Skolarli JavaScript tutorials are hands-on, step-by-step walkthroughs you can follow and run. Each one answers a single concrete question, shows the working code, and explains the tradeoffs.
General
Ten questions on reduce, sorting, and the mutation traps that catch even experienced developers, including why sort() breaks numeric ordering without a comparator. Built for candidates who already know map and forEach and want to go deeper into correctness pitfalls.
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Ten questions on applied closure patterns, private state, memoization, currying, and the scope chain that underpins them all, plus the var-in-a-loop bug in every form it appears. Built for candidates who already know what a closure is and want to go deeper into how it's actually used and tested.
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Fifteen JavaScript interview questions for intermediate frontend, backend, and full-stack candidates, covering closures, the event loop, type coercion, and array methods, with working code and the reasoning behind each quirky output. Built around explaining the mechanism, not just producing the right result.
Read tutorialEvery tutorial opens with a direct answer to the question in its title, then walks through the working solution step by step. Code you can copy sits in a syntax-highlighted block. Tutorials that belong to a series are ordered from beginner to advanced so you can follow a path rather than hunt for the next piece.
Looking to sharpen judgment rather than complete a task — interviews, career moves, what to look for when applying? Those live in Guides.
For hiring & L&D teams
These tutorials are also where teams come to shape their question banks. If you're putting together coding assessments, technical screens, or a question library for hiring or training, Skolarli's assessment platform does it at scale — with proctoring and integrity built in. Tell us what you're assessing for.