38 lines
1.8 KiB
Markdown
38 lines
1.8 KiB
Markdown
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# Hints
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## General
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- Read about using `with` in the [official Getting Started guide][getting-started-with].
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- Review the functions available in the [`NaiveDateTime` module][naive-date-time], the [`Date` module][date], and the [`Time` module][time].
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## 1. Get into the building
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- Match the `:ok` tuple returned by `enter_building/1` in `with` with `<-`.
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- In the `do` part of `with`, return an `:ok` tuple with the value you just matched.
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- Since you don't need to modify the error, you don't need an `else` block.
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## 2. Go to the information desk and find which counter you should go to
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- Match the `:ok` tuple returned by `find_counter_information/1` in `with` with `<-`.
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- Apply the anonymous function your just matched and match the result with `<-`.
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- In the `do` part of `with`, return an `:ok` tuple with the counter you obtained.
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- Add an `else` block that will expect a `:coffee_break` tuple and return a `:retry` tuple with a `NaiveDateTime`.
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- A minute has `60` seconds.
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- There is a [built-in function][naive-date-time-add] that adds a given number of seconds to a `NaiveDateTime` struct.
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- Other errors should be returned as they are.
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## 3. Go to the counter and get your form stamped
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- Match the `:ok` tuple returned by `stamp_form/3` in `with` with `<-`.
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- In the `do` part of `with`, return an `:ok` tuple with the checksum.
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## 4. Receive your new passport
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- In the `do` part of `with`, use `get_new_passport_number/3` and return the result in an `:ok` tuple.
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[with]: https://hexdocs.pm/elixir/Kernel.SpecialForms.html#with/1
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[getting-started-with]: https://hexdocs.pm/elixir/docs-tests-and-with.html#with
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[naive-date-time]: https://hexdocs.pm/elixir/NaiveDateTime.html
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[time]: https://hexdocs.pm/elixir/Time.html
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[date]: https://hexdocs.pm/elixir/Date.html
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[naive-date-time-add]: https://hexdocs.pm/elixir/NaiveDateTime.html#add/3
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