[Solved] What will be the output of this Ruby code? arr = [1, 2, 3] arr.freeze arr — Ans: RuntimeError: can't modify frozen Array | Ruby

Ruby - Class Methods and Variables

What will be the output of this Ruby code?

arr = [1, 2, 3]
arr.freeze
arr << 4
puts arr.inspect

ARuntimeError: can't modify frozen Array

B[1, 2, 3, 4]

C[1, 2, 3]

DSyntaxError

Step-by-Step Solution

Solution:

Step 1: Understand freezing the array
The array arr is frozen with arr.freeze, so it cannot be changed.
Step 2: Analyze the modification attempt
The code tries to add an element with arr << 4, which modifies the array. Since it's frozen, this raises a runtime error.
Final Answer:
RuntimeError: can't modify frozen Array -> Option A
Quick Check:
Modifying frozen object = RuntimeError [OK]

Quick Trick: Modifying frozen objects causes runtime errors [OK]

Common Mistakes:

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