Take a command sent and split it into multiple variables with JavaScript

I would probably do something like this:

Let's pretend the message.content looks like this: "?setnick 0123 testName"

// first, store message content into small variable (to keep things clean later)
let msg = message.content;

// now pull out the command arguments - everything after the first space in message.content
let argString = msg.substr( msg.indexOf(' ') + 1 );

// argString should be "0123 testName"
// -> now split argString into pieces (id and new nickname)
let argArr = argString.split(' ');

// argArr should be ["0123", "testName"]
// -> now store each argument into its own new variable
let [uid, newNickname] = argArr;

Now you have two variables, uid = "0123" and newNickname = "testName" which you can use.

You probably also want to do add some validation on your argArr variable - so if the user adds extra text in the argument, you can either throw an error or add the extra data as the nickname (as examples).

Hope this helps!

After you split the message, you'll have an array with all the parts.

var message = " part1 part2 part3";
var array = message.substring(1).split(' ');
// array = ["part1", "part2", "part3"]

You can access these by using the array's indexes:

var part1 = array[0];
// part1 = "part1"

Or you can use forEach to do something with each part:

array.forEach(x => console.log(x));
// part1
// part2
// part3