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Coding Challenges

Learn the concept first, study an example, then solve an original challenge with clear requirements, starter code, hints, an explained solution, and stretch goals.

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Topics Series Typing Tests Snippets

CategoryTopicDifficultySeries

Learn-by-solving challengeNew

Build a Live Password Strength Checker with JavaScript

Build a real-time password strength checker using vanilla JavaScript, regular expressions, DOM events, and accessible feedback. Practice validating password rules and updating a dynamic strength meter.

JavaScript SeriesIntermediate10 min read

#JavaScript #DOM #Password Strength #Regex #Web Development #UI

Learn-by-solving challenge

Build a Responsive Product Filter with Vanilla JavaScript

Create a Responsive Product Filter with JavaScript

Build a responsive product filtering interface with Vanilla JavaScript. Practice search, category filtering, price filtering, DOM updates, empty states, and responsive UI behavior in this practical coding challenge.

Create a Responsive Product Filter with JavaScript SeriesIntermediate10 min read

#JavaScript #DOM #Responsive Design #Filtering #HTML #CSS

Learn-by-solving challenge

Build an Accessible Accordion with HTML, CSS, and JavaScript

Web Accessibility

Practice building a keyboard-friendly, ARIA-supported accordion component using semantic HTML, responsive CSS, and vanilla JavaScript.

Web Accessibility SeriesIntermediate10 min read

#HTML #CSS #JavaScript #Accessibility #ARIA #Web Components #DOM Manipulation

Learn-by-solving challenge

JavaScript Sets & Maps (ES6): Unique Users Challenge

JavaScript Sets & Maps (ES6)

Learn how to use JavaScript Sets and Maps by building a practical function that removes duplicate users and counts how many times each user appears.

JavaScript Sets & Maps (ES6)SeriesIntermediate8 min read

#JavaScript #ES6 #Sets #Maps #Data Structures #Coding Challenge

Learn-by-solving challenge

String Mastery: Validate and Format Usernames in JavaScript

String Manipulation

Practice JavaScript string methods and regular expressions by building a beginner-friendly username cleaner and validator.

String Manipulation SeriesBeginner7 min read

#JavaScript #Strings #Regular Expressions #Arrays #Validation

Learn-by-solving challenge

JavaScript Array Mastery: Push, Pop, and Splice Challenge

Master JavaScript array manipulation by building a command-driven function that uses push, pop, and splice to transform arrays safely and efficiently.

Arrays SeriesBeginner7 min read

#JavaScript #Arrays #Array Methods #Push #Pop #Splice #Coding Challenge

Learn-by-solving challenge

Build an Accessible Tabs Component with HTML, CSS & Vanilla JavaScript Tutorial and Coding Challenge

Web Accessibility

Learn how to build an accessible tabs component using semantic HTML, CSS, and vanilla JavaScript. Practice keyboard navigation, ARIA attributes, and dynamic tab switching with a beginner-friendly coding challenge and complete solution.

Web Accessibility SeriesBeginner8 min read

#HTML #CSS #JavaScript #Accessibility #Tabs #ARIA

Learn-by-solving challenge

Build a Responsive Card Grid with CSS Flexbox

Practice CSS Flexbox by building a responsive product card grid that displays four columns on desktop, two columns on tablet, and one column on mobile.

CSS SeriesBeginner8 min read

#CSS #Flexbox #Responsive Design #Web Development #Beginner

Learn-by-solving challenge

Build an Accessible FAQ Accordion with HTML and CSS

Create a responsive, beginner-friendly FAQ accordion using semantic HTML, native details and summary elements, and CSS styling without JavaScript.

HTML SeriesBeginner8 min read

#HTML #CSS #Accessibility #FAQ #Accordion #Web Development #Beginner

Learn-by-solving challenge

Build an Interactive Image Gallery with HTML, CSS, and JavaScript

JavaScript Problem Solving

Create a responsive image gallery with category filter buttons using HTML, CSS, and vanilla JavaScript while practicing DOM manipulation, event handling, and data attributes.

JavaScript Problem Solving SeriesIntermediate10 min read

#JavaScript Problem Solving #tutorial #coding challenge #practice

Learn-by-solving challenge

Create a Semantic Navigation Bar with HTML

Build a beginner-friendly semantic HTML navigation bar with a site name, accessible links, and simple CSS for a clean horizontal website header.

HTML SeriesBeginner8 min read

#HTML #Navigation Bar #Semantic HTML #Beginner #Web Development #CSS

Learn-by-solving challenge

JavaScript Problem Solving: Count Vowels Coding Challenge

Practice JavaScript problem solving by building a countVowels function that counts vowels in a string, handles edge cases, and explains the logic step by step.

JavaScript SeriesIntermediate5 min read

#JavaScript #String Manipulation #Beginner Challenge #Counting Vowels

Learn-by-solving challenge

Build a Simple Contact Form Page with HTML

Practice HTML form elements by creating a clean, accessible contact form page that collects a user's name, email, and message.

HTML Forms SeriesBeginner5 min read

#HTML #Forms #Beginner

Learn-by-solving challenge

Build Your First Personal Profile Page with HTML

Practice basic HTML structure by building a beginner-friendly personal profile webpage with a heading, bio, hobbies list, and link.

HTML SeriesBeginner5 min read

#HTML #Beginner #Web Development #Personal Profile

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ADPlan smarter without adding more tools to manage.A Faster Way to Organize Solo ProjectsCreate projects, break work into tasks, switch between list, Kanban, and calendar views, and spot overdue work before it slows you down.Try it now

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ADBring structure to every project without the team-tool overload.See What Matters. Finish With Confidence.QuestBoard helps you organize tasks, deadlines, priorities, subtasks, and progress in a clean local-first workspace. Stay clear, focused, and in control from idea to done.Try it now

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ADMake your next move obvious.Plan Projects FasterBreak ideas into tasks, track progress, and stay focused in a private no-login workspace.Try it now

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ADPlan smarter without adding more tools to manage.A Faster Way to Organize Solo ProjectsCreate projects, break work into tasks, switch between list, Kanban, and calendar views, and spot overdue work before it slows you down.Try it now

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ADBring structure to every project without the team-tool overload.See What Matters. Finish With Confidence.QuestBoard helps you organize tasks, deadlines, priorities, subtasks, and progress in a clean local-first workspace. Stay clear, focused, and in control from idea to done.Try it now

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ADMake your next move obvious.Plan Projects FasterBreak ideas into tasks, track progress, and stay focused in a private no-login workspace.Try it now