Capitalize first character of each word

JadenCasingStrings.js

// Adapted from : https://www.codewars.com/kata/5390bac347d09b7da40006f6/train/javascript 

String.prototype.toJadenCase = function () {
  let str = this.toString();
  // split it to an array, 
  //   capitalize each item
  // join it with a space
  str = str.split(' ');
  return str.map(word => word.charAt(0).toUpperCase()+ word.slice(1)).join(' ');
  
  
};