Ruby - Class Methods and Variables
How can you reopen the Hash class to add a method
keys_to_strings that returns a new hash with all keys converted to strings?How can you reopen the Hash class to add a method keys_to_strings that returns a new hash with all keys converted to strings?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Correctly reopen Hash class
class Hash def keys_to_strings map { |k, v| [k.to_s, v] }.to_h end end reopens Hash and adds an instance method using valid syntax.Step 2: Verify method implementation
The method usesmapandto_hto convert keys to strings correctly.Final Answer:
class Hash def keys_to_strings map { |k, v| [k.to_s, v] }.to_h end end -> Option AQuick Check:
Reopen Hash with instance method for key conversion [OK]
Quick Trick: Use map and to_h inside reopened class methods [OK]
Common Mistakes:
- Defining class methods instead of instance methods
- Using module instead of class
Master "Class Methods and Variables" in Ruby
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