Defensive Design
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Items in this lesson
Slide 1 - Slide
Slide 2 - Slide
Slide 3 - Slide
Slide 4 - Slide
Slide 5 - Slide
Slide 6 - Mind map
Slide 7 - Slide
Slide 8 - Slide
Slide 9 - Slide
The last one or two digits of a code are used to check the other digits are correct
Checks the data is in the right format
Checks the data isn't too long or short
Looks up acceptable values in a table
Checks that data has been entered into a field
Checks that a value falls within a specified field.
Looks up words in a dictionary
Bar code readers
Date of birth - DD/MM/YY
Password needs to be at least 6 letters long
Only 7 possible days of the week
Entering the long card number when purchasing something online
Number of hours worked must be less than 50 and more than 0
Red lines to underline misspelt words
Slide 10 - Drag question
Slide 11 - Slide
Slide 12 - Mind map
Slide 13 - Slide
Provides Structure
Makes it easier to read/understand
Makes it easier to read/understand
Makes it easier to read/understand
Makes finding and updating functions easy
Groups together a function
Explain what the code does
Make the reader aware of any issues/bugs
