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📕 Codecademy Docs

Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?

Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.

What stage of development are we in right now?

Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!

📝 Content Team

We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.

🏗 Engineering Team

How do I contribute?

There are many ways to contribute to Codecademy Docs:

Whether you are a code newbie or a seasoned hacker, there's something for you!

Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.

Additional Notes

Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.

About

Codecademy Docs is a collection of information for all things code. 📕

www.codecademy.com/resources/docs

Resources

Readme

Code of conduct

Code of conduct

Contributing

Contributing
Activity

Stars

0 stars

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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📕 Codecademy Docs
Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?
Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.
What stage of development are we in right now?
Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!
📝 Content Team
We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.
🏗 Engineering Team
How do I contribute?
There are many ways to contribute to Codecademy Docs:
Whether you are a code newbie or a seasoned hacker, there's something for you!
Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.
Additional Notes
Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.
About
Codecademy Docs is a collection of information for all things code. 📕
www.codecademy.com/resources/docs
Resources
Readme
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
0 stars
Watchers
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
📕 Codecademy Docs
Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?
Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.
What stage of development are we in right now?
Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!
📝 Content Team
We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.
🏗 Engineering Team
How do I contribute?
There are many ways to contribute to Codecademy Docs:
Whether you are a code newbie or a seasoned hacker, there's something for you!
Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.
Additional Notes
Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.
About
Codecademy Docs is a collection of information for all things code. 📕
www.codecademy.com/resources/docs
Resources
Readme
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
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📕 Codecademy Docs
Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?
Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.
What stage of development are we in right now?
Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!
📝 Content Team
We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.
🏗 Engineering Team
How do I contribute?
There are many ways to contribute to Codecademy Docs:
Whether you are a code newbie or a seasoned hacker, there's something for you!
Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.
Additional Notes
Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.
About
Codecademy Docs is a collection of information for all things code. 📕
www.codecademy.com/resources/docs
Resources
Readme
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
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0 forks
Report repository
Releases
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Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
📕 Codecademy Docs
Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?
Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.
What stage of development are we in right now?
Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!
📝 Content Team
We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.
🏗 Engineering Team
How do I contribute?
There are many ways to contribute to Codecademy Docs:
Whether you are a code newbie or a seasoned hacker, there's something for you!
Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.
Additional Notes
Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.
About
Codecademy Docs is a collection of information for all things code. 📕
www.codecademy.com/resources/docs
Resources
Readme
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
📕 Codecademy Docs
Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?
Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.
What stage of development are we in right now?
Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!
📝 Content Team
We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.
🏗 Engineering Team
How do I contribute?
There are many ways to contribute to Codecademy Docs:
Whether you are a code newbie or a seasoned hacker, there's something for you!
Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.
Additional Notes
Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.
About
Codecademy Docs is a collection of information for all things code. 📕
www.codecademy.com/resources/docs
Resources
Readme
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
📕 Codecademy Docs
Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?
Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.
What stage of development are we in right now?
Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!
📝 Content Team
We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.
🏗 Engineering Team
How do I contribute?
There are many ways to contribute to Codecademy Docs:
Whether you are a code newbie or a seasoned hacker, there's something for you!
Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.
Additional Notes
Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.
About
Codecademy Docs is a collection of information for all things code. 📕
www.codecademy.com/resources/docs
Resources
Readme
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
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📕 Codecademy Docs
Documentation for popular programming languages and frameworks.
Built by the community. Maintained by Codecademy.

What is Docs?
Codecademy Docs is a free, easily accessible reference for coding terms and concepts, available to developers all over the world. If you forget what JavaScript hoisting is, we want you to be able to look up "JS hoisting" on any search engine, click a Codecademy Doc entry, and have an answer in seconds.
What stage of development are we in right now?
Docs is live with over 1000 high-quality entries. Now that the MVP is out, our goal is to transition some ownership of Docs content to the Codecademy community, since maintaining a resource of this type at-scale is only possible if it's open-contribution. That means we need your help, whether it's contributing, reviewing, or evangelizing!
📝 Content Team
We are currently building a team of community volunteers and educators to maintain Codecademy Docs. Let us know if you are interested.
🏗 Engineering Team
How do I contribute?
There are many ways to contribute to Codecademy Docs:
Whether you are a code newbie or a seasoned hacker, there's something for you!
Please read through the Contribution Guide ✨. There you'll find a write-up of our content standards and style guide, as well as templates for creating your entries.
Additional Notes
Remember, if you ever have any questions at all, we're always here to help in the Codecademy Forums and Codecademy Discord.
About
Codecademy Docs is a collection of information for all things code. 📕
www.codecademy.com/resources/docs
Resources
Readme
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages