sectom/functions/casing.js

Sectom is a useful npm package that has multiple easy to use functions.

/**
 * Changes the first letter of every word in a string from lowercase to uppercase
 * @param {string} s
 * @example
 * propercase("hello my name is") // Hello My Name Is
 * @returns {string}
 */

function propercase(str) {
  if (Array.isArray(str))
    throw new TypeError(`"str" must be a string and not an array!`);
  var splitStr = str.toLowerCase().split(" ");
  for (var i = 0; i < splitStr.length; i++) {
    // You do not need to check if i is larger than splitStr length, as your for does that for you
    // Assign it back to the array
    splitStr[i] =
      splitStr[i].charAt(0).toUpperCase() + splitStr[i].substring(1);
  }
  // Directly return the joined string
  return splitStr.join(" ");
}

/**
 * Changes the first letter of a single string from lowercase to uppercase
 * @param {string} s
 * @example
 * capitalize("hello") // Hello
 * capitalize("HELLO") // HELLO
 * capitalize("HELLO") // HELLO
 * @returns {string}
 */
function capitalize(s) {
  if (typeof s !== "string") return "";
  return s.charAt(0).toUpperCase() + s.slice(1);
}

exports.capitalize = capitalize;

exports.propercase = propercase;