--description--

Given a string containing one or more words, return an acronym of the words using the following constraints:

• The acronym should consist of the first letter of each word capitalized, unless otherwise noted.
• The acronym should ignore the first letter of these words unless they are the first word of the given string: a, for, an, and, by, and of.
• The acronym letters should be returned in the order they are given.
• The acronym should not contain any spaces.

--hints--

buildAcronym("Search Engine Optimization") should return "SEO".

assert.equal(buildAcronym("Search Engine Optimization"), "SEO");

buildAcronym("Frequently Asked Questions") should return "FAQ".

assert.equal(buildAcronym("Frequently Asked Questions"), "FAQ");

buildAcronym("National Aeronautics and Space Administration") should return "NASA".

assert.equal(buildAcronym("National Aeronautics and Space Administration"), "NASA");

buildAcronym("Federal Bureau of Investigation") should return "FBI".

assert.equal(buildAcronym("Federal Bureau of Investigation"), "FBI");

buildAcronym("For your information") should return "FYI".

assert.equal(buildAcronym("Light Amplification by Stimulated Emission of Radiation"), "LASER");

buildAcronym("By the way") should return "BTW".

assert.equal(buildAcronym("By the way"), "BTW");

buildAcronym("An unstoppable herd of waddling penguins overtakes the icy mountains and sings happily") should return "AUHWPOTIMSH".

assert.equal(buildAcronym("An unstoppable herd of waddling penguins overtakes the icy mountains and sings happily"), "AUHWPOTIMSH");

--seed--

--seed-contents--

function buildAcronym(str) {

  return str;
}

--solutions--

function buildAcronym(str) {
  const smallWords = ["a", "for", "an", "and", "by", "of"];
  const words = str.split(" ");
  let acronym = "";

  for (let i = 0; i < words.length; i++) {
    const word = words[i];
    const lowerWord = word.toLowerCase();

    if (i === 0 || !smallWords.includes(lowerWord)) {
      acronym += word[0].toUpperCase();
    }
  }

  return acronym;
}