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<!DOCTYPE html>
<html>
<head>
    <title>10 JavaScript Utility Functions Every Developer Should Know</title>
    <meta name="description" content="Essential JavaScript utilities for daily development. Copy-paste ready functions.">
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    <style>
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        pre { overflow-x: auto; }
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<body>

<h1>JavaScript Utility Functions</h1>

<h2>1. Debounce</h2>
<div class="snippet">
<pre>
function debounce(func, delay) {
  let timeoutId;
  return (...args) => {
    clearTimeout(timeoutId);
    timeoutId = setTimeout(() => func(...args), delay);
  };
}
</pre>
</div>

<h2>2. Throttle</h2>
<div class="snippet">
<pre>
function throttle(func, limit) {
  let inThrottle;
  return (...args) => {
    if (!inThrottle) {
      func(...args);
      inThrottle = true;
      setTimeout(() => inThrottle = false, limit);
    }
  };
}
</pre>
</div>

<h2>3. Deep Clone</h2>
<div class="snippet">
<pre>
const deepClone = (obj) => JSON.parse(JSON.stringify(obj));
</pre>
</div>

<h2>4. Async Retry</h2>
<div class="snippet">
<pre>
async function retry(fn, retries = 3, delay = 1000) {
  for (let i = 0; i < retries; i++) {
    try {
      return await fn();
    } catch (e) {
      if (i === retries - 1) throw e;
      await new Promise(r => setTimeout(r, delay));
    }
  }
}
</pre>
</div>

<h2>5. Flatten Array</h2>
<div class="snippet">
<pre>
const flatten = (arr) => arr.reduce((acc, val) =>
  acc.concat(Array.isArray(val) ? flatten(val) : val), []);
</pre>
</div>

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