Q1. What are optionals and how do you safely unwrap them?
An optional represents a value that may be absent: either `.some(value)` or `.none`, written `nil`. Non-optional types can never be nil, and the compiler forces you to un...
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Q2. How does Kotlin handle null safety?
Kotlin's type system distinguishes nullable from non-nullable types. `String` cannot hold null; `String?` can. This moves null checks to compile time and largely eliminat...
Q3. What is the difference between the Options API and the Composition API in Vue 3?
The Options API organises component logic into fixed options such as data, methods, computed, watch and lifecycle hooks. The Composition API organises the same logic insi...
Q4. When should you use guard instead of if let?
Both unwrap optionals, but `guard` is designed for early exit and keeps the happy path unindented. Its `else` branch must exit the current scope with `return`, `break`, `...
Q5. How do Option, Result and the question mark operator work?
`Option` models presence with `Some` and `None`, replacing null. `Result` models success or failure with `Ok` and `Err`, and is how Rust does recoverable errors. ```rust ...