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Elixir Koans

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Elixir koans is a fun way to get started with the elixir programming language. It is a tour of the most important features and idiomatic usage of the language.

Prerequisites

You need to have Elixir installed. Please refer to the official guide for instructions.

First, clone the repo from GitHub:

$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/

Next, fetch mix dependencies by running:

$ mix deps.get

You might get prompted to install further dependencies. Reply "y".

On Linux, you'll need to install inotify-tools to be able to use the autorunner in this project.

Running

With the dependencies installed, navigate to the root directory of this project and run:

$ mix meditate

You should see the first failure. Open the corresponding file in your favourite text editor and fill in the blanks to make the koans pass one by one. The autorunner will give you feedback each time you save.

If you want the autorunner to show you your previous results, run it with --no-clear-screen

$ mix meditate --no-clear-screen

If you want to jump to a specific lesson, run it with --koan=<koan name>

$ mix meditate --koan=PatternMatching

Any typos on the koan name will show the complete list of koans, where you can pick any.

Contributing

We welcome contributions! If something does not make sense along the way or you feel like an important lesson is missing from the koans, feel free to fork the project and open a pull request.

List of contributors.

About

Elixir learning exercises

Resources

Readme
MIT license
Activity

Stars

1 star

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

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" + '

Skip to content
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Elixir Koans
Build Status
Elixir koans is a fun way to get started with the elixir programming language. It is a tour
of the most important features and idiomatic usage of the language.
Prerequisites
You need to have Elixir installed. Please refer to the official guide for instructions.
First, clone the repo from GitHub:
$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/
Next, fetch mix dependencies by running:
$ mix deps.get
You might get prompted to install further dependencies. Reply "y".
On Linux, you'll need to install inotify-tools to be able
to use the autorunner in this project.
Running
With the dependencies installed, navigate to the root directory of this project and run:
$ mix meditate
You should see the first failure. Open the corresponding file in your favourite text editor
and fill in the blanks to make the koans pass one by one.
The autorunner will give you feedback each time you save.
If you want the autorunner to show you your previous results, run it with --no-clear-screen
$ mix meditate --no-clear-screen
If you want to jump to a specific lesson, run it with --koan=<koan name>
$ mix meditate --koan=PatternMatching
Any typos on the koan name will show the complete list of koans, where you can pick any.
Contributing
We welcome contributions! If something does not make sense along the way or you feel
like an important lesson is missing from the koans, feel free to fork the project
and open a pull request.
List of contributors.
About
Elixir learning exercises
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
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
Elixir Koans
Build Status
Elixir koans is a fun way to get started with the elixir programming language. It is a tour
of the most important features and idiomatic usage of the language.
Prerequisites
You need to have Elixir installed. Please refer to the official guide for instructions.
First, clone the repo from GitHub:
$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/
Next, fetch mix dependencies by running:
$ mix deps.get
You might get prompted to install further dependencies. Reply "y".
On Linux, you'll need to install inotify-tools to be able
to use the autorunner in this project.
Running
With the dependencies installed, navigate to the root directory of this project and run:
$ mix meditate
You should see the first failure. Open the corresponding file in your favourite text editor
and fill in the blanks to make the koans pass one by one.
The autorunner will give you feedback each time you save.
If you want the autorunner to show you your previous results, run it with --no-clear-screen
$ mix meditate --no-clear-screen
If you want to jump to a specific lesson, run it with --koan=<koan name>
$ mix meditate --koan=PatternMatching
Any typos on the koan name will show the complete list of koans, where you can pick any.
Contributing
We welcome contributions! If something does not make sense along the way or you feel
like an important lesson is missing from the koans, feel free to fork the project
and open a pull request.
List of contributors.
About
Elixir learning exercises
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 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
Repository files navigation
Elixir Koans
Build Status
Elixir koans is a fun way to get started with the elixir programming language. It is a tour
of the most important features and idiomatic usage of the language.
Prerequisites
You need to have Elixir installed. Please refer to the official guide for instructions.
First, clone the repo from GitHub:
$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/
Next, fetch mix dependencies by running:
$ mix deps.get
You might get prompted to install further dependencies. Reply "y".
On Linux, you'll need to install inotify-tools to be able
to use the autorunner in this project.
Running
With the dependencies installed, navigate to the root directory of this project and run:
$ mix meditate
You should see the first failure. Open the corresponding file in your favourite text editor
and fill in the blanks to make the koans pass one by one.
The autorunner will give you feedback each time you save.
If you want the autorunner to show you your previous results, run it with --no-clear-screen
$ mix meditate --no-clear-screen
If you want to jump to a specific lesson, run it with --koan=<koan name>
$ mix meditate --koan=PatternMatching
Any typos on the koan name will show the complete list of koans, where you can pick any.
Contributing
We welcome contributions! If something does not make sense along the way or you feel
like an important lesson is missing from the koans, feel free to fork the project
and open a pull request.
List of contributors.
About
