Yes, it's possible to have "inputs" in a message or command.
To do so, you'll have to learn about regex.
Here's an example:
//Act on chat messages & commands
client.on('friendMessage', (steamID, message) => {
//Command place holder
var cmd;
//Does the message match our buy command
if(cmd = message.match(/^!buy (\d+) (\D+)/i)) {
//The amount to buy (input string to number)
var amount = Number(cmd[1]);
//The item to buy (input string)
var item = cmd[2];
//Log the regex values
console.log(`User ${steamID} would like to purchase ${amount} of ${item}`);
//Call your function that takes these two values as arguments.
sellItem(steamID, amount, item);
}
});
In the example above we're looking for a buy command match. The string has to start with !buy, contain a number & a set of characters. For numbers only we use 'd' & for characters we use 'D'. The number is the amount of an item to buy, while the charaters is the item's name. We can access these values by using the following notation cmd[1]. Here 1 is the first regex match & cmd[2] is the second one.
The (), \ & + all have different uses, escpeially when it comes to matching something from a string using regex. You can read more about those used in the example above here.
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