[Solved] What is wrong with this code snippet? arr = [1, 2, 3] arr.freeze arr.push(4) puts arr.inspect — Ans: RuntimeError because push modifies frozen array | Ruby

Ruby - Functional Patterns in Ruby

What is wrong with this code snippet?

arr = [1, 2, 3]
arr.freeze
arr.push(4)
puts arr.inspect

ASyntaxError due to push method

BRuntimeError because push modifies frozen array

COutput is [1, 2, 3, 4]

DOutput is [1, 2, 3]

Step-by-Step Solution

Solution:

Step 1: Freeze the array
arr.freeze makes the array immutable.
Step 2: push attempts to modify array
arr.push(4) tries to add an element, causing RuntimeError.
Final Answer:
RuntimeError because push modifies frozen array -> Option B
Quick Check:
freeze + push = RuntimeError [OK]

Quick Trick: Modifying frozen arrays with push raises RuntimeError [OK]

Common Mistakes:

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