Finding a simple solution for storing a single variable

[nimalqua]

Hi all, 

I'm creating a simple counting app to keep track of the number of food cravings I've experienced in a day.

I've got it all working except the storage.

I'm looking for a simple way to save the value of a single variable, so it persists between app log-ins and log outs. 

Has anyone a short tutorial or example of how to do this using json? 

_________________

let cravings_logged = stored.value;

let number;

(if cravings_logged has a stored value) {

number = cravings_logged

} else {

number = 0;

}

I tap on a button and, each time I do,

number = number +1

.....

and when I go to log out I want to write to memory...

stored.value = number

...

any advice on how to do this? 

[nimalqua · Accepted solution]

Fixed it! Kept getting an error thrown, so resolved it using this code - 

var old_data;

try {

old_data = fs.readFileSync("cbor.txt", "cbor");

} catch(e) {
console.log("oh snap we have an:", e);
let new_data;
new_data = {
"cravings_now": 0
};

fs.writeFileSync("cbor.txt", new_data, "cbor")

}