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Fantom Programming Language

Fantom is a portable language that runs on the JVM and modern web browsers. It features a familiar Java-like syntax, static (and dynamic) typing, elegant system library, closures, immutability, actor concurrency, and much more.

// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}

Fantom Website

https://fantom.org

Installing

Download the latest official release from fantom.org. See Setup for installation details.

Installers are also available for macOS and Windows:

Docker

This repo vends a docker image that can be downloaded and run locally using:

docker run -it ghcr.io/fantom-lang/fantom:latest bash

It can be used in other dockerfiles using the FROM command:

FROM ghcr.io/fantom-lang/fantom:latest AS build

Community

We are most active on the Forum, but also hang out on Slack.

Bugs and feature requests should be reported on the Forum.

Contributing

See contrib.md for how to contribute to Fantom.

About

Fantom Programming Language

fantom.org

Topics

fantom

Resources

Readme
AFL-3.0 license
Activity
Custom properties

Stars

154 stars

Watchers

8 watching

Forks

51 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, '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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BranchesTags
Repository files navigation
Fantom Programming Language
Fantom is a portable language that runs on the JVM and modern web browsers. It
features a familiar Java-like syntax, static (and dynamic) typing, elegant
system library, closures, immutability, actor concurrency, and much more.
// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}
Fantom Website
https://fantom.org
Installing
Download the latest official release from fantom.org.
See Setup for installation details.
Installers are also available for macOS and Windows:
Docker
This repo vends a docker image that can be downloaded and run locally using:
docker run -it ghcr.io/fantom-lang/fantom:latest bash
It can be used in other dockerfiles using the FROM command:
FROM ghcr.io/fantom-lang/fantom:latest AS build
Community
We are most active on the Forum, but also hang out on Slack.
Bugs and feature requests should be reported on the Forum.
Contributing
See contrib.md
for how to contribute to Fantom.
About
Fantom Programming Language
fantom.org
Topics
fantom
Resources
Readme
AFL-3.0 license
Activity
Custom properties
Stars
154 stars
Watchers
8 watching
Forks
51 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, '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
Fantom Programming Language
Fantom is a portable language that runs on the JVM and modern web browsers. It
features a familiar Java-like syntax, static (and dynamic) typing, elegant
system library, closures, immutability, actor concurrency, and much more.
// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}
Fantom Website
https://fantom.org
Installing
Download the latest official release from fantom.org.
See Setup for installation details.
Installers are also available for macOS and Windows:
Docker
This repo vends a docker image that can be downloaded and run locally using:
docker run -it ghcr.io/fantom-lang/fantom:latest bash
It can be used in other dockerfiles using the FROM command:
FROM ghcr.io/fantom-lang/fantom:latest AS build
Community
We are most active on the Forum, but also hang out on Slack.
Bugs and feature requests should be reported on the Forum.
Contributing
See contrib.md
for how to contribute to Fantom.
About
Fantom Programming Language
fantom.org
Topics
fantom
Resources
Readme
AFL-3.0 license
Activity
Custom properties
Stars
154 stars
Watchers
8 watching
Forks
51 forks
Report repository
Releases
Packages
Used by
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
Repository files navigation
Fantom Programming Language
Fantom is a portable language that runs on the JVM and modern web browsers. It
features a familiar Java-like syntax, static (and dynamic) typing, elegant
system library, closures, immutability, actor concurrency, and much more.
// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}
Fantom Website
https://fantom.org
Installing
Download the latest official release from fantom.org.
See Setup for installation details.
Installers are also available for macOS and Windows:
Docker
This repo vends a docker image that can be downloaded and run locally using:
docker run -it ghcr.io/fantom-lang/fantom:latest bash
It can be used in other dockerfiles using the FROM command:
FROM ghcr.io/fantom-lang/fantom:latest AS build
Community
We are most active on the Forum, but also hang out on Slack.
Bugs and feature requests should be reported on the Forum.
Contributing
See contrib.md
for how to contribute to Fantom.
About
Fantom Programming Language
fantom.org
Topics
fantom
Resources
Readme
AFL-3.0 license
Activity
Custom properties
Stars
154 stars
Watchers
8 watching
Forks
