Producing robust programs

Producing robust programs

1. Validation

   • Checking that data is valid and reasonable
   • Examples
     • range check
       • checking that the values fall between a certain range
     • length check
       • the input must be between a certain amount of characters
     • presence check
       • checking something is included (ie a value)
     • format check
       • checking it's in a specific format
     • type check
       • checking the type (integer etc)

2. Sanitation

3. Authentication

4. maintainability