Currency is not defined [closed] - discord

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I decided to use this discord.js guide to create my economy discord bot. Apparently something went wrong as I was about to run the bot. It had this error message and it said :
Reflect.defineProperty(currency, 'add', {
^
ReferenceError: currency is not defined
I have no idea what was wrong with it. Here's my index.js:
const Discord = require('discord.js');
const { prefix, token } = require('./config.json');
const client = new Discord.Client();
Reflect.defineProperty(currency, 'add', {
/* eslint-disable-next-line func-name-matching */
value: async function add(id, amount) {
const user = currency.get(id);
if (user) {
user.balance += Number(amount);
return user.save();
}
const newUser = await Users.create({ user_id: id, balance: amount });
currency.set(id, newUser);
return newUser;
},
});
Reflect.defineProperty(currency, 'getBalance', {
/* eslint-disable-next-line func-name-matching */
value: function getBalance(id) {
const user = currency.get(id);
return user ? user.balance : 0;
},
});
client.once('ready', () => {
console.log('Ready!');
});
});
client.on('message', async message => {
if (message.author.bot) return;
currency.add(message.author.id, 1);
if (!message.content.startsWith(PREFIX)) return;
const input = message.content.slice(PREFIX.length).trim();
if (!input.length) return;
const [, command, commandArgs] = input.match(/(\w+)\s*([\s\S]*)/);
if (command === 'balance') {
const target = message.mentions.users.first() || message.author;
return message.channel.send(`${target.tag} has ${currency.getBalance(target.id)}💰`);
} else if (command === 'inventory') {
const target = message.mentions.users.first() || message.author;
const user = await Users.findOne({ where: { user_id: target.id } });
const items = await user.getItems();
if (!items.length) return message.channel.send(`${target.tag} has nothing!`);
return message.channel.send(`${target.tag} currently has ${items.map(t => `${t.amount} ${t.item.name}`).join(', ')}`);
} else if (command === 'transfer') {
const currentAmount = currency.getBalance(message.author.id);
const transferAmount = commandArgs.split(/ +/).find(arg => !/<#!?\d+>/.test(arg));
const transferTarget = message.mentions.users.first();
if (!transferAmount || isNaN(transferAmount)) return message.channel.send(`Sorry ${message.author}, that's an invalid amount`);
if (transferAmount > currentAmount) return message.channel.send(`Sorry ${message.author} you don't have that much.`);
if (transferAmount <= 0) return message.channel.send(`Please enter an amount greater than zero, ${message.author}`);
currency.add(message.author.id, -transferAmount);
currency.add(transferTarget.id, transferAmount);
return message.channel.send(`Successfully transferred ${transferAmount}💰 to ${transferTarget.tag}. Your current balance is ${currency.getBalance(message.author.id)}💰`);
} else if (command === 'buy') {
const item = await CurrencyShop.findOne({ where: { name: { [Op.like]: commandArgs } } });
if (!item) return message.channel.send('That item doesn\'t exist.');
if (item.cost > currency.getBalance(message.author.id)) {
return message.channel.send(`You don't have enough currency, ${message.author}`);
}
const user = await Users.findOne({ where: { user_id: message.author.id } });
currency.add(message.author.id, -item.cost);
await user.addItem(item);
message.channel.send(`You've bought a ${item.name}`);
} else if (command === 'shop') {
const items = await CurrencyShop.findAll();
return message.channel.send(items.map(i => `${i.name}: ${i.cost}💰`).join('\n'), { code: true });
} else if (command === 'leaderboard') {
return message.channel.send(
currency.sort((a, b) => b.balance - a.balance)
.filter(user => client.users.cache.has(user.user_id))
.first(10)
.map((user, position) => `(${position + 1}) ${(client.users.cache.get(user.user_id).tag)}: ${user.balance}💰`)
.join('\n'),
{ code: true }
);
}
});
client.login(`[TOKEN]`);
I presume the only probelm of this code is Reflect.defineProperty(currency, 'add', { as it can't define what is currency. I hope someone can help...

Answer 1

You're attempting to use the currency variable but you haven't defined it so JavaScript is rightfully complaining because it doesn't know what currency is.
The following line from the guide is missing from your code:
const currency = new Discord.Collection();

Answer 2

You have to define currency.
Basic js-