51 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, '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
Fantom Programming Language
Fantom is a portable language that runs on the JVM and modern web browsers. It
features a familiar Java-like syntax, static (and dynamic) typing, elegant
system library, closures, immutability, actor concurrency, and much more.
// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}
Fantom Website
https://fantom.org
Installing
Download the latest official release from fantom.org.
See Setup for installation details.
Installers are also available for macOS and Windows:
Docker
This repo vends a docker image that can be downloaded and run locally using:
docker run -it ghcr.io/fantom-lang/fantom:latest bash
It can be used in other dockerfiles using the FROM command:
FROM ghcr.io/fantom-lang/fantom:latest AS build
Community
We are most active on the Forum, but also hang out on Slack.
Bugs and feature requests should be reported on the Forum.
Contributing
See contrib.md
for how to contribute to Fantom.
About
Fantom Programming Language
fantom.org
Topics
fantom
Resources
Readme
AFL-3.0 license
Activity
Custom properties
Stars
154 stars
Watchers
8 watching
Forks
51 forks
Report repository
Releases
Packages
Used by
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
Fantom Programming Language
Fantom is a portable language that runs on the JVM and modern web browsers. It
features a familiar Java-like syntax, static (and dynamic) typing, elegant
system library, closures, immutability, actor concurrency, and much more.
// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}
Fantom Website
https://fantom.org
Installing
Download the latest official release from fantom.org.
See Setup for installation details.
Installers are also available for macOS and Windows:
Docker
This repo vends a docker image that can be downloaded and run locally using:
docker run -it ghcr.io/fantom-lang/fantom:latest bash
It can be used in other dockerfiles using the FROM command:
FROM ghcr.io/fantom-lang/fantom:latest AS build
Community
We are most active on the Forum, but also hang out on Slack.
Bugs and feature requests should be reported on the Forum.
Contributing
See contrib.md
for how to contribute to Fantom.
About
Fantom Programming Language
fantom.org
Topics
fantom
Resources
Readme
AFL-3.0 license
Activity
Custom properties
Stars
154 stars
Watchers
8 watching
Forks
51 forks
Report repository
Releases
Packages
Used by
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
Fantom Programming Language
Fantom is a portable language that runs on the JVM and modern web browsers. It
features a familiar Java-like syntax, static (and dynamic) typing, elegant
system library, closures, immutability, actor concurrency, and much more.
// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}
Fantom Website
https://fantom.org
Installing
Download the latest official release from fantom.org.
See Setup for installation details.
Installers are also available for macOS and Windows:
Docker
This repo vends a docker image that can be downloaded and run locally using:
docker run -it ghcr.io/fantom-lang/fantom:latest bash
It can be used in other dockerfiles using the FROM command:
FROM ghcr.io/fantom-lang/fantom:latest AS build
Community
We are most active on the Forum, but also hang out on Slack.
Bugs and feature requests should be reported on the Forum.
Contributing
See contrib.md
for how to contribute to Fantom.
About
Fantom Programming Language
fantom.org
Topics
fantom
Resources
Readme
AFL-3.0 license
Activity
Custom properties
Stars
154 stars
Watchers
8 watching
Forks
51 forks
Report repository
Releases
Packages
Used by
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
BranchesTags
Repository files navigation
Fantom Programming Language
Fantom is a portable language that runs on the JVM and modern web browsers. It
features a familiar Java-like syntax, static (and dynamic) typing, elegant
system library, closures, immutability, actor concurrency, and much more.
// Hello from Fantom!class HelloWorld
{
staticVoid main()
{
echo("Hello, World!")
}
}
Fantom Website
https://fantom.org
Installing
Download the latest official release from fantom.org.
See Setup for installation details.
Installers are also available for macOS and Windows:
Docker
This repo vends a docker image that can be downloaded and run locally using:
docker run -it ghcr.io/fantom-lang/fantom:latest bash
It can be used in other dockerfiles using the FROM command:
FROM ghcr.io/fantom-lang/fantom:latest AS build
Community
We are most active on the Forum, but also hang out on Slack.
Bugs and feature requests should be reported on the Forum.
Contributing
See contrib.md
for how to contribute to Fantom.
About
Fantom Programming Language
fantom.org
Topics
fantom
Resources
Readme
AFL-3.0 license
Activity
Custom properties
Stars
154 stars
Watchers
8 watching
Forks
51 forks
Report repository
Releases
Packages
Used by
Contributors
Languages