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A preview from our curated question bank. The generator produces fresh, AI-tailored questions on each run.
What is the difference between `==` and `===` in JavaScript?
Tip: `==` uses type coercion (0 == '0' is true). `===` checks both value and type (0 === '0' is false). Always prefer `===` in production code to avoid subtle bugs.
What is the virtual DOM in React and why does it exist?
Tip: It is an in-memory representation of the real DOM. React diffs the virtual DOM before touching the real DOM, minimising expensive repaints and reflows.
Explain CSS specificity. Which rule wins: an ID selector or a class selector?
Tip: Specificity order: inline style > ID > class/pseudo-class/attribute > element. An ID selector (0,1,0,0) beats a class selector (0,0,1,0). Use the three-number notation to explain.
What is event bubbling in JavaScript? How do you stop it?
Tip: Events bubble up from the target element to the root. Use `event.stopPropagation()` to stop bubbling. Distinguish this from `event.preventDefault()` which stops default browser behaviour.
What are the differences between `let`, `const`, and `var`?
Tip: `var`: function-scoped, hoisted. `let`: block-scoped, not hoisted to usable state. `const`: block-scoped, must be initialised, cannot be reassigned (but object properties can mutate).
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