longest string javascript code example

Example 1: Convert longest string in array

const findLongest = words => Math.max(...(words.map(el => el.length)));

// Example
findLongest(['always','look','on','the','bright','side','of','life']);  // 6

Example 2: js find longest word in string function

function findLongestWordLength(str) {
  return Math.max(...str.split(' ').map(word => word.length));
}