Howdy and welcome to the forum!
When posting your code, please be sure it is properly formatted. You can learn how to do this here: [Essentials] How To Post/Format Your Code Correctly
It appears that you are using CoffeeScript. Just be aware that CS is experimental and may not be fully supported on every level.
Anyway, your array, ‘enemyNames = {“Kog”, “Godel”, “Vorobun”, “Rexxar”}’, has 4 elements, but don’t forget that most things in programming always start at zero [0].