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What scenarios require local variables instead of global ones?

General/Othereasy0.2 min readPremium
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Virtusa
Key Concepts Tested
spark
Expert AnswerPremium
45 wordsInterview-ready
**Locals when:** (1) Encapsulation—function-scoped data (loops, temps). (2) Thread safety—globals cause races. (3) Memory—locals reclaimed on return. (4) Testability—pure functions. **Trade-off:** Globals only for singletons (config); use DI. **Scalability:** In Spark UDFs/Lambda, avoid module-level mutable state—cross-request contamination....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Virtusa. The answer also includes follow-up discussion points that interviewers commonly explore.

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