feat: kata/remove-duplicates-from-list

docs/README.md

@@ -1,7 +1,7 @@
 # Codewars Handbook ☕️🚀
 
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@@ -25,7 +25,7 @@ slug.
 
 | [1 kyu](/kata/1-kyu/index.md) | [2 kyu](/kata/2-kyu/index.md) | [3 kyu](/kata/3-kyu/index.md) | [4 kyu](/kata/4-kyu/index.md) | [5 kyu](/kata/5-kyu/index.md) | [6 kyu](/kata/6-kyu/index.md) | [7 kyu](/kata/7-kyu/index.md) | [8 kyu](/kata/8-kyu/index.md) | [beta](/kata/beta/index.md) | [retired](/kata/retired/index.md) |
 |:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:---------------------------:|:---------------------------------:|
-| 0 | 1 | 2 | 26 | 48 | 430 | 578 | 216 | 56 | 79 |
+| 0 | 1 | 2 | 26 | 48 | 430 | 578 | 217 | 56 | 79 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

kata/8-kyu/index.md

@@ -171,6 +171,7 @@
 - [Quarter of the year](quarter-of-the-year)
 # R
 - [Regexp Basics - is it a digit?](regexp-basics-is-it-a-digit)
+- [Remove duplicates from list](remove-duplicates-from-list)
 - [Remove exclamation marks](remove-exclamation-marks)
 - [Remove First and Last Character](remove-first-and-last-character)
 - [Remove String Spaces](remove-string-spaces)

kata/8-kyu/remove-duplicates-from-list/README.md

@@ -0,0 +1,13 @@
+# [Remove duplicates from list](https://www.codewars.com/kata/remove-duplicates-from-list "https://www.codewars.com/kata/57a5b0dfcf1fa526bb000118")
+
+Define a function that removes duplicates from an array of non-negative numbers and returns it as a result.
+
+The order of the sequence has to stay the same.
+
+Examples:
+
+```
+Input -> Output
+[1, 1, 2] -> [1, 2]
+[1, 2, 1, 1, 3, 2] -> [1, 2, 3]
+```

kata/8-kyu/remove-duplicates-from-list/main/Solution.java

@@ -0,0 +1,7 @@
+import static java.util.stream.IntStream.of;
+
+interface Solution {
+  static int[] distinct(int[] array) {
+    return of(array).distinct().toArray();
+  }
+}

kata/8-kyu/remove-duplicates-from-list/test/SolutionTest.java

@@ -0,0 +1,25 @@
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class SolutionTest {
+  private static Stream<Arguments> testData() {
+    return Stream.of(
+        Arguments.of(new int[0], new int[0]),
+        Arguments.of(new int[]{1}, new int[]{1}),
+        Arguments.of(new int[]{1, 2}, new int[]{1, 2}),
+        Arguments.of(new int[]{1, 1, 2}, new int[]{1, 2}),
+        Arguments.of(new int[]{1, 1, 1, 2, 3, 4, 5}, new int[]{1, 2, 3, 4, 5}),
+        Arguments.of(new int[]{1, 2, 2, 1, 3, 3, 1, 4, 2, 4, 5, 6, 7, 7, 7}, new int[]{1, 2, 3, 4, 5, 6, 7})
+    );
+  }
+
+  @ParameterizedTest
+  @MethodSource("testData")
+  void sample(int[] input, int[] expected) {
+    assertArrayEquals(expected, Solution.distinct(input));
+  }
+}