[Solved] Identify the bug in this Ruby code:a = [1, 2, 3] b = [3, 4, 5] result = a + b - a puts result.inspect | Ruby

Ruby - Arrays

Identify the bug in this Ruby code:

a = [1, 2, 3]
b = [3, 4, 5]
result = a + b - a
puts result.inspect

AThe subtraction removes all elements of a, resulting in only b's unique elements

BThe + operator cannot be used with arrays

CThe code will raise a runtime error

DThe result will be empty array

Step-by-Step Solution

Solution:

Step 1: Understand the operations order
a + b concatenates arrays, then subtracting a removes all elements from a in the result.
Step 2: Analyze final array
After subtraction, only elements unique to b remain: [4, 5].
Final Answer:
Subtraction removes all elements of a, leaving b's unique elements -> Option A
Quick Check:
Array addition and subtraction combine and remove elements [OK]

Quick Trick: Addition concatenates, subtraction removes elements [OK]

Common Mistakes:

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