feat(7-kyu): kata/simple-maths-test

docs/README.md

@@ -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 | 426 | 571 | 210 | 56 | 79 |
+| 0 | 1 | 2 | 26 | 48 | 426 | 572 | 210 | 56 | 79 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

kata/7-kyu/index.md

@@ -461,6 +461,7 @@
 - [Simple Fun #74: Growing Plant](simple-fun-number-74-growing-plant)
 - [Simple Fun #9: Array Packing](simple-fun-number-9-array-packing)
 - [Simple letter removal](simple-letter-removal)
+- [Simple Maths Test](simple-maths-test)
 - [Simple remove duplicates](simple-remove-duplicates)
 - [Simple Socket Client](simple-socket-client)
 - [Simple string characters](simple-string-characters)

kata/7-kyu/simple-maths-test/README.md

@@ -0,0 +1,24 @@
+# [Simple Maths Test](https://www.codewars.com/kata/simple-maths-test "https://www.codewars.com/kata/5507309481b8bd3b7e001638")
+
+Create a function which checks a number for three different properties.
+
+- is the number prime?
+- is the number even?
+- is the number a multiple of 10?
+
+Each should return either true or false, which should be given as an array.
+
+### Examples
+
+```
+SimpleMath.numberProperty(7)  => new boolean[] {true, false, false}
+SimpleMath.numberProperty(10) => new boolean[] {false, true, true}
+```
+
+The number will always be an integer, either positive or negative. Note that negative numbers cannot be primes, but
+they can be multiples of 10:
+
+```
+SimpleMath.numberProperty(-7)  => new boolean[] {false, false, false}
+SimpleMath.numberProperty(-10) => new boolean[] {false, true, true}
+```

kata/7-kyu/simple-maths-test/main/SimpleMath.java

@@ -0,0 +1,7 @@
+import static java.math.BigInteger.valueOf;
+
+interface SimpleMath {
+  static boolean[] numberProperty(int n) {
+    return new boolean[]{n > 0 && valueOf(n).isProbablePrime(9), n % 2 == 0, n % 10 == 0};
+  }
+}

kata/7-kyu/simple-maths-test/test/SimpleMathTests.java

@@ -0,0 +1,22 @@
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class SimpleMathTests {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+      -10, false, true, true
+      -2, false, true, false
+      0, false, true, true
+      1, false, false, false
+      2, true, true, false
+      120, false, true, true
+      125, false, false, false
+      139, true, false, false
+      341, false, false, false
+      """)
+  void sample(int n, boolean prime, boolean even, boolean decimal) {
+    assertArrayEquals(new boolean[]{prime, even, decimal}, SimpleMath.numberProperty(n));
+  }
+}