为什么我收到一个错误说拆分未定义？

Question

var anssep = answer.split(" ")
var answer = (" ")
if(anssep[0] == "send"){
  var toSend = answer.replace((anssep[0]+" "), "")
  bot.channels.cache.get("701888561640636510").send(toSend)

that is the code that should take what i type into console and print it on the discord server for this bot but i get this error

TypeError: Cannot read property 'split' of undefined

Answer 1

You are trying to use split in a string called answer which has not been declared and defined yet. Swap lines 1 and 2 according to:

var answer = (" ")
var anssep = answer.split(" ")

Answer 2

That error usually means you are trying to call a method of something undefined. In your case, it probably means the variable called answer is undefined but there's no way to be sure without knowing how that variable gets created.

Did you try debug the javascript source from a browser? You can stop in that point and see if your variable has a value or not.

Answer 3

First establish that it is not undefined then ensure it is a string:

if(answer !== undefined){
  var anssep = answer.toString().split(" ")
} else {
 console.log('answer is undefined')
}