CODE EXAMPLE FOR JAVASCRIPT

javascript find the longest word in a string

let str = 'Sleep is critical for good health. Not getting enough sleep can lead 
to diminished brain performance and, in the long term, greater risk of 
health conditions. These include heart disease, stroke, and diabetes';

function findWordsByLen(str, len) {
  const punctuationReg = /[.:;,?!"`~[]{}()<>/@#$%^&*=+_-]/g;
  const words = str
	.replaceAll(/s{2,}/g, ' ')
	.replaceAll(punctuationReg, '')
	.split(' ');

  let wordsByLen = words.reduce((acc, word) => {
    let wordLen = word.length;
    if (!acc.has(wordLen)) acc.set(wordLen, new Set());
    acc.get(wordLen).add(word);
    return acc;
  }, new Map());

  const maxLen = Math.max(...wordsByLen.keys());
  const minLen = Math.min(...wordsByLen.keys());

  switch(len) {
  case 'all':
    return wordsByLen;
  case 'max':
    return wordsByLen.get(maxLen);
  case 'min':
    return wordsByLen.get(minLen);
  }

  if (Number.isInteger(len) && wordsByLen.has(len)) return wordsByLen.get(len)
  else return `The string doesn't have any words with a length of ${len}`

}

findWordsByLen(str, 'max');     // => Set(1) { 'performance' }
findWordsByLen(str, 'min');     // => Set(4) { 'is', 'to', 'in', 'of' }
findWordsByLen(str, 8);         // => Set(2) { 'critical', 'diabetes' }


findWordsByLen(str, 'all');
/* OUTPUT:
Map(9) {
  5 => Set(5) { 'Sleep', 'sleep', 'brain', 'These', 'heart' },
  2 => Set(4) { 'is', 'to', 'in', 'of' },
  8 => Set(2) { 'critical', 'diabetes' },
  3 => Set(5) { 'for', 'Not', 'can', 'and', 'the' },
  4 => Set(5) { 'good', 'lead', 'long', 'term', 'risk' },
  6 => Set(3) { 'health', 'enough', 'stroke' },
  7 => Set(4) { 'getting', 'greater', 'include', 'disease' },
  10 => Set(2) { 'diminished', 'conditions' },
  11 => Set(1) { 'performance' }
}
*/