LWC Interview Mastery
The ultimate technical roadmap for Lightning Web Components. From shadow DOM to specialized wire adapters.
LWC Core Concepts
What is the difference between @track, @wire, and @api decorators?
"They are used to define variables and call apex methods."
@api makes a property public and reactive (passed from parent). @wire is for declarative data fetching from Apex or UI API. @track is now primarily used for sub-properties of objects or array elements, as primitive properties are reactive by default since Spring '20.
How do you communicate between components that are not in the same DOM hierarchy?
"I would use events or parent-child communication."
I would use Lightning Message Service (LMS) for communication across the DOM, including between LWC, Aura, and Visualforce. For components in the same hierarchy, I'd use standard DOM events (bubbling) or public methods (@api).
Performance & Optimization
How do you optimize a Lightning Web Component that handles a large dataset?
"I would use a loading spinner and make sure the query is fast."
I would implement 'infinite loading' or pagination to avoid DOM bloat. I'd also ensure that I'm using @wire with dynamic parameters to only fetch what's needed and utilize client-side filtering where appropriate to reduce Apex calls.
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