Ruby - Class Methods and Variables
How can you safely modify a frozen hash
h = {x: 1, y: 2}.freeze by adding a new key-value pair?How can you safely modify a frozen hash h = {x: 1, y: 2}.freeze by adding a new key-value pair?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Recognize frozen hash cannot be changed
Direct modification likeh[:z] = 3or mutating methods likemerge!orupdateraises error.Step 2: Use non-destructive merge method
h.merge(z: 3)returns a new hash with added pair, original remains frozen.Final Answer:
h.merge(z: 3) -> Option DQuick Check:
Modify frozen hash safely = merge returns new hash [OK]
Quick Trick: Use merge to add keys without modifying frozen hash [OK]
Common Mistakes:
- Trying to update frozen hash directly
- Using mutating merge! on frozen hash
- Expecting update to work on frozen hash
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