How to use startsWith in node.js?

Question

let botmod = staff.get(`${message.author.id}`)
  if (botmod.startsWith !== "Bot")
    return message.channel.send("Unfortunately, you are a server mod. You can't use bot commands.")

The above is an example of me trying to use .startsWith() . However, I don't think I am using it correctly.
It triggers that message, even if the message does have Bot in it.
There are no errors logged in the console.

Answer 1

startsWith is a function, you pass the value you want to check and it will return a boolean , so

if (botmod.startsWith("Bot")) 
  ...
} 

Answer 2

It is a function:
If you want the string to start with Bot,

if(botmod.startsWith("Bot")){
  // ...do stuff
}

or If you don't want the string to start with Bot,

if(!botmod.startsWith("Bot")){
  // ...do stuff
}

However, you can only run .startsWith() on Strings.

Answer 3

startsWith returns a boolean. So you want

const foo = 'bar';

if(foo.startsWith('thing')) {
   // do stuff
}