This is an exam study question. I have to write a program in Ruby without mutati

Question

This is an exam study question. I have to write a program in Ruby without mutation (using functional operations):

Input: a text file:

-Each line is a record.

-Each record contains one or more fields.

-Each field is separated by a semi-colon.

Example (3 fields):

- 12345;this is the second field;3

-The first field is either:

-empty (empty string) or

-a valid number

Output:

• Print the record with the largest number in the first field

• If two records have the same value, output only the first

• Ignore records with an empty first field

• Output is empty if no records or only records with an empty field

Thanks for your help!

Explanation / Answer

In this class, not only does the update method change the state of the object, but we've exposed our attrs hash through a public attr_accessor, leaving it easily exposed for mutation in place. What's the problem? Well, maybe nothing if the scope of this object is localized enough so that everything using the object knows that it could change. But once the mutations leave a defined boundary, we've introduced more complexity to the codebase.

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