Arguments for Discord.js - discord.js

Question

how do I read args in discord.js? I am trying to create a support bot and I want to have an !help {topic} command. how do I do that?
my current code is very basic
const Discord = require('discord.js');
const client = new Discord.Client();
const prefix = ("!")
const token = ("removed")
client.on('ready', () => {
console.log(`Logged in as ${client.user.tag}!`);
});
client.on('message', msg => {
if (msg.content === 'ping') {
msg.reply('pong');
}
if (msg.content === 'help') {
msg.reply('type -new to create a support ticket');
}
});
client.login(token);

Answer 1

You can make use of a prefix and arguments like so...
const prefix = '!'; // just an example, change to whatever you want
client.on('message', message => {
if (!message.content.startsWith(prefix)) return;
const args = message.content.trim().split(/ +/g);
const cmd = args[0].slice(prefix.length).toLowerCase(); // case INsensitive, without prefix
if (cmd === 'ping') message.reply('pong');
if (cmd === 'help') {
if (!args[1]) return message.reply('Please specify a topic.');
if (args[2]) return message.reply('Too many arguments.');
// command code
}
});

Answer 2

you can use Switch statement instead of
if (command == 'help') {} else if (command == 'ping') {}
client.on ('message', async message => {
var prefix = "!";
var command = message.content.slice (prefix.length).split (" ")[0],
topic = message.content.split (" ")[1];
switch (command) {
case "help":
if (!topic) return message.channel.send ('no topic bro');
break;
case "ping":
message.channel.send ('pong!');
break;
}
});

Answer 3

let args = msg.content.split(' ');
let command = args.shift().toLowerCase();
this is the simplified answer from #slothiful.
usage
if(command == 'example'){
if(args[0] == '1'){
console.log('1');
} else {
console.log('2');

Answer 4

You can create a simple command/arguments thing (I don't know how to word it correctly)
client.on("message", message => {
let msgArray = message.content.split(" "); // Splits the message content with space as a delimiter
let prefix = "your prefix here";
let command = msgArray[0].replace(prefix, ""); // Gets the first element of msgArray and removes the prefix
let args = msgArray.slice(1); // Remove the first element of msgArray/command and this basically returns the arguments
// Now here is where you can create your commands
if(command === "help") {
if(!args[0]) return message.channel.send("Please specify a topic.");
if(args[1]) return message.channel.send("Too many arguments.");
// do your other help command stuff...
}
});

Answer 5

You can do
const args =
message.content.slice(prefix.length).trim().split(' ');
const cmd = args.shift().toLocaleLowerCase();

Answer 6

Word of advice, use a command handler and slash commands - this will solve both the need for a help command and reading arguments. Also helps with readability.
Anyways...
message.content.split(' '): This will split your string into an array of sub-strings, then return a new array.
.shift(): This will remove the first index in the array.
Combining this will get you your arguments: const args = message.content.split(' ').shift()