Part III: Proving Things · Module 06

Discriminated Unions

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The single most useful pattern in the language, and it fixes the four states.

0/3 lessons · test not taken · project open

01

A Shared Field That Tells Branches Apart

~15 min · live editor

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02

Exhaustiveness

~13 min · live editor

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Practice Test

10 questions · 80% = mastery

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Typed Explorer Step 6: The Four States, Enforced

Apply everything from this module

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