DiscordJS v12 args[0].isInteger is not a function

Question

    if (!args[0])
      return message.channel.send(`<:warning:943421375526355024> | **Please Give Me Amounts Of Messages!**`);

    if (isNaN(args[0]))
      return message.channel.send(`<:warning:943421375526355024> | **Please Give Me Number Value!**`);

    if (!isInteger(args[0]))
    return message.channel.send(`<:warning:943421375526355024> | **Please Provide A Whole Number**`);


    if (args[0] > 100)
      return message.channel.send(
        `<:warning:943421375526355024> | **I Can't Delete ${args[0]} Messages Because Of Discord Limit!**`
      );
    if (args[0] > 0) message.channel.bulkDelete(args[0], true).then(Message => {
      return message.channel.send(`<:check:947079937372872704> | **Cleared ${Message.size} messages!**`).then(Message => {
        setTimeout(function () {
          Message.delete()
            .catch()
        }, 2000)
      }
      )
    })
  }
}

Error:

if (!isInteger(args[0]))
     ^ 
    ReferenceError: isInteger is not defined

I am trying to stop the bot from crashing when inputting decimal numbers with my purge command.

I have tried this:

if (!isInteger(args[0]))
  return message.channel.send(<:warning:943421375526355024> | `**`Please Provide A Whole Number`**`);

but it returns the error above. How would I make it work?

Answer 1

It should be Number.isInteger(), but it will always return false as args[0] is a string. You can convert it to a number and do those validations:

if (!args[0])
  return message.channel.send(
    `<:warning:943421375526355024> | **Please Give Me Amounts Of Messages!**`,
  );

let amount = Number(args[0]);

if (isNaN(amount))
  return message.channel.send(
    `<:warning:943421375526355024> | **Please Give Me Number Value!**`,
  );

if (!Number.isInteger(amount))
  return message.channel.send(
    `<:warning:943421375526355024> | **Please Provide A Whole Number**`,
  );

if (amount > 100)
  return message.channel.send(
    `<:warning:943421375526355024> | **I Can't Delete ${amount} Messages Because Of Discord Limit!**`,
  );

if (amount > 0)
  message.channel.bulkDelete(amount, true).then((Message) => {
    return message.channel
      .send(
        `<:check:947079937372872704> | **Cleared ${Message.size} messages!**`,
      )
      .then((Message) => {
        setTimeout(function () { Message.delete().catch(); }, 2000);
      });
  });