Q41. How does dependency injection work in Angular?
Dependency injection supplies instances to classes instead of letting them construct collaborators. Providers are registered at the root (providedIn: 'root'), on a route,...
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Q42. How does reactivity work in Vue 3 with Proxy?
Vue 3 wraps reactive objects in an ES Proxy that intercepts get and set operations. On a get, track() records the currently active effect (a render function, computed or ...
Q43. 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...
Q44. What is the difference between a symbol and a string?
A `Symbol` is an immutable, interned identifier such as `:name`. A `String` is a mutable sequence of characters such as `"name"`. Symbols are stored once, so repeated use...
Q45. 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...
Q46. 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...
Q47. What is the difference between value types and reference types?
Value types store their data directly and are copied on assignment. Reference types store a reference to heap data, and copying copies the reference. - Value types: numer...
Q48. What is the difference between a pointer and a reference?
A pointer is a variable that stores an address. It can be null, reassigned and used with pointer arithmetic. A reference is an alias for an existing object: it must be in...
Q49. What is ownership in Rust and why does the language need it?
Ownership is Rust's compile-time memory management model. Every value has exactly one owner, and when the owner goes out of scope the value is dropped and its memory free...
Q50. How do slices differ from arrays in Go?
An array has a fixed length that is part of its type: `[4]int` and `[5]int` are different types, and copying an array copies all elements. A slice is a small descriptor w...