Which Ruby code snippet correctly creates a new array from arr without any nil values?

easy📝 Syntax Q3 of 15

Ruby - Arrays

Which Ruby code snippet correctly creates a new array from arr without any nil values?

arr = [4, nil, 7, nil, 9]

Anew_arr = arr.compact

Bnew_arr = arr.compact!

Cnew_arr = arr.delete(nil)

Dnew_arr = arr.reject(&:nil!)

Step-by-Step Solution

Solution:

Step 1: Identify method that returns new array
compact returns a new array without nil values, leaving original unchanged.
Step 2: Understand difference with compact!
compact! modifies the original array in place and returns nil if no changes were made.
Step 3: Analyze other options
arr.delete(nil) removes nil from original array and returns last deleted element, not a new array.
reject(&:nil!) is invalid syntax.
Final Answer:
new_arr = arr.compact -> Option A
Quick Check:
Check if original array remains unchanged and new array excludes nil [OK]

Quick Trick: Use compact to get new array without nils [OK]

Common Mistakes:

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