#2129 - Capitalize the Title

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Problem Description

You are given a string title consisting of one or more words separated by a single space, where each word consists of English letters. Capitalize the string by changing the capitalization of each word such that:

If the length of the word is 1 or 2 letters, change all letters to lowercase.
Otherwise, change the first letter to uppercase and the remaining letters to lowercase.

Return the capitalized title.

Solution

/**
 * @param {string} title
 * @return {string}
 */
var capitalizeTitle = function(title) {
  return title.split(/\s+/).map(word => {
    return word.toLowerCase().replace(/^\w/, l => word.length > 2 ? l.toUpperCase() : l);
  }).join(' ');
};