[Solved] What is the purpose of attr_writer in a Ruby class? — Ans: It creates a setter method for an instance variable. | Ruby

Ruby - Classes and Objects

What is the purpose of attr_writer in a Ruby class?

AIt deletes an instance variable.

BIt creates a setter method for an instance variable.

CIt creates both getter and setter methods for an instance variable.

DIt creates a getter method for an instance variable.

Step-by-Step Solution

Solution:

Step 1: Understand attr_writer functionality
attr_writer creates a setter method that allows you to assign a value to an instance variable from outside the class.
Step 2: Differentiate from attr_reader and attr_accessor
attr_reader creates only getter methods, attr_accessor creates both getter and setter methods.
Final Answer:
It creates a setter method for an instance variable. -> Option B
Quick Check:
attr_writer = setter method [OK]

Quick Trick: attr_writer lets you set values from outside the class [OK]

Common Mistakes:

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What is the purpose of attr_writer in a Ruby class?