discord js how to make a simple currency system in discord js

1//listen i'm not very good at this but at least it works
2//also if you reset the bot the currency will be reseted
3
4client.on('message' , message => {
5	if(message.content === '!add'){
6    	const User = message.author //we are using message.author for the id
7		if(!User.currency) User.currency = 0//you can use whatever name for your currency but im just gonna use 'currency'
8      	const currency = User.currency
9		let result = currency + 1 //i'm gonna use 1 for example
10		user.currency = result
11
12		console.log(currency) //you should see your currency in the terminal
13    }
14})