RMMV Is there a way for changing a function already implemented saving its original content?

[JessIchigoShadow]

For example, I want to call the item window but with only the "items" section. Is there a way to save the Window_CommandList.prototype.makeCommandList function and changing it? Like, I want to have the items only when I specifically call for that type of scene but otherwise the standard one

 

[Jragyn]

Though the entirety of the post isn't necessarily relevant to what you ask for, the general idea of "aliasing a function", which is what I believe you're asking for, is described in one of the top posts in this section of the forum. For your convenience, here's a link:

Write a Plugin that reads Notetags - Beginner

Write a Plugin that reads Notetags - Beginner Happy Tutorial Tuesday! This tutorial will teach you how to read an actor's "race" (like Human, Goblin, Dwarf) from their notetag in the database, and display it in the Status Menu. What should you know before getting started? This is a beginner...

forums.rpgmakerweb.com

The main post itself is where the information exists, around step 3 or something.

 

[TheoAllen]

Yes, you can change the function on the fly for a specific object only you created, for example

const cmdWindow = new Window_CommandList()
cmdWindow.makeCommandList = function() {
   // ...
}

 

[JessIchigoShadow]

Yes, you can change the function on the fly for a specific object only you created, for example

const cmdWindow = new Window_CommandList()
cmdWindow.makeCommandList = function() {
   // ...
}

Nice!
But now I have a new problem
I implemented a new Scene calling the cmdWindow, and when I call it with SceneManager.push(Negozio) //the name of the new Scene, nothing appears on the screen, the protagonist can't move and it returns an error only when you load the game in the console, "Cannot read property term of undefined"

 

[Jragyn]

Nice!
But now I have a new problem
I implemented a new Scene calling the cmdWindow, and when I call it with SceneManager.push(Negozio) //the name of the new Scene, nothing appears on the screen, the protagonist can't move and it returns an error only when you load the game in the console, "Cannot read property term of undefined"

It would be difficult to troubleshoot further without actually seeing the surrounding code and all that, as what is provided above is a rough example of the pattern, not necessarily what you specifically should probably be doing.