Ruby program to make string immutable

Program/Source Code:

The source code to make the string immutable is given below. The given program is compiled and executed successfully.

# Ruby program to make string immutable

str = "Hello ";

str = str<< "World";

print str;

str.freeze();

#Below state will generate error.
#str = str<< " Hello Again";

Output:

Hello World

Explanation:

In the above program, we used the freeze() method with a string. The freeze() method is used to make a string immutable. After calling the freeze() method with string, we cannot modify the string variable.