My code only returns if true and does not work if false

JavaScript
1

Tell us what’s happening:

Your code so far

function confirmEnding(str, target) {
 if (str.substring(-(target.length))){
    return true;
  }
    return false;
}
confirmEnding("Bastian", "n");

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/confirm-the-ending

2

str.substring(-(target.length)
What are you comparing? target.length is just a number.