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J277 2.3.1

Defensive Design

TermDefinition
Comments Useful for explaining what the key features of a program are and to help programmers understand what to do
Indentation Used to separate different statements in a program. For example, the code within a loop, or a selection statement
Input sanitisation Removing any unwanted characters before data through the program
Input validation Checking if data meets certain criteria before passing it into the program
Whitelist A list of all data that a program should accept– any data that isn't on the whitelist will be rejected
Blacklist A list of the data that a program should reject – any data that isn't on the blacklist will be accepted
Defensive design Helps to ensure programs function properly with clever design
Authentication Can confirm the identity of a user before they're allowed to access certain pieces of data or features of the program.
Maintainability Making code easily to read and follow e.g. using comments, indentation and sensible variable names
Anticipating misuse Identifying and preparing for potential incorrect or unintended usage of a program e.g. false inputs
Naming conventions Agreed guidelines for naming variables and functions
Sensible Variable names A method of maintainability where you use variable names that are easy to understand
Range check Checking to see if an input is within a certain range
Length check Checking to see if an input is a required length
Presence Check Checking to see if something is present i.e. an input is filled in
Format check Checking the format of an input e.g. a postcode or date of birth
Created by: weirdog
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