Elixir learning exercises
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
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
Elixir Koans
Build Status
Elixir koans is a fun way to get started with the elixir programming language. It is a tour
of the most important features and idiomatic usage of the language.
Prerequisites
You need to have Elixir installed. Please refer to the official guide for instructions.
First, clone the repo from GitHub:
$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/
Next, fetch mix dependencies by running:
$ mix deps.get
You might get prompted to install further dependencies. Reply "y".
On Linux, you'll need to install inotify-tools to be able
to use the autorunner in this project.
Running
With the dependencies installed, navigate to the root directory of this project and run:
$ mix meditate
You should see the first failure. Open the corresponding file in your favourite text editor
and fill in the blanks to make the koans pass one by one.
The autorunner will give you feedback each time you save.
If you want the autorunner to show you your previous results, run it with --no-clear-screen
$ mix meditate --no-clear-screen
If you want to jump to a specific lesson, run it with --koan=<koan name>
$ mix meditate --koan=PatternMatching
Any typos on the koan name will show the complete list of koans, where you can pick any.
Contributing
We welcome contributions! If something does not make sense along the way or you feel
like an important lesson is missing from the koans, feel free to fork the project
and open a pull request.
List of contributors.
About
Elixir learning exercises
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 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
Elixir Koans
Build Status
Elixir koans is a fun way to get started with the elixir programming language. It is a tour
of the most important features and idiomatic usage of the language.
Prerequisites
You need to have Elixir installed. Please refer to the official guide for instructions.
First, clone the repo from GitHub:
$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/
Next, fetch mix dependencies by running:
$ mix deps.get
You might get prompted to install further dependencies. Reply "y".
On Linux, you'll need to install inotify-tools to be able
to use the autorunner in this project.
Running
With the dependencies installed, navigate to the root directory of this project and run:
$ mix meditate
You should see the first failure. Open the corresponding file in your favourite text editor
and fill in the blanks to make the koans pass one by one.
The autorunner will give you feedback each time you save.
If you want the autorunner to show you your previous results, run it with --no-clear-screen
$ mix meditate --no-clear-screen
If you want to jump to a specific lesson, run it with --koan=<koan name>
$ mix meditate --koan=PatternMatching
Any typos on the koan name will show the complete list of koans, where you can pick any.
Contributing
We welcome contributions! If something does not make sense along the way or you feel
like an important lesson is missing from the koans, feel free to fork the project
and open a pull request.
List of contributors.
About
Elixir learning exercises
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 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
Elixir Koans
Build Status
Elixir koans is a fun way to get started with the elixir programming language. It is a tour
of the most important features and idiomatic usage of the language.
Prerequisites
You need to have Elixir installed. Please refer to the official guide for instructions.
First, clone the repo from GitHub:
$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/
Next, fetch mix dependencies by running:
$ mix deps.get
You might get prompted to install further dependencies. Reply "y".
On Linux, you'll need to install inotify-tools to be able
to use the autorunner in this project.
Running
With the dependencies installed, navigate to the root directory of this project and run:
$ mix meditate
You should see the first failure. Open the corresponding file in your favourite text editor
and fill in the blanks to make the koans pass one by one.
The autorunner will give you feedback each time you save.
If you want the autorunner to show you your previous results, run it with --no-clear-screen
$ mix meditate --no-clear-screen
If you want to jump to a specific lesson, run it with --koan=<koan name>
$ mix meditate --koan=PatternMatching
Any typos on the koan name will show the complete list of koans, where you can pick any.
Contributing
We welcome contributions! If something does not make sense along the way or you feel
like an important lesson is missing from the koans, feel free to fork the project
and open a pull request.
List of contributors.
About
Elixir learning exercises
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 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
BranchesTags
Repository files navigation
Elixir Koans
Build Status
Elixir koans is a fun way to get started with the elixir programming language. It is a tour
of the most important features and idiomatic usage of the language.
Prerequisites
You need to have Elixir installed. Please refer to the official guide for instructions.
First, clone the repo from GitHub:
$ git clone https://github.com/elixirkoans/elixir-koans.git
$ cd elixir-koans/
Next, fetch mix dependencies by running:
$ mix deps.get
You might get prompted to install further dependencies. Reply "y".
On Linux, you'll need to install inotify-tools to be able
to use the autorunner in this project.
Running
With the dependencies installed, navigate to the root directory of this project and run:
$ mix meditate
You should see the first failure. Open the corresponding file in your favourite text editor
and fill in the blanks to make the koans pass one by one.
The autorunner will give you feedback each time you save.
If you want the autorunner to show you your previous results, run it with --no-clear-screen
$ mix meditate --no-clear-screen
If you want to jump to a specific lesson, run it with --koan=<koan name>
$ mix meditate --koan=PatternMatching
Any typos on the koan name will show the complete list of koans, where you can pick any.
Contributing
We welcome contributions! If something does not make sense along the way or you feel
like an important lesson is missing from the koans, feel free to fork the project
and open a pull request.
List of contributors.
About
Elixir learning exercises
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages