How to make a javascript section repeat if an alert is canceled?

Question

Apologies if this is a silly question, I'm really new to coding. I have a script that I'm currently running through Photoshop on a Mac, which sorts through images in a folder and saves them to one of several other folders. It works fine, but I have to manually type in the filepaths and re-save the script each time, which is a nuisance.

Instead I want to prompt for the folders at the start, and then give the option to confirm the selection, or start again. The folder prompts are working, but I have no idea how to make the script repeat if the user presses the cancel button.

I've tried searching online for answers, but since I don't really know what I'm looking for I'm not getting very far. My best guess is that maybe I need to use an if/else statement targeting the buttons, or a loop that reiterates until the confirm button is pressed.

Here's what I have so far:

var app = Application.currentApplication()
app.includeStandardAdditions = true


var sourceFolder = app.chooseFolder({
    withPrompt: "Please select a source folder:"
})

var pathFolder = app.chooseFolder({
    withPrompt: "Please select an output folder for images with correctly named clipping paths:"
})

var unnamedFolder = app.chooseFolder({
    withPrompt: "Please select an output folder for images with unnamed clipping paths:"
})

var noneFolder = app.chooseFolder({
    withPrompt: "Please select an output folder for images with no clipping paths:"
})


var alertText = "Confirm folder locations?"
var alertMessage = "Originals folder: \n" + sourceFolder + "\n\n" + 
    "Path 1 folder: \n" + pathFolder + "\n\n" + 
    "Unnamed Paths folder: \n" + unnamedFolder + "\n\n" + 
    "No Paths folder: \n" + noneFolder
app.displayAlert(alertText, {
    message: alertMessage,
    buttons: ["Change", "Confirm"],
    defaultButton: "Confirm",
    cancelButton: "Change"
})

If the "Confirm" button is pressed I want the script to continue on to the next section where it will start sorting the images into the chosen folders. If "Change" is pressed, I want this section of code to start again. How can I make this happen?

Answer 1

I think I may have figured it out (thanks Medet Tleukabiluly for mentioning functions, it gave me a new line of exploration):

var app = Application.currentApplication()
app.includeStandardAdditions = true

var sourceFolder
var pathFolder
var unnamedFolder
var noneFolder

function selectFolders() {
    sourceFolder = app.chooseFolder({
        withPrompt: "Please select a source folder:"
    })
    pathFolder = app.chooseFolder({
        withPrompt: "Please select an output folder for images with correctly named clipping paths:"
    })
    unnamedFolder = app.chooseFolder({
        withPrompt: "Please select an output folder for images with unnamed clipping paths:"
    })
    noneFolder = app.chooseFolder({
        withPrompt: "Please select an output folder for images with no clipping paths:"
    })

    var alertText = "Confirm folder locations?"
    var alertMessage = "Originals folder: \n" + sourceFolder + "\n\n" + 
        "Path 1 folder: \n" + pathFolder + "\n\n" + 
        "Unnamed Paths folder: \n" + unnamedFolder + "\n\n" + 
        "No Paths folder: \n" + noneFolder
    var x = app.displayAlert(alertText, {
        message: alertMessage,
        buttons: ["Change", "Confirm"],
        defaultButton: "Confirm",
    })

    if (x.buttonReturned === "Change") {
        selectFolders()
    }   
}

selectFolders()

app.displayDialog("Confirmed")

Not sure if I've done it in the best way possible, but this seems to work - it now repeats the selectFolders function until "Confirm" is pressed, then continues through the script.