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Head First Design Patterns

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

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Head First Design Patterns

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

Design Principles

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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Head First Design Patterns

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

Design Principles

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

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

Design Principles

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } 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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Repository files navigation

Head First Design Patterns

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

Design Principles

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

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

Design Principles

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

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

Design Principles

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

Head First Design Patterns is a book that introduces a collection of design patterns and principles using humurous images and code written in Java. This respository contains code demonstrating these patterns other languages.

PatternsWriteupImplementations
The Strategy PatternLink
The Observer PatternLink
The Decorator Pattern
The Factory Method Pattern
The Abstract Factory Pattern
The Singleton Pattern
The Command Pattern
The Adapter Pattern
The Facade Pattern
The Template Method Pattern
The Iterator Pattern

The Book & Other Resources

Update A new version of the text was released in December of 2020! Find it on O'Reilly here

The text is a very approachable introduction to design patterns. If you have any Java experience, or are even just comfortable reading code and willing to learn a little, I recommend it.

The code from the book, as well as a number of free and/or alternate media design pattern resources are availble over at WickedlySmart's wesbite - link

Design Principles

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