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PureScript by Example

This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.

If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.

Status

This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.

Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.

About the Book

PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.

Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.

This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.

Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:

  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution

License

Copyright (c) 2014-2017 Phil Freeman.

The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.

Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.

The exercises are licensed under the MIT license.

About

Sources for the PureScript book

book.purescript.org/

Resources

Readme

Contributing

Contributing
Activity

Stars

0 stars

Watchers

0 watching

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0 forks
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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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PureScript by Example
This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.
If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.
Status
This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.
Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.
About the Book
PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.
Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.
This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.
Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:
  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution
License
Copyright (c) 2014-2017 Phil Freeman.
The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.
Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.
The exercises are licensed under the MIT license.
About
Sources for the PureScript book
book.purescript.org/
Resources
Readme
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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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('^' + ".*" + '

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PureScript by Example
This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.
If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.
Status
This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.
Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.
About the Book
PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.
Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.
This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.
Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:
  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution
License
Copyright (c) 2014-2017 Phil Freeman.
The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.
Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.
The exercises are licensed under the MIT license.
About
Sources for the PureScript book
book.purescript.org/
Resources
Readme
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
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, '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
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PureScript by Example
This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.
If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.
Status
This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.
Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.
About the Book
PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.
Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.
This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.
Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:
  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution
License
Copyright (c) 2014-2017 Phil Freeman.
The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.
Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.
The exercises are licensed under the MIT license.
About
Sources for the PureScript book
book.purescript.org/
Resources
Readme
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
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0 forks
Report repository
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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" + '

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PureScript by Example
This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.
If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.
Status
This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.
Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.
About the Book
PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.
Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.
This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.
Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:
  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution
License
Copyright (c) 2014-2017 Phil Freeman.
The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.
Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.
The exercises are licensed under the MIT license.
About
Sources for the PureScript book
book.purescript.org/
Resources
Readme
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
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, '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('^' + ".*" + '

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PureScript by Example
This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.
If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.
Status
This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.
Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.
About the Book
PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.
Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.
This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.
Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:
  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution
License
Copyright (c) 2014-2017 Phil Freeman.
The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.
Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.
The exercises are licensed under the MIT license.
About
Sources for the PureScript book
book.purescript.org/
Resources
Readme
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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, '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('^' + ".*" + '

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PureScript by Example
This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.
If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.
Status
This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.
Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.
About the Book
PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.
Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.
This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.
Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:
  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution
License
Copyright (c) 2014-2017 Phil Freeman.
The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.
Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.
The exercises are licensed under the MIT license.
About
Sources for the PureScript book
book.purescript.org/
Resources
Readme
Contributing
Contributing
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
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, '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); }
})();
})();

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PureScript by Example
This repository contains a community fork of PureScript by Example by Phil Freeman, also known as "the PureScript book". This version differs from the original in that it has been updated so that the code and exercises work with up-to-date versions of the compiler, libraries, and tools. Some chapters have also been rewritten to showcase the latest features of the PureScript ecosystem.
If you enjoyed the book or found it useful, please consider buying a copy of the original on Leanpub.
Status
This book is being continuously updated as the language evolves, so please report any issues you discover with the material. We appreciate any feedback you have to share, even if it's as simple as pointing out a confusing section that we could make more beginner-friendly.
Unit tests are also being added to each chapter so you can check if your answers to the exercises are correct. See #79 for the latest status on tests.
About the Book
PureScript is a small, strongly, statically typed programming language with expressive types, written in and inspired by Haskell, and compiling to Javascript.
Functional programming in JavaScript has seen quite a lot of popularity recently, but large-scale application development is hindered by the lack of a disciplined environment in which to write code. PureScript aims to solve that problem by bringing the power of strongly-typed functional programming to the world of JavaScript development.
This book will show you how to get started with the PureScript programming language, from the basics (setting up a development environment) to the advanced.
Each chapter will be motivated by a particular problem, and in the course of solving that problem, new functional programming tools and techniques will be introduced. Here are some examples of problems that will be solved in this book:
  • Transforming data structures with maps and folds
  • Form field validation using applicative functors
  • Testing code with QuickCheck
  • Using the canvas
  • Domain specific language implementation
  • Working with the DOM
  • JavaScript interoperability
  • Parallel asynchronous execution
License
Copyright (c) 2014-2017 Phil Freeman.
The text of this book is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: https://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US.
Some text is derived from the PureScript Documentation Repo, which uses the same license, and is copyright various contributors.
The exercises are licensed under the MIT license.
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Sources for the PureScript book
book.purescript.org/
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