freeCodeCamp Intermediate Algorithm Scripting: Convert HTML Entities

convertHTML.js

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

function convertHTML(str) {
  // &colon;&rpar;
  const convertHTML={ "&": "&amp;",
                      "<": "&lt;",
                      ">": "&gt;",
                      "\"": "&quot;",
                      "'": "&apos;"}
  return str.split("").map(letter => { return [
        letter.match(/[&<>"']/) ? convertHTML[letter] : letter]
      }).join("");
}

convertHTML("Dolce & Gabbana"); // Dolce &​amp; Gabbana
convertHTML("Hamburgers < Pizza < Tacos"); // Hamburgers &​lt; Pizza &​lt; Tacos
convertHTML("Sixty > twelve"); // Sixty &​gt; twelve
convertHTML('Stuff in "quotation marks"'); // Stuff in &​quot;quotation marks&​quot;
convertHTML("Schindler's List"); // Schindler&​apos;s List
convertHTML("<>"); // &​lt;&​gt;
convertHTML("abc"); // abc