Given hash = {a: 1, b: nil, c: 3, d: nil}, which code removes all keys with nil values?

hard📝 Application Q9 of 15

Ruby - Variables and Data Types

Given hash = {a: 1, b: nil, c: 3, d: nil}, which code removes all keys with nil values?

Ahash.reject! { |k, v| v != nil }

Bhash.delete_if { |k, v| v.nil? }

Chash.select { |k, v| v.nil? }

Dhash.keep_if { |k, v| v.nil? }

Step-by-Step Solution

Solution:

Step 1: Understand delete_if method
delete_if removes key-value pairs matching the condition.
Step 2: Remove pairs where value is nil
Use v.nil? to identify nil values and delete those pairs.
Final Answer:
hash.delete_if { |k, v| v.nil? } -> Option B
Quick Check:
delete_if removes nil values = C [OK]

Quick Trick: Use delete_if with .nil? to clean hashes [OK]

Common Mistakes:

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