freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.english.md

id, title, isRequired, challengeType

id	title	isRequired	challengeType
a6b0bb188d873cb2c8729495	Convert HTML Entities	true	5

Description

Convert the characters &, <, >, " (double quote), and ' (apostrophe), in a string to their corresponding HTML entities. Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Instructions

Tests

tests:
  - text: <code>convertHTML("Dolce & Gabbana")</code> should return <code>Dolce &amp; Gabbana</code>.
    testString: assert.match(convertHTML("Dolce & Gabbana"), /Dolce &amp; Gabbana/, '<code>convertHTML("Dolce & Gabbana")</code> should return <code>Dolce &amp; Gabbana</code>.');
  - text: <code>convertHTML("Hamburgers < Pizza < Tacos")</code> should return <code>Hamburgers &lt; Pizza &lt; Tacos</code>.
    testString: assert.match(convertHTML("Hamburgers < Pizza < Tacos"), /Hamburgers &lt; Pizza &lt; Tacos/, '<code>convertHTML("Hamburgers < Pizza < Tacos")</code> should return <code>Hamburgers &lt; Pizza &lt; Tacos</code>.');
  - text: <code>convertHTML("Sixty > twelve")</code> should return <code>Sixty &gt; twelve</code>.
    testString: assert.match(convertHTML("Sixty > twelve"), /Sixty &gt; twelve/, '<code>convertHTML("Sixty > twelve")</code> should return <code>Sixty &gt; twelve</code>.');
  - text: <code>convertHTML(&apos;Stuff in "quotation marks"&apos;)</code> should return <code>Stuff in &quot;quotation marks&quot;</code>.
    testString: assert.match(convertHTML('Stuff in "quotation marks"'), /Stuff in &quot;quotation marks&quot;/, '<code>convertHTML(&apos;Stuff in "quotation marks"&apos;)</code> should return <code>Stuff in &quot;quotation marks&quot;</code>.');
  - text: <code>convertHTML("Schindler&apos;s List")</code> should return <code>Schindler&apos;s List</code>.
    testString: assert.match(convertHTML("Schindler's List"), /Schindler&apos;s List/, '<code>convertHTML("Schindler&apos;s List")</code> should return <code>Schindler&apos;s List</code>.');
  - text: <code>convertHTML("<>")</code> should return <code>&lt;&gt;</code>.
    testString: assert.match(convertHTML('<>'), /&lt;&gt;/, '<code>convertHTML("<>")</code> should return <code>&lt;&gt;</code>.');
  - text: <code>convertHTML("abc")</code> should return <code>abc</code>.
    testString: assert.strictEqual(convertHTML('abc'), 'abc', '<code>convertHTML("abc")</code> should return <code>abc</code>.');

Challenge Seed

function convertHTML(str) {
  // :)
  return str;
}

convertHTML("Dolce & Gabbana");

Solution

var MAP = { '&': '&',
            '<': '&lt;',
            '>': '&gt;',
            '"': '&quot;',
            "'": '&apos;'};

function convertHTML(str) {
  return str.replace(/[&<>"']/g, function(c) {
    return MAP[c];
  });
}