TitleCaseConversion.js

/*
 Problem statement and Explanation : https://www.codeproject.com/Tips/162540/Letter-Case-Conversion-Algorithms-Title-Case-Toggl.
 [Title case](https://en.wikipedia.org/wiki/Title_case) is a style where all words are capitalized. Officially, title case
 does not capitalize some words, such as very short words like "a" or "is", but for the purposes of this function, a general approach
 is taken where all words are capitalized regardless of length.
*/

/**
 * The titleCaseConversion function converts a string into a title case string.
 * @param {string} inputString The input string which can have any types of letter casing.
 * @returns {string} A string that is in title case.
 */
const titleCaseConversion = (inputString) => {
 if (inputString === '') return ''
 // Extract all space separated string.
 const stringCollections = inputString.split(' ').map((word) => {
 let firstChar = ''
 // Get the [ASCII](https://en.wikipedia.org/wiki/ASCII) character code by the use charCodeAt method.
 const firstCharCode = word[0].charCodeAt()
 // If the ASCII character code lies between 97 to 122 it means they are in the lowercase so convert it.
 if (firstCharCode >= 97 && firstCharCode <= 122) {
 // Convert the case by use of the above explanation.
 firstChar += String.fromCharCode(firstCharCode - 32)
 } else {
 // Else store the characters without any modification.
 firstChar += word[0]
 }
 const newWordChar = word
 .slice(1)
 .split('')
 .map((char) => {
 // Get the ASCII character code by the use charCodeAt method.
 const presentCharCode = char.charCodeAt()
 // If the ASCII character code lies between 65 to 90, it means they are in the uppercase so convert it.
 if (presentCharCode >= 65 && presentCharCode <= 90) {
 // Convert the case by use of the above explanation.
 return String.fromCharCode(presentCharCode + 32)
 }
 // Else return the characters without any modification.
 return char
 })
 // Return the first converted character and remaining character string.
 return firstChar + newWordChar.join('')
 })
 // Convert all words in a string and return it.
 return stringCollections.join(' ')
}

export { titleCaseConversion }