Ruby - Hashes
Why do Ruby hashes allow keys of many types (symbols, strings, numbers) but symbols are preferred?
Why do Ruby hashes allow keys of many types (symbols, strings, numbers) but symbols are preferred?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand symbol properties
Symbols are immutable and reused, so they save memory and speed up key comparisons.Step 2: Compare with strings and numbers
Strings are mutable and create new objects, numbers can be keys but symbols are more efficient for identifiers.Final Answer:
Symbols are immutable and memory-efficient keys -> Option AQuick Check:
Symbols = efficient, immutable keys = A [OK]
Quick Trick: Use symbols as keys for efficiency and immutability [OK]
Common Mistakes:
MISTAKES- Thinking strings are faster than symbols
- Believing numbers cannot be keys
- Assuming symbols convert to strings automatically
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