You can use Math.random
for another random number between 0.0 and 1.0 and use it to determine whether to add or subtract
let money = Math.floor(Math.random() * 80) + 1;
let shouldAdd = Math.random() >= 0.5;
let user = `money_${msg.guild.id}_${user.id}`;
if (shouldAdd) {
db.add(user, money);
} else {
db.subtract(user, money);
}
If you want to add
90% and subtract
only 10% of the time then you can use shouldAdd = Math.random() >= 0.1;
or tweak it however you want
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