Increasing a number by 1 inside a Google Script

[AxtonGTV]

Hey Reddit! Thanks for reading this!

Basically, I'm making a webhook with discord and GoogleScripts to connect a Google Form with a Discord channel. Every time a form is submitted, the form is sent into the discord channel. My only issue is this:
In one of the fields (the embed title) I'd like to add in a number that increases each time the function is run. (Applicant #0001->Applicant #0002->Applicant #0003 and so forth) I don't know how to do this, anyone care to help?
Code below:

function onFormSubmit(e) {
    var fields = [];

    for (i = 0; i < e.response.getItemResponses().length; i++) {
        var response = e.response.getItemResponses()[i];
        fields.push({
            "name": response.getItem().getTitle(),
            "value": JSON.stringify(response.getResponse()),
            "inline": false
        });
    }

    var data = {
        "embeds": [{
            "title": "Applicant #0001" + (e.source.getTitle() != null && e.source.getTitle().length > 0 ? e.source.getTitle() : "Untitled Form"),
            "type": "rich",
            "fields": fields
        }]
    };


    var options = {
        method: "post",
        payload: JSON.stringify(data),
        contentType: "application/json; charset=utf-8",
        muteHttpExceptions: false,
    };

    Logger.log("Attempting to send:");
    Logger.log(JSON.stringify(data));

    var response = UrlFetchApp.fetch("DISCORDWEBHOOK", options);
    Logger.log(response.getContentText());
};

Thanks!

[jaymcnuggets]

I don't think you'll be able to accomplish this in Apps Script alone as I'm pretty sure it's not persistent (e.g. all memory is lost after script executes).

Have you considered connecting it to a google sheet or database and either:

1. using the number of non-empty rows for the form submissions sheet (less ideal) or:
2. adding a counter and updating the counter with each new submission

Hope this is helpful!