Which of the following is the correct syntax to check if variable obj is exactly an instance of class String?

easy📝 Syntax Q3 of 15

Ruby - Variables and Data Types

Which of the following is the correct syntax to check if variable obj is exactly an instance of class String?

Aobj.is_a?(String)

Bobj.instance_of?(String)

Cobj.class(String)

Dobj.kind_of?(String)

Step-by-Step Solution

Solution:

Step 1: Understand exact class check
.instance_of? returns true only if the object is exactly of the given class, not subclass.
Step 2: Compare with other options
.is_a? and .kind_of? allow subclasses; .class == String works but is less idiomatic.
Final Answer:
obj.instance_of?(String) -> Option B
Quick Check:
Exact class check uses .instance_of? [OK]

Quick Trick: Use .instance_of? for exact class match [OK]

Common Mistakes:

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