Chapter 11: Forms and Validation

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A Simple Contact Form

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The Model

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Messages for User Input

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The Update Function

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The View

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Putting It Together

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When Validation Enters the Picture

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The Model Expands

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Validation Functions

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The Update Function Now Validates

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The View Gets Cluttered

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The Boilerplate Inventory

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Questions Worth Asking

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Finding the Right Abstraction

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What We Want

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The Shape of a Solution

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A Practical Example

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How Validators Work

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Composing Validators

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Input Transformation

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What This Abstraction Trades Away

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Phantom Types in Action

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What We Learned

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Up next

Chapter 12: Building a Feedback Wizard