feat(8-kyu): kata/grader

kata/8-kyu/grader/README.md

@@ -2,20 +2,21 @@
 
 Create a function that takes a number as an argument and returns a grade based on that number.
 
-Score | Grade
------------------------------------------|-----
-Anything greater than 1 or less than 0.6 | "F"
-0.9 or greater | "A"
-0.8 or greater | "B"
-0.7 or greater | "C"
-0.6 or greater | "D"
+| Score                                    | Grade |
+|------------------------------------------|-------|
+| Anything greater than 1 or less than 0.6 | "F"   |
+| 0.9 or greater                           | "A"   |
+| 0.8 or greater                           | "B"   |
+| 0.7 or greater                           | "C"   |
+| 0.6 or greater                           | "D"   |
 
 Examples:
+
 ```
 grader(0) should be "F"
 grader(1.1) should be "F"
 grader(0.9) should be "A"
 grader(0.8) should be "B"
 grader(0.7) should be "C"
 grader(0.6) should be "D"
-```
+```

kata/8-kyu/grader/main/Grader.java

@@ -0,0 +1,5 @@
+interface Grader {
+  static String grader(double score) {
+    return "FFFFFFDCBAAF".charAt((int) (score > 1 ? 11 : 10 * score)) + "";
+  }
+}

kata/8-kyu/grader/test/GraderTest.java

@@ -0,0 +1,20 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class GraderTest {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+       1.1, F
+         1, A
+       0.9, A
+      0.81, B
+       0.7, C
+       0.6, D
+      0.49, F
+      """)
+  void sample(double score, String grade) {
+    assertEquals(grade, Grader.grader(score));
+  }
+} 

kata/8-kyu/index.md

@@ -95,6 +95,7 @@
 - [Get Planet Name By ID](get-planet-name-by-id)
 - [Get the mean of an array](get-the-mean-of-an-array)
 - [Ghost code?!](ghost-code)
+- [Grader](grader)
 - [Grasshopper - Array Mean](grasshopper-array-mean)
 - [Grasshopper - Basic Function Fixer](grasshopper-basic-function-fixer)
 - [Grasshopper - Check for factor](grasshopper-check-for-factor)