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You want to create a Ruby hash to store user settings where keys are fixed and accessed frequently. Which approach is best and why?

hard📝 Application Q8 of 15
Ruby - Hashes
You want to create a Ruby hash to store user settings where keys are fixed and accessed frequently. Which approach is best and why?
AUse string keys because they are mutable and flexible.
BUse string keys because they automatically convert to symbols.
CUse symbol keys only if keys are dynamic and change often.
DUse symbol keys because they are immutable and memory efficient.
Step-by-Step Solution
Solution:

  1. Step 1: Consider key usage pattern

    Fixed keys accessed frequently benefit from symbols because symbols are immutable and stored only once.

  2. Step 2: Evaluate memory and speed

    Symbols use less memory and are faster to compare than strings, making them ideal for fixed keys.

  3. Final Answer:

    Use symbol keys because they are immutable and memory efficient. -> Option D

  4. Quick Check:

    Fixed keys use symbols for efficiency = C [OK]
Quick Trick: Fixed keys? Use symbols for speed and memory savings [OK]
Common Mistakes:
  • Choosing strings for fixed keys unnecessarily
  • Believing symbols convert automatically from strings
  • Using symbols for frequently changing keys

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