Chapter 9: Organizing Files and Modules

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Moving Beyond the Single-File Approach?

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JavaScript Pain Point I: “Sneaky Mutations”

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JavaScript Pain Point II: Refactoring is Hard and Quite Dangerous

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Elm is Different

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Let’s Build an Advent Calendar App

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Basic Advent Calendar Spec

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Starting Simple: The Mock Date Version

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Properly Typed Business Logic

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The View Layer

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Getting the Real Date: Enter Tasks

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What is a Task?

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The Changes We Made

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Building the Task

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The Result

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When to Split: Modules for Data Structures

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The Freedom of Safe Refactoring

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What We’ve Learned

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Chapter 10: Modules Around Data Structures