name-badge
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{
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"authors": [
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"angelikatyborska"
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],
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"contributors": [
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"neenjaw"
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],
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"files": {
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"solution": [
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"lib/name_badge.ex"
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],
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"test": [
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"test/name_badge_test.exs"
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],
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"exemplar": [
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".meta/exemplar.ex"
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]
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},
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"language_versions": ">=1.10",
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"forked_from": [
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"csharp/tim-from-marketing"
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],
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"icon": "tim-from-marketing",
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"blurb": "Learn about nil and the if conditional expression by printing name badges for factory employees."
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}
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{"track":"elixir","exercise":"name-badge","id":"c0cda396046043c99b8b51ee9773dc08","url":"https://exercism.org/tracks/elixir/exercises/name-badge","handle":"negrienko","is_requester":true,"auto_approve":false}
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# Used by "mix format"
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[
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inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
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]
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# The directory Mix will write compiled artifacts to.
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/_build/
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# If you run "mix test --cover", coverage assets end up here.
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/cover/
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# The directory Mix downloads your dependencies sources to.
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/deps/
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# Where third-party dependencies like ExDoc output generated docs.
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/doc/
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# Ignore .fetch files in case you like to edit your project deps locally.
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/.fetch
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# If the VM crashes, it generates a dump, let's ignore it too.
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erl_crash.dump
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# Also ignore archive artifacts (built via "mix archive.build").
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*.ez
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# Ignore package tarball (built via "mix hex.build").
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nil-*.tar
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# Help
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## Running the tests
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From the terminal, change to the base directory of the exercise then execute the tests with:
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```bash
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$ mix test
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```
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This will execute the test file found in the `test` subfolder -- a file ending in `_test.exs`
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Documentation:
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* [`mix test` - Elixir's test execution tool](https://hexdocs.pm/mix/Mix.Tasks.Test.html)
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* [`ExUnit` - Elixir's unit test library](https://hexdocs.pm/ex_unit/ExUnit.html)
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## Pending tests
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In test suites of practice exercises, all but the first test have been tagged to be skipped.
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Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.
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For example:
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```elixir
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# @tag :pending
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test "shouting" do
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assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
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end
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```
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If you wish to run all tests at once, you can include all skipped test by using the `--include` flag on the `mix test` command:
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```bash
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$ mix test --include pending
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```
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Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the file `test/test_helper.exs`.
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```elixir
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# ExUnit.configure(exclude: :pending, trace: true)
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```
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## Useful `mix test` options
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* `test/<FILE>.exs:LINENUM` - runs only a single test, the test from `<FILE>.exs` whose definition is on line `LINENUM`
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* `--failed` - runs only tests that failed the last time they ran
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* `--max-failures` - the suite stops evaluating tests when this number of test failures
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is reached
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* `--seed 0` - disables randomization so the tests in a single file will always be ran
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in the same order they were defined in
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## Submitting your solution
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You can submit your solution using the `exercism submit lib/name_badge.ex` command.
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This command will upload your solution to the Exercism website and print the solution page's URL.
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It's possible to submit an incomplete solution which allows you to:
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- See how others have completed the exercise
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- Request help from a mentor
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## Need to get help?
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If you'd like help solving the exercise, check the following pages:
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- The [Elixir track's documentation](https://exercism.org/docs/tracks/elixir)
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- The [Elixir track's programming category on the forum](https://forum.exercism.org/c/programming/elixir)
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- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
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- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
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Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
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If you're stuck on something, it may help to look at some of the [available resources](https://exercism.org/docs/tracks/elixir/resources) out there where answers might be found.
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# Hints
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## General
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- Read about `if` in the official [Getting Started guide][getting-started-if-unless] or on [elixirschool.com][elixirschool-if-unless].
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## 1. Print a badge for an employee
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- This is a base case where we can assume that none of the input data is `nil`.
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- If you need to refresh your memory about working with strings, read about them in the official [Getting Started guide][getting-started-basic-strings].
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## 2. Print a badge for a new employee
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- Strings are always _truthy_ and `nil` is _falsy_.
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- There is a [macro][kernel-if] that returns one of the two options, depending of whether it was given a _truthy_ or a _falsy_ value.
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## 3. Print a badge for the owner
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- Strings are always _truthy_ and `nil` is _falsy_.
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- There is a [macro][kernel-if] that returns one of the two options, depending of whether it was given a _truthy_ or a _falsy_ value.
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[kernel-if]: https://hexdocs.pm/elixir/Kernel.html#if/2
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[getting-started-basic-strings]: https://elixir-lang.org/getting-started/basic-types.html#strings
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[getting-started-if-unless]: https://elixir-lang.org/getting-started/case-cond-and-if.html#if-and-unless
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[elixir-school-if-unless]: https://elixirschool.com/en/lessons/basics/control-structures/#if-and-unless
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# Name Badge
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Welcome to Name Badge on Exercism's Elixir Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
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## Introduction
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## Nil
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[Nil][nil-dictionary] is an English word meaning "nothing" or "zero". In Elixir, `nil` is a special value that means an _absence_ of a value.
