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About this course
JavaScript interviews concentrate on a small set of places where the language does something other than what it appears to do: what this refers to, when a variable exists, what the event loop runs next, and why an await inside a loop is slower than it looks. Node.js adds a second layer — streams, buffers, the process environment, and failure modes that only appear under load. This course drills those specific edges as practice questions rather than covering the language from the beginning.
What it covers
Eight topics: language mechanics and gotchas including scope, hoisting, this binding, type coercion and equality; objects, prototypes and data structures; asynchronous JavaScript with the event loop, promises and async/await; the Node.js runtime with streams and buffers; the event system and middleware lifecycle; error handling and async failures; memory, performance and concurrency including garbage collection and security concerns; and a closing mastery topic on comparisons and applied scenarios.
Who this is for
Developers with working JavaScript who are preparing for interviews and want the edge cases rather than the basics. It assumes you have written JavaScript and used Node for something real — if you are starting out, the JavaScript Fundamentals and Node.js courses come first. It is deliberately weighted toward the questions interviewers reuse.
How MCQ practice works on Abekus
The course is organised as topics, subtopics, and individual lessons. Each lesson pairs a short set of explanation cards with practice questions written for that lesson, so the questions test the idea you just read rather than a general survey. Wrong answers come with a worked explanation, and the AI guide surfaces the mistakes you keep repeating.