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JavaScript Modern Interview Code Challenges

Collection of modern interview code challenges on JavaScript suitable for

Interviewees | Interviewers | Knowledge test | Practice

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JavaScript Modern Interview Code Challenges by topic

PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges

Usage Guide and Study materials

Contributing Guide

If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

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License

This repository is MIT licensed. Read more

About

A collection of JavaScript modern interview code challenges for beginners to experts

Resources

Readme
MIT license

Code of conduct

Code of conduct

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Contributing
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} 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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JavaScript Modern Interview Code Challenges
Collection of modern interview code challenges on JavaScript suitable for
Interviewees | Interviewers | Knowledge test | Practice
banner
Show your support by giving a ⭐ to this repo
Feel free to connect with me on sadanandpai
Buy Me A Coffee
JavaScript Modern Interview Code Challenges by topic
PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges
Usage Guide and Study materials
Contributing Guide
If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

Stargazers
Stargazers repo roster for @sadanandpai/javascript-code-challenges
Forkers
Forkers repo roster for @sadanandpai/javascript-code-challenges
License
This repository is MIT licensed. Read more
About
A collection of JavaScript modern interview code challenges for beginners to experts
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
1 star
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0 watching
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0 forks
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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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JavaScript Modern Interview Code Challenges
Collection of modern interview code challenges on JavaScript suitable for
Interviewees | Interviewers | Knowledge test | Practice
banner
Show your support by giving a ⭐ to this repo
Feel free to connect with me on sadanandpai
Buy Me A Coffee
JavaScript Modern Interview Code Challenges by topic
PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges
Usage Guide and Study materials
Contributing Guide
If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

Stargazers
Stargazers repo roster for @sadanandpai/javascript-code-challenges
Forkers
Forkers repo roster for @sadanandpai/javascript-code-challenges
License
This repository is MIT licensed. Read more
About
A collection of JavaScript modern interview code challenges for beginners to experts
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
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1 star
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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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JavaScript Modern Interview Code Challenges
Collection of modern interview code challenges on JavaScript suitable for
Interviewees | Interviewers | Knowledge test | Practice
banner
Show your support by giving a ⭐ to this repo
Feel free to connect with me on sadanandpai
Buy Me A Coffee
JavaScript Modern Interview Code Challenges by topic
PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges
Usage Guide and Study materials
Contributing Guide
If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

Stargazers
Stargazers repo roster for @sadanandpai/javascript-code-challenges
Forkers
Forkers repo roster for @sadanandpai/javascript-code-challenges
License
This repository is MIT licensed. Read more
About
A collection of JavaScript modern interview code challenges for beginners to experts
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, '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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JavaScript Modern Interview Code Challenges
Collection of modern interview code challenges on JavaScript suitable for
Interviewees | Interviewers | Knowledge test | Practice
banner
Show your support by giving a ⭐ to this repo
Feel free to connect with me on sadanandpai
Buy Me A Coffee
JavaScript Modern Interview Code Challenges by topic
PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges
Usage Guide and Study materials
Contributing Guide
If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

Stargazers
Stargazers repo roster for @sadanandpai/javascript-code-challenges
Forkers
Forkers repo roster for @sadanandpai/javascript-code-challenges
License
This repository is MIT licensed. Read more
About
A collection of JavaScript modern interview code challenges for beginners to experts
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, '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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JavaScript Modern Interview Code Challenges
Collection of modern interview code challenges on JavaScript suitable for
Interviewees | Interviewers | Knowledge test | Practice
banner
Show your support by giving a ⭐ to this repo
Feel free to connect with me on sadanandpai
Buy Me A Coffee
JavaScript Modern Interview Code Challenges by topic
PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges
Usage Guide and Study materials
Contributing Guide
If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

Stargazers
Stargazers repo roster for @sadanandpai/javascript-code-challenges
Forkers
Forkers repo roster for @sadanandpai/javascript-code-challenges
License
This repository is MIT licensed. Read more
About
A collection of JavaScript modern interview code challenges for beginners to experts
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
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Contributors

, '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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JavaScript Modern Interview Code Challenges
Collection of modern interview code challenges on JavaScript suitable for
Interviewees | Interviewers | Knowledge test | Practice
banner
Show your support by giving a ⭐ to this repo
Feel free to connect with me on sadanandpai
Buy Me A Coffee
JavaScript Modern Interview Code Challenges by topic
PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges
Usage Guide and Study materials
Contributing Guide
If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

Stargazers
Stargazers repo roster for @sadanandpai/javascript-code-challenges
Forkers
Forkers repo roster for @sadanandpai/javascript-code-challenges
License
This repository is MIT licensed. Read more
About
A collection of JavaScript modern interview code challenges for beginners to experts
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
1 star
Watchers
0 watching
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0 forks
Report repository
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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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JavaScript Modern Interview Code Challenges
Collection of modern interview code challenges on JavaScript suitable for
Interviewees | Interviewers | Knowledge test | Practice
banner
Show your support by giving a ⭐ to this repo
Feel free to connect with me on sadanandpai
Buy Me A Coffee
JavaScript Modern Interview Code Challenges by topic
PrimitivesFunctionsObjectsCollectionsAsync
ConceptsConceptsConceptsConceptsConcepts
ChallengesChallengesChallengesChallengesChallenges
Usage Guide and Study materials
Contributing Guide
If you want to contribute, improve or suggest changes to this repo, then check out the Contributing Guide

Stargazers
Stargazers repo roster for @sadanandpai/javascript-code-challenges
Forkers
Forkers repo roster for @sadanandpai/javascript-code-challenges
License
This repository is MIT licensed. Read more
About
A collection of JavaScript modern interview code challenges for beginners to experts
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors