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Ruby program to implement setter method using 'attr_writer' accessor

Ruby Example: Write a program to implement setter method using 'attr_writer' accessor.
Submitted by Nidhi, on February 01, 2022

Problem Solution:

In this program, we will implement getter and setter methods using "attr_reader", "attr_writer" accessor to get/set the value of the instance variable.

Program/Source Code:

The source code to implement the setter method using the "attr_writer" accessor is given below. The given program is compiled and executed successfully.

# Ruby program to implement setter method using 
# 'attr_writer' accessor

class Sample
	# constructor
	def initialize(val)
		@ins_var = val;
	end
	
	# Getter method
	attr_reader:ins_var 
	
	# accessor set method
    attr_writer :ins_var
end

obj = Sample.new("Hello");

val = obj.ins_var;
print "Value is: ",val,"\n";

obj.ins_var = "Hii";
val = obj.ins_var;
print "Value is: ",val,"\n";

Output:

Value is: Hello
Value is: Hii

Explanation:

In the above program, we created a class Sample. In the Sample class, we implemented constructor and getter, setter methods using attr_reader, attr_writer accessor. Then we created the object of the Sample class with the initial value. After that, we used getter/setter methods to get/set the value of the ins_var variable and print the result.