[Solved] The following Ruby code is intended to add the line "Goodbye" to the end of log.txt. What is the error?File.open('log.txt', 'w') do |file| file.puts 'Goodbye' end | Ruby

Ruby - File IO

The following Ruby code is intended to add the line "Goodbye" to the end of log.txt. What is the error?

File.open('log.txt', 'w') do |file|
  file.puts 'Goodbye'
end

AThe file name should be in double quotes, not single quotes.

BUsing 'w' mode erases the file instead of appending.

CMissing a block parameter for the file object.

DThe method 'puts' cannot be used inside File.open.

Step-by-Step Solution

Solution:

Step 1: Identify the mode used
The code uses 'w' mode which overwrites the file content.
Step 2: Understand the intended action
To add content without erasing, 'a' mode should be used instead of 'w'.
Final Answer:
Using 'w' mode erases the file instead of appending. -> Option B
Quick Check:
Append needs 'a', not 'w' [OK]

Quick Trick: Use 'a' to add lines, 'w' erases file [OK]

Common Mistakes:

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The following Ruby code is intended to add the line "Goodbye" to the end of log.txt. What is the error?