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Oct 18th, 2019
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  1. const Discord = require('discord.js')
  2. const client = new Discord.Client()
  3.  
  4. client.on('message', (receivedMessage) => {
  5. if (receivedMessage.author == client.user) { // Prevent bot from responding to its own messages
  6. return
  7. }
  8.  
  9. if (receivedMessage.content.startsWith("!")) {
  10. processCommand(receivedMessage)
  11. }
  12. })
  13.  
  14. function processCommand(receivedMessage) {
  15. let fullCommand = receivedMessage.content.substr(1) // Remove the leading exclamation mark
  16. let splitCommand = fullCommand.split(" ") // Split the message up in to pieces for each space
  17. let primaryCommand = splitCommand[0] // The first word directly after the exclamation is the command
  18. let arguments = splitCommand.slice(1) // All other words are arguments/parameters/options for the command
  19.  
  20. console.log("Command received: " + primaryCommand)
  21. console.log("Arguments: " + arguments) // There may not be any arguments
  22.  
  23. if (primaryCommand == "help") {
  24. helpCommand(arguments, receivedMessage)
  25. } else if (primaryCommand == "multiply") {
  26. multiplyCommand(arguments, receivedMessage)
  27. } else {
  28. receivedMessage.channel.send("I don't understand the command. Try `!help` or `!multiply`")
  29. }
  30. }
  31.  
  32. function helpCommand(arguments, receivedMessage) {
  33. if (arguments.length > 0) {
  34. receivedMessage.channel.send("It looks like you might need help with " + arguments)
  35. } else {
  36. receivedMessage.channel.send("I'm not sure what you need help with. Try `!help [topic]`")
  37. }
  38. }
  39.  
  40. function multiplyCommand(arguments, receivedMessage) {
  41. if (arguments.length < 2) {
  42. receivedMessage.channel.send("Not enough values to multiply. Try `!multiply 2 4 10` or `!multiply 5.2 7`")
  43. return
  44. }
  45. let product = 1
  46. arguments.forEach((value) => {
  47. product = product * parseFloat(value)
  48. })
  49. receivedMessage.channel.send("The product of " + arguments + " multiplied together is: " + product.toString())
  50. }
  51.  
  52. client.login("token")
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