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TemplatesBrowse free UI templates and components for web and mobile projects.Interview Q&A169 questions with short answers, code and downloadable PDFs.BlogStep-by-step guides on landing pages, funnels, email and digital products.HostingCompare free and paid hosting options before you launch a project.

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  1. Q1MediumJavaScriptWhat is a closure in JavaScript and why is it useful?A closure is a function that keeps access to the variables of the scope where it was created, even after that outer function has finished running.
  2. Q2MediumJavaScriptWhat is the event loop in JavaScript and how does it work?The event loop is the mechanism that lets single-threaded JavaScript handle asynchronous work: it runs the call stack to empty, then runs all queued microtasks (promises), then takes the next task (timers, events) from the queue.
  3. Q3MediumReactHow does useEffect work in React and what is the dependency array?useEffect runs a function after the component renders; the dependency array tells React when to re-run it: with no array it runs after every render, with an empty array only after the first, and with values only when those values change.
  4. Q4EasyNode.jsWhat is Node.js and why is it called single-threaded?Node.js is a JavaScript runtime built on Chrome's V8 engine that runs your JavaScript on a single main thread and uses non-blocking I/O, so one thread can handle many concurrent connections.
  5. Q5EasySQLWhat is the difference between INNER JOIN and LEFT JOIN in SQL?INNER JOIN returns only rows that have a match in both tables, while LEFT JOIN returns every row from the left table and fills the right table's columns with NULL when there is no match.
  6. Q6MediumSQLWhat is an index in SQL and how does it improve performance?An index is a separate sorted data structure (usually a B-tree) that lets the database find rows without scanning the whole table, at the cost of extra storage and slower writes.
JavaScriptReactNode.jsTypeScriptSQLPythonJavaC#

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