Convert the characters &, <, >, " (double quote), and ' (apostrophe), in a string to their corresponding HTML entities.

convert-html-entities.js

function convertHTML(str) {
  // :)
  //create an object to store the html conversions
  var htmlEntities = {
    '&' : '&',
    '<' : '&lt;',
    '>' : '&gt;',
    '"' : '&quot;',
    "'" : '&apos;'
  };
  //function takes the match and finds the related conversion from the object
  function convertHTML(match){
    return htmlEntities[match];
  }
  //regex = match any one of the characters in the square brackets
  return str.replace(/[&<>"']/g, convertHTML);
}

convertHTML("Dolce & Gabbana");