Ruby - String Operations
How can you replace all digits in a string with '#' but only if the digit is odd, using Ruby's
gsub method?How can you replace all digits in a string with '#' but only if the digit is odd, using Ruby's gsub method?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Identify pattern for odd digits
The regex /[13579]/ matches all odd digits.Step 2: Use gsub to replace all matches
Usinggsubwith this pattern replaces every odd digit with '#'.Step 3: Check other options
string.gsub(/[0-9]/, '#') replaces all digits; string.gsub(/[02468]/, '#') matches even digits; string.sub(/[13579]/, '#') uses sub (only first match).Final Answer:
string.gsub(/[13579]/, '#') -> Option CQuick Check:
gsub with odd digit regex = D [OK]
Quick Trick: Use regex with gsub to target specific characters [OK]
Common Mistakes:
- Using sub instead of gsub for all replacements
- Using wrong regex for odd digits
- Replacing all digits instead of only odd ones
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