44 lines
2.0 KiB
Markdown
44 lines
2.0 KiB
Markdown
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# Hints
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## General
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- Read about [structs][getting-started-structs] in the Getting Started guide.
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- Read about [`defstruct`][docs-defstruct] in the documentation.
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- Watch [Elixir Casts - #106: Intro to Structs][elixir-casts].
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## 1. Create a brand-new remote controlled car
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- The module attribute `@enforce_keys` can be used to specify required values. It needs to be defined before calling `defstruct`.
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- The `nickname` field should not have a default value specified.
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- The `new/0` function should initialize the `nickname` with the value `"none"`.
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## 2. Create a brand-new remote controlled car with a nickname
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- Use [`multiple-function-clauses`][multiple-fn-clauses] to reuse the function name but accept different arguments.
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- Consider a [`default-argument`][default-arg] for the function.
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## 3. Display the distance
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- For functions which accept only a specific type of struct, make sure you perform a pattern match to check the argument.
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- Use the _static access operator_ to obtain field values.
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## 4. Display the battery percentage
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- For functions which accept only a specific type of struct, make sure you perform a pattern match to check the argument.
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- Use the _static access operator_ to obtain field values.
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## 5. Driving changes the battery and distance driven
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- For functions which accept only a specific type of struct, make sure you perform a pattern match to check the argument.
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- Use the _static access operator_ to obtain field values.
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- Review the introduction for updating structs.
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## 6. Account for driving with a dead battery
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- If the battery is dead, it should return the struct unchanged.
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[getting-started-structs]: https://elixir-lang.org/getting-started/structs.html
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[docs-defstruct]: https://hexdocs.pm/elixir/Kernel.html#defstruct/1
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[elixir-casts]: https://elixircasts.io/intro-to-structs
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[multiple-fn-clauses]: https://elixir-lang.org/getting-started/modules-and-functions.html#named-functions
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[default-arg]: https://elixir-lang.org/getting-started/modules-and-functions.html#default-arguments
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