Q1. What is the difference between single quotes and double quotes?
Single quotes preserve everything literally, while double quotes allow variable expansion, command substitution and some escape sequences. ```bash name="world" echo 'hell...
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Q2. How do responsive and dark-mode variants work in Tailwind?
Tailwind encodes variants as prefixes. Responsive breakpoints are mobile-first: sm, md, lg, xl and 2xl apply at that minimum width and above. ```html ... ``` That element...
Q3. What is the difference between val and var?
`val` declares a read-only reference that cannot be reassigned after initialisation. `var` declares a mutable reference that can be reassigned. ```kotlin val name = "Ada"...
Q4. What is encapsulation and why does it matter?
Encapsulation means bundling data with the operations that act on it and restricting direct access to the internals. The class exposes a deliberate public API and keeps f...
Q5. How do you write a custom Tailwind plugin?
A plugin is a function passed to plugins in the config. It receives helpers including addUtilities, addComponents, addBase, addVariant, matchUtilities and theme. ```js co...
Q6. How do generics and constraints work in C#?
Generics let you write type-safe, reusable code without boxing or casts. The type parameter is resolved at compile time, and the JIT specialises for value types while sha...
Q7. How do you perform a variance analysis against budget?
Variance analysis compares actual results with the budget or forecast and explains the gap. I start by calculating the variance in absolute terms and as a percentage, the...
Q8. How do variables, $?, $@ and $* behave?
Shell variables hold strings and have no strict typing. `$?` is the exit status of the last command, where 0 means success. ```bash greeting="hello" echo "${greeting} wor...
Q9. Explain declaration-site variance with in and out.
Variance describes how generic types relate when their type arguments are related. `out T` (covariant) means `Producer` can be used where `Producer` is expected. `in T` (...