Improving the Phone Book Application I
Explore how to improve a phone book application in Go by implementing insert and delete commands, managing CSV data input and output, and using maps for indexing. Understand techniques for reading and writing CSV files with Go's encoding/csv package, apply regex for phone number validation, and incorporate a last visited field to enhance functionality.
It is time to update the phone book application. The new version of the phone book utility has the following improvements:
Support for the
insertanddeletecommandsAbility to read data from a file and write it before it exits
Each entry has a “last visited” field that is updated
Has a database index that is implemented using a Go map
Uses regular expressions to verify the phone numbers read
Working with CSV files
Most of the time, we do not want to lose our data or have to begin without any data every time we execute our application. There exist many techniques for doing so—the easiest one is by saving our data locally. A very easy-to-work-with format is CSV, which is what’s explained here and used in the phone book application later on. The good thing is ...