[Solved] You want to write a Ruby method process_items that takes an array and optionally a block.... Which code correctly implements this behavior? | Ruby

Ruby - Blocks, Procs, and Lambdas

You want to write a Ruby method process_items that takes an array and optionally a block. If a block is given, it should yield each item to the block; otherwise, it should return the array unchanged. Which code correctly implements this behavior?

Adef process_items(arr) arr.each { |item| yield item if block_given? } end

Bdef process_items(arr) if block_given? arr.each { |item| yield item } else arr end end

Cdef process_items(arr) if block_given arr.each { |item| yield item } else arr end end

Ddef process_items(arr) arr.each { |item| yield item } end

Step-by-Step Solution

Solution:

Step 1: Check block presence correctly
def process_items(arr) if block_given? arr.each { |item| yield item } else arr end end uses block_given? correctly to check if a block is passed before yielding.
Step 2: Handle both cases properly
If a block is given, it yields each item; otherwise, it returns the original array unchanged, matching the requirement.
Step 3: Review other options for errors
def process_items(arr) arr.each { |item| yield item } end always yields without checking block presence, causing error if no block given. def process_items(arr) if block_given arr.each { |item| yield item } else arr end end misses question mark in block_given. def process_items(arr) arr.each { |item| yield item if block_given? } end yields conditionally inside each, but block_given? inside the each block always returns false so no yielding occurs, though it returns the array.
Final Answer:
def process_items(arr) if block_given? arr.each { |item| yield item } else arr end end -> Option B
Quick Check:
Check block_given? before yield and return array if no block [OK]

Quick Trick: Check block_given? before yield; else return array [OK]

Common Mistakes:

Not checking block_given? before yield
Missing question mark in block_given
Returning nil instead of array when no block

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Which code correctly implements this behavior?

Step 1: Check block presence correctly

Step 2: Handle both cases properly

Step 3: Review other options for errors

Final Answer:

Quick Check:

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