What does the Ruby expression [1, 2, 3] & [2, 3, 4] return?

easy📝 Conceptual Q2 of 15

Ruby - Arrays

What does the Ruby expression [1, 2, 3] & [2, 3, 4] return?

A[2, 3]

B[1, 2, 3, 4]

C[1, 4]

D[1, 2]

Step-by-Step Solution

Solution:

Step 1: Understand the & operator on arrays
The & operator returns the intersection of two arrays, elements common to both.
Step 2: Find common elements
Between [1, 2, 3] and [2, 3, 4], common elements are 2 and 3.
Final Answer:
The intersection is [2, 3] -> Option A
Quick Check:
Array intersection = & [OK]

Quick Trick: Use & to get common elements between arrays [OK]

Common Mistakes:

MISTAKES

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