove itself within its definition.

Answer 1

This means that the API is loaded only once. However, this will not cause a useful error when the function is called a second time, but may throw an exception.

Here is an alternative solution that causes a more useful error.

google.maps.Load = function() { throw new Error("Already loaded") };

Answer 2

, , .

, Load , .

, V8 ( ) " " ( ).

google.maps.Load = function() {};

google.maps.Load = function() { throw new Error("Already loaded") };

@Sam .

:

• v8

Answer 3

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