You want to check if two variables x and y refer to the same object, but x might be nil. Which Ruby code safely performs this check without errors?

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Ruby - Classes and Objects

You want to check if two variables x and y refer to the same object, but x might be nil. Which Ruby code safely performs this check without errors?

Ax.equal?(y)

By.equals(x)

Cx&.equal?(y)

Dx == y

Step-by-Step Solution

Solution:

Step 1: Check safety of equal? on nil
In Ruby, nil is an object and responds to equal?, so x.equal?(y) is safe even if x is nil. It returns false unless y is also nil.
Step 2: Eliminate distractors
x&.equal?(y) returns nil if x is nil, which is not a proper boolean result. y.equals(x) calls a non-existent method. x == y checks content, not identity.
Final Answer:
x.equal?(y) -> Option A
Quick Check:
nil.equal?(y) safe boolean check = C [OK]

Quick Trick: Even nil.equal?(other) works without error [OK]

Common Mistakes:

Using &. which returns nil instead of boolean
Calling non-existent equals method
Using == which checks content, not identity

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More Ruby Quizzes

You want to check if two variables x and y refer to the same object, but x might be nil. Which Ruby code safely performs this check without errors?

Step 1: Check safety of equal? on nil

Step 2: Eliminate distractors

Final Answer:

Quick Check:

Want More Practice?

Step 1: Check safety of `equal?` on `nil`