Check Boundary Conditions

Instructions

Systematically evaluate how code behaves at every boundary and extreme. Bugs cluster at edges—check them all before declaring code correct.

Step 1: Identify the Input Domain

For each parameter or input to the code under review, determine:

• Data type: number, string, array, object, boolean, date, etc.
• Valid range: What values are acceptable?
• Source: User input, API response, database query, config file?

Document the input domain: