Ruby - Error Handling
You want to open a file, write data, and always close it even if an error occurs. Which Ruby code correctly uses
ensure for this cleanup?You want to open a file, write data, and always close it even if an error occurs. Which Ruby code correctly uses ensure for this cleanup?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct use of ensure for cleanup
file = File.open('data.txt', 'w') begin file.write('Hello') ensure file.close end opens the file beforebegin, writes inside, and closes inensure, guaranteeing closure.Step 2: Check other options for errors
begin file = File.open('data.txt', 'w') file.write('Hello') rescue file.close end closes in rescue, which only runs on errors, not always. file = File.open('data.txt', 'w') file.write('Hello') file.close doesn't handle errors. begin file = File.open('data.txt', 'w') file.write('Hello') ensure file = nil end sets file to nil but doesn't close it.Final Answer:
file = File.open('data.txt', 'w') begin file.write('Hello') ensure file.close end -> Option CQuick Check:
Ensure always closes file [OK]
Quick Trick: Put cleanup like file.close inside ensure [OK]
Common Mistakes:
- Closing file only in rescue block
- Not closing file on error
- Setting variable to nil instead of closing
Master "Error Handling" in Ruby
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