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1746 implement high scores exercise (exercism#2272)
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‎config.json‎

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"practices": [],
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"prerequisites": ["strings", "string-formatting"],
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"difficulty": 5
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},
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{
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"slug": "high-scores",
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"name": "High Scores",
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"uuid": "574d6323-5ff5-4019-9ebe-0067daafba13",
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"practices": ["lists", "classes", "for-loops"],
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"prerequisites" :["lists"],
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"difficulty": 2
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}
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],
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"foregone": []

‎exercises/practice/high-scores/.docs/instructions.md‎

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# Instructions
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Manage a game player's High Score list.
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Your task is to build a high-score component of the classic Frogger game, one of the highest selling and most addictive games of all time, and a classic of the arcade era.
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Your task is to write methods that return the highest score from the list, the last added score and the three highest scores.

‎exercises/practice/high-scores/.meta/config.json‎

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{
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"authors": [],
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"files": {
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"solution": [
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"src/main/java/HighScores.java"
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],
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"test": [
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"src/test/java/HighScoresTest.java"
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],
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"example": [
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".meta/src/reference/java/HighScores.java"
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]
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},
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"blurb": "Manage a player's High Score list.",
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"source": "Tribute to the eighties' arcade game Frogger"
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}

‎exercises/practice/high-scores/.meta/src/reference/java/HighScores.java‎

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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Optional;
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import java.util.stream.Collectors;
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class HighScores {
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private List<Integer> highScores;
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public HighScores(List<Integer> highScores) {
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this.highScores = new ArrayList<Integer>(highScores);
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}
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List<Integer> scores() {
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return new ArrayList<Integer>(highScores);
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}
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Integer latest() {
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return highScores.get(highScores.size() - 1);
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}
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Integer personalBest() {
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Optional<Integer> personalBest = highScores.stream().max(Comparator.naturalOrder());
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return personalBest.orElse(0);
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}
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List<Integer> personalTopThree() {
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return highScores.stream().sorted(Comparator.reverseOrder()).limit(3).collect(Collectors.toList());
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}
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}

‎exercises/practice/high-scores/.meta/tests.toml‎

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[1035eb93-2208-4c22-bab8-fef06769a73c]
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description = "List of scores"
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[6aa5dbf5-78fa-4375-b22c-ffaa989732d2]
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description = "Latest score"
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[b661a2e1-aebf-4f50-9139-0fb817dd12c6]
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description = "Personal best"
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[3d996a97-c81c-4642-9afc-80b80dc14015]
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description = "Top 3 scores -> Personal top three from a list of scores"
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[1084ecb5-3eb4-46fe-a816-e40331a4e83a]
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description = "Top 3 scores -> Personal top highest to lowest"
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[e6465b6b-5a11-4936-bfe3-35241c4f4f16]
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description = "Top 3 scores -> Personal top when there is a tie"
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[f73b02af-c8fd-41c9-91b9-c86eaa86bce2]
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description = "Top 3 scores -> Personal top when there are less than 3"
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[16608eae-f60f-4a88-800e-aabce5df2865]
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description = "Top 3 scores -> Personal top when there is only one"
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[2df075f9-fec9-4756-8f40-98c52a11504f]
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description = "Top 3 scores -> Latest score after personal top scores"
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[809c4058-7eb1-4206-b01e-79238b9b71bc]
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description = "Top 3 scores -> Scores after personal top scores"
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[ddb0efc0-9a86-4f82-bc30-21ae0bdc6418]
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description = "Top 3 scores -> Latest score after personal best"
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[6a0fd2d1-4cc4-46b9-a5bb-2fb667ca2364]
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description = "Top 3 scores -> Scores after personal best"

‎exercises/practice/high-scores/build.gradle‎

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apply plugin: "java"
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apply plugin: "eclipse"
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apply plugin: "idea"
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// set default encoding to UTF-8
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compileJava.options.encoding = "UTF-8"
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compileTestJava.options.encoding = "UTF-8"
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repositories {
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mavenCentral()
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}
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dependencies {
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testImplementation "junit:junit:4.13"
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testImplementation "org.assertj:assertj-core:3.15.0"
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}
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test {
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testLogging {
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exceptionFormat = 'full'
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showStandardStreams = true
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events = ["passed", "failed", "skipped"]
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}
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}

