WillowScript (.ws) is a proposed, not-yet-implemented language. Examples and library integrations here are illustrative design exercises, not verified runnable programs.

Validate an input before using it

A condition answers a yes-or-no question. Start with the rule in ordinary words, such as “a positive quantity is allowed,” then identify the exact comparison that represents it. The boundary is part of the rule: zero is different from a positive value.

1. 1

   Validate an input before using it — Discover and trace

   Make a prediction before touching the example.

   Open practice
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2. 2

   Validate an input before using it — Build the smallest useful slice

   Change one useful behavior while keeping the contract small.

   Open practice
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3. 3

   Validate an input before using it — Change one requirement

   Translate one new mod requirement into a deliberate change.

   Open practice
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4. 4

   Validate an input before using it — Boundary detective

   Find a case the simplest success path does not cover.

   Open practice
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5. 5

   Validate an input before using it — Flash-check repair

   Use a plausible mistake to show that you understand the mechanism.

   Open practice
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6. 6

   Validate an input before using it — Connect the previous skills

   Connect this idea with a previously learned responsibility.

   Open practice
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7. 7

   Validate an input before using it — Review and demonstrate

   Collect a useful learning record without pretending the code was executed.

   Open practice
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