Bird
0
0

How can you efficiently read a large file line-by-line without loading all lines into memory at once?

hard📝 Application Q9 of 15
Ruby - File IO
How can you efficiently read a large file line-by-line without loading all lines into memory at once?
AUse File.readlines and process the array
BUse File.foreach with a block to process each line
CUse File.read and split by newline
DUse File.open.readlines without a block
Step-by-Step Solution
Solution:

  1. Step 1: Understand memory usage of File.readlines

    File.readlines loads entire file into memory, which is inefficient for large files.

  2. Step 2: Use File.foreach for line-by-line processing

    File.foreach reads one line at a time and yields it to a block, saving memory.

  3. Final Answer:

    Use File.foreach with a block to process each line -> Option B

  4. Quick Check:

    File.foreach reads line-by-line efficiently = A [OK]
Quick Trick: Use File.foreach for memory-efficient line reading [OK]
Common Mistakes:
  • Using File.readlines for large files causing memory issues
  • Splitting entire file content manually
  • Not using block with File.open for streaming

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Ruby Quizzes
Blocks, Procs, and Lambdas - Yield to execute blocks - Quiz 12easy Blocks, Procs, and Lambdas - Why blocks are fundamental to Ruby - Quiz 5medium Blocks, Procs, and Lambdas - Yield to execute blocks - Quiz 10hard Blocks, Procs, and Lambdas - Why blocks are fundamental to Ruby - Quiz 10hard Class Methods and Variables - Class instance variables as alternative - Quiz 11easy Class Methods and Variables - Class methods with self prefix - Quiz 3easy Enumerable and Collection Processing - Reject for inverse filtering - Quiz 1easy File IO - CSV library basics - Quiz 5medium Inheritance - Method overriding - Quiz 3easy Modules and Mixins - Why modules solve multiple inheritance - Quiz 14medium