‎exercises/practice/high-scores/src/main/java/HighScores.java‎

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import java.util.List;
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class HighScores {
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public HighScores(List<Integer> highScores) {
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throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
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}
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List<Integer> scores() {
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throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
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}
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Integer latest() {
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throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
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}
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Integer personalBest() {
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throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
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}
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List<Integer> personalTopThree() {
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throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
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}
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}

‎exercises/practice/high-scores/src/test/java/HighScoresTest.java‎

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import java.util.Arrays;
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import org.junit.Test;
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import static org.assertj.core.api.Assertions.assertThat;
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public class HighScoresTest {
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@Test
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public void shouldReturnListOfScores() {
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HighScores highScores = new HighScores(Arrays.asList(30, 50, 20, 70));
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assertThat(Arrays.asList(30, 50, 20, 70)).isEqualTo(highScores.scores());
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}
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@Test
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@Ignore("Remove to run test")
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public void shouldReturnLatestAddedScore() {
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HighScores highScores = new HighScores(Arrays.asList(100, 0, 90, 30));
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assertThat(30).isEqualTo(highScores.latest());
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}
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@Test
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@Ignore("Remove to run test")
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public void shouldReturnPersonalBest() {
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HighScores highScores = new HighScores(Arrays.asList(40, 100, 70));
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assertThat(100).isEqualTo(highScores.personalBest());
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}
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@Test
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@Ignore("Remove to run test")
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public void shouldReturnPersonalTopThreeFromListOfScores() {
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HighScores highScores = new HighScores(Arrays.asList(10, 30, 90, 30, 100, 20, 10, 0, 30, 40, 40, 70, 70));
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assertThat(Arrays.asList(100, 90, 70)).isEqualTo(highScores.personalTopThree());
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}
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@Test
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@Ignore("Remove to run test")
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public void shouldReturnPersonalTopThreeSortedHighestToLowest() {
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HighScores highScores = new HighScores(Arrays.asList(20, 10, 30));
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assertThat(Arrays.asList(30, 20, 10)).isEqualTo(highScores.personalTopThree());
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}
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@Test
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@Ignore("Remove to run test")
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public void shouldReturnPersonalTopThreeWhenThereIsATie() {
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HighScores highScores = new HighScores(Arrays.asList(40, 20, 40, 30));
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assertThat(Arrays.asList(40, 40, 30)).isEqualTo(highScores.personalTopThree());
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}
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@Test
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@Ignore("Remove to run test")
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public void shouldReturnPersonalTopWhenThereIsLessThanThreeScores() {
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HighScores highScores = new HighScores(Arrays.asList(30, 70));
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assertThat(Arrays.asList(70, 30)).isEqualTo(highScores.personalTopThree());
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}
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@Test
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@Ignore("Remove to run test")
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public void shouldReturnPersonalTopWhenThereIsOnlyOneScore() {
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HighScores highScores = new HighScores(Arrays.asList(40));
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assertThat(Arrays.asList(40)).isEqualTo(highScores.personalTopThree());
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}
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@Test
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@Ignore("Remove to run test")
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public void callingLatestAfterPersonalTopThree() {
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HighScores highScores = new HighScores(Arrays.asList(70, 50, 20, 30));
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highScores.personalTopThree();
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assertThat(30).isEqualTo(highScores.latest());
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}
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@Test
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@Ignore("Remove to run test")
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public void callingScoresAfterPersonalTopThree() {
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HighScores highScores = new HighScores(Arrays.asList(30, 50, 20, 70));
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highScores.personalTopThree();
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assertThat(Arrays.asList(30, 50, 20, 70)).isEqualTo(highScores.scores());
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}
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@Test
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@Ignore("Remove to run test")
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public void callingLatestAfterPersonalBest() {
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HighScores highScores = new HighScores(Arrays.asList(20, 70, 15, 25, 30));
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highScores.personalBest();
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assertThat(30).isEqualTo(highScores.latest());
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}
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@Test
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@Ignore("Remove to run test")
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public void callingScoresAfterPersonalBest() {
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HighScores highScores = new HighScores(Arrays.asList(20, 70, 15, 25, 30));
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highScores.personalBest();
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assertThat(Arrays.asList(20, 70, 15, 25, 30)).isEqualTo(highScores.scores());
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}
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}

‎exercises/settings.gradle‎

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include 'practice:hangman'
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include 'practice:hexadecimal'
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include 'practice:hello-world'
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include 'practice:high-scores'
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include 'practice:house'
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include 'practice:isbn-verifier'
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include 'practice:isogram'

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