Ruby - Metaprogramming Fundamentals
Which of the following correctly retrieves the value of the instance variable
@age from an object person?Which of the following correctly retrieves the value of the instance variable @age from an object person?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify method to get instance variable
The method to retrieve an instance variable's value by name is instance_variable_get, which takes the variable name as a symbol or string.Step 2: Check syntax correctness
person.instance_variable_get(:@age) uses person.instance_variable_get(:@age), which is correct. person.instance_variable_set(:@age) tries to set, not get. person.get_instance_variable(:age) uses a non-existent method. person.@age is invalid syntax.Final Answer:
person.instance_variable_get(:@age) -> Option CQuick Check:
instance_variable_get retrieves value [OK]
Quick Trick: Use instance_variable_get(:@var) to read instance variables [OK]
Common Mistakes:
- Using instance_variable_set instead of get
- Wrong method names like get_instance_variable
- Trying to access with dot notation
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