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```elixir
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# I do not have a favorite color
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favorite_color = nil
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```
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In other programming languages, `null` or `none` values might play a similar role.
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## If
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Besides `cond`, Elixir also provides the macro [`if/2`][getting-started-if-unless] which is useful when you need to check for only one condition.
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[`if/2`][kernel-if] accepts a condition and two options. It returns the first option if the condition is _truthy_, and the second option if the condition is _falsy_.
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```elixir
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age = 15
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if age >= 16 do
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"You are allowed to drink beer in Germany."
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else
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"No beer for you!"
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end
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# => "No beer for you!"
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```
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It is also possible to write an `if` expression on a single line. Note the comma after the condition.
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```elixir
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if age > 16, do: "beer", else: "no beer"
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```
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This syntax is helpful for very short expressions, but should be avoided if the expression won't fit on a single line.
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### _Truthy_ and _falsy_
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In Elixir, all datatypes evaluate to a _truthy_ or _falsy_ value when they are encountered in a boolean context (like an `if` expression). All data is considered _truthy_ **except** for `false` and `nil`. In particular, empty strings, the integer `0`, and empty lists are all considered _truthy_ in Elixir.
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[nil-dictionary]: https://www.merriam-webster.com/dictionary/nil
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[getting-started-if-unless]: https://elixir-lang.org/getting-started/case-cond-and-if.html#if-and-unless
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[kernel-if]: https://hexdocs.pm/elixir/Kernel.html#if/2
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## Instructions
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In this exercise you'll be writing code to print name badges for factory employees. Employees have an ID, name, and department name. Employee badge labels are formatted as follows: `"[id] - name - DEPARTMENT"`.
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## 1. Print a badge for an employee
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Implement the `NameBadge.print/3` function. It should take an id, name, and a department. It should return the badge label, with the department name in uppercase.
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```elixir
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NameBadge.print(67, "Katherine Williams", "Strategic Communication")
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# => "[67] - Katherine Williams - STRATEGIC COMMUNICATION"
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```
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## 2. Print a badge for a new employee
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Due to a quirk in the computer system, new employees occasionally don't yet have an ID when they start working at the factory. As badges are required, they will receive a temporary badge without the ID prefix.
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Extend the `NameBadge.print/3` function. When the id is missing, it should print a badge without it.
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```elixir
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NameBadge.print(nil, "Robert Johnson", "Procurement")
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# => "Robert Johnson - PROCUREMENT"
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```
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## 3. Print a badge for the owner
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Even the factory's owner has to wear a badge at all times. However, an owner does not have a department. In this case, the label should print `"OWNER"` instead of the department name.
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Extend the `NameBadge.print/3` function. When the department is missing, assume the badge belongs to the company owner.
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```elixir
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NameBadge.print(204, "Rachel Miller", nil)
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# => "[204] - Rachel Miller - OWNER"
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```
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Note that it is possible for the owner to also be a new employee.
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```elixir
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NameBadge.print(nil, "Rachel Miller", nil)
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# => "Rachel Miller - OWNER"
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```
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## Source
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### Created by
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- @angelikatyborska
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### Contributed to by
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- @neenjaw
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defmodule NameBadge do
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def print(id, name, department) do
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d = if department, do: String.upcase(department), else: "OWNER"
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if id do
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"[#{id}] - #{name} - #{d}"
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else
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"#{name} - #{d}"
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end
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end
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end
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defmodule NameBadge.MixProject do
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use Mix.Project
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def project do
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[
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app: :name_badge,
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version: "0.1.0",
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# elixir: "~> 1.10",
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start_permanent: Mix.env() == :prod,
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deps: deps()
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]
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end
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# Run "mix help compile.app" to learn about applications.
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def application do
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[
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extra_applications: [:logger]
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]
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end
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# Run "mix help deps" to learn about dependencies.
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defp deps do
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[
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# {:dep_from_hexpm, "~> 0.3.0"},
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# {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
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]
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end
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end
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defmodule NameBadgeTest do
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use ExUnit.Case
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doctest NameBadge
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describe "print/3" do
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@tag task_id: 1
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test "prints the employee badge with full data" do
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assert NameBadge.print(455, "Mary M. Brown", "MARKETING") ==
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"[455] - Mary M. Brown - MARKETING"
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end
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@tag task_id: 1
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test "uppercases the department" do
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assert NameBadge.print(89, "Jack McGregor", "Procurement") ==
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"[89] - Jack McGregor - PROCUREMENT"
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end
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@tag task_id: 2
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test "prints the employee badge without id" do
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assert NameBadge.print(nil, "Barbara White", "Security") == "Barbara White - SECURITY"
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end
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@tag task_id: 3
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test "prints the owner badge" do
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assert NameBadge.print(1, "Anna Johnson", nil) == "[1] - Anna Johnson - OWNER"
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end
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@tag task_id: 3
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test "prints the owner badge without id" do
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assert NameBadge.print(nil, "Stephen Dann", nil) == "Stephen Dann - OWNER"
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end
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end
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end
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ExUnit.start()
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ExUnit.configure(exclude: :pending, trace: true, seed: 0)
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