Q1. How do you make a Bash script fail fast and clean up with trap?
Robust scripts fail fast and release resources. ```bash #!/usr/bin/env bash set -euo pipefail cleanup() { rm -f "$tmp"; echo "cleaned" >&2; } tmp=$(mktemp) trap cleanup E...
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Q2. Which HTTP status codes should a REST API return?
Group them by intent and be consistent: - 2xx success: 200 OK, 201 Created (with `Location`), 202 Accepted for async work, 204 No Content after DELETE. - 3xx: 301/308 for...
Q3. How does error handling work in Swift?
Swift uses `throws` functions and `try` for recoverable errors. Errors conform to the `Error` protocol, usually as enums. ```swift enum NetworkError: Error { case badStat...
Q4. 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 ...
Q5. How should a REST API format error responses?
Use one consistent, machine-readable shape. A widely adopted choice is RFC 7807 `application/problem+json`: ```json { "type": "https://example.com/problems/insufficient-f...