What is the method for executing a function enclosed within a variable?

Question

What is the method for executing a function enclosed within a variable?

As someone new to the world of Java, I have encountered a puzzling issue with some code related to a game. Specifically, there seems to be an obstacle when it comes to utilizing the navigator function. When I click on this function in the game, some sort of (ajax?) process occurs and it gets logged. However, when attempting to send a message through my FireBug console using the functions above the return line, I seem to encounter difficulty.

The crux of the problem lies in the fact that only the functions returned at the bottom are displayed when invoking ThisFunction.*. How can one effectively invoke the Navigator function? I have made attempts such as: ThisFunction.a.navigator(args here); Unfortunately, I receive an error stating that 'a' is undefined. Moreover, 'a' does not appear in the autocomplete list either.

** Regrettably, I have omitted the specific code due to its connection to the game. Any assistance or suggestions would be greatly appreciated! **

javascript ajax debugging firebug

Answer 1

Answer №1

You hit the nail on the head with this point:

The only functions that ThisFunction.* displays are the ones returned at the bottom

This is the intended and functional aspect of the language.

In short: You need to return anything out of the closure that you want to be accessible externally... Whether it's a variable or an API that can access the variable while keeping it private from external sources. This concept is known as lexical scoping and it can be very useful.

Here's an example:

var ThisFunction = (function() {
  var a = { navigator: "woot" };
  var b = function() {
    return a;
  }
});
ThisFunction.a; //a is null/undefined when returned
ThisFunction.b; //b is defined 
var aOUTSIDE = ThisFunction.b();
aOUTSIDE.navigator; // "woot"

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Closures

So, only elements within the same scope as A can access it. You either need to return A out of the scope or create an API inside the scope to access A's internals.

Answer 2

You hit the nail on the head with this point:

The only functions that ThisFunction.* displays are the ones returned at the bottom

This is the intended and functional aspect of the language.

In short: You need to return anything out of the closure that you want to be accessible externally... Whether it's a variable or an API that can access the variable while keeping it private from external sources. This concept is known as lexical scoping and it can be very useful.

Here's an example:

var ThisFunction = (function() {
  var a = { navigator: "woot" };
  var b = function() {
    return a;
  }
});
ThisFunction.a; //a is null/undefined when returned
ThisFunction.b; //b is defined 
var aOUTSIDE = ThisFunction.b();
aOUTSIDE.navigator; // "woot"

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Closures

So, only elements within the same scope as A can access it. You either need to return A out of the scope or create an API inside the scope to access A's internals.

Answer 3

Answer №2

If OTHERFUNCTIONSHERE holds the key, you can tap into it from inside those functions as long as they encompass the variable a. If not, it's beyond reach due to scoping limitations.

Answer 4

If OTHERFUNCTIONSHERE holds the key, you can tap into it from inside those functions as long as they encompass the variable a. If not, it's beyond reach due to scoping limitations.

Answer 5

Answer №3

When utilizing Firebug, the syntax

ThisFunction.%a.navigator(... args)

should function correctly (.% is a specialized extension in Firebug). However, as mentioned in previous responses, achieving this using pure JavaScript is not feasible.

Answer 6

When utilizing Firebug, the syntax

ThisFunction.%a.navigator(... args)

should function correctly (.% is a specialized extension in Firebug). However, as mentioned in previous responses, achieving this using pure JavaScript is not feasible.

What is the method for executing a function enclosed within a variable?

Answer №1

Answer №2

Answer №3

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