Bob's-Short-Forms.js

/*
  Bob is a theoretical coder - he doesn't write code, but comes up with theories, formulas and algorithm ideas. You are his secretary, and he has tasked you with writing the code for his newest project - a method for making the short form of a word. Write a function shortForm(C# ShortForm, Python short_form) that takes a string and returns it converted into short form using the rule: Remove all vowels, except for those that are the first or last letter. Do not count 'y' as a vowel, and ignore case. Also note, the string given will not have any spaces; only one word, and only Roman letters.
  Example:

  shortForm("assault");
  short_form("assault")
  ShortForm("assault");
  // should return "asslt"
*/

// Answer:

function shortForm(str) {
  return str.replace(/(?!^|.$)[aeiou]/gi, "")
}

// BigO: O(n)