Cannot read property 'includes' of undefined

Question

I am new to JavaScript, am I was trying to dissect an embedded message. Here\'s my code, it runs fine for a few mins, works accordingly but idk what goes wrong.

Answer 1

JavaScript is not a type safe language, and the error is caused by not being type safe. We will have to check if object exists and nested properties exists and after we should be able check the value. In your case:

bot.on('message', (message) => {

  // check if main obj and main property exist
  if (message && message.embeds) {

    for (var i = 0; i < message.embeds.length; i++) {
      // now, check if title exists and after check the text inside
      if (
        message.embeds[i].title && 
        message.embeds[i].title.includes("text!")) 
      {
        message.channel.send('reply')
      }
    }

  }
});