<h3>O'zgaruvchilar</h3>
<ul>
<li><code>let</code> — o'zgartirish mumkin (blok scope)</li>
<li><code>const</code> — o'zgarmas qiymat</li>
<li><code>var</code> — eski usul (ishlatmang)</li>
</ul>
<h4>Ma'lumot turlari:</h4>
<ul>
<li><strong>String:</strong> "matn" yoki 'matn'</li>
<li><strong>Number:</strong> 42, 3.14</li>
<li><strong>Boolean:</strong> true, false</li>
<li><strong>Array:</strong> [1, 2, 3]</li>
<li><strong>Object:</strong> {nom: "Ali", yosh: 20}</li>
<li><strong>undefined, null</strong></li>
</ul>