feat: kata/summing-a-numbers-digits

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 | 445 | 607 | 228 | 59 | 82 |
+| 0 | 1 | 2 | 26 | 48 | 445 | 608 | 228 | 59 | 82 |
 
 **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

@@ -530,6 +530,7 @@
 - [Sum of Triangular Numbers](sum-of-triangular-numbers "580878d5d27b84b64c000b51")
 - [Sum of two lowest positive integers](sum-of-two-lowest-positive-integers "558fc85d8fd1938afb000014")
 - [Summation Triangle #1](summation-triangle-number-1 "6357825a00fba284e0189798")
+- [Summing a number's digits](summing-a-numbers-digits "52f3149496de55aded000410")
 - [Supernatural](supernatural "55c9a8cda33889d69e00008b")
 - [Survive the attack](survive-the-attack "634d0f7c562caa0016debac5")
 - [Suzuki needs help lining up his students!](suzuki-needs-help-lining-up-his-students "5701800886306a876a001031")

kata/7-kyu/summing-a-numbers-digits/README.md

@@ -0,0 +1,13 @@
+# [Summing a number's digits](https://www.codewars.com/kata/summing-a-numbers-digits "https://www.codewars.com/kata/52f3149496de55aded000410")
+
+Write a function which takes a number as input and returns the sum of the absolute value of each of the number's decimal digits. 
+
+For example: (**Input --> Output**)
+
+```
+10 --> 1
+99 --> 18
+-32 --> 5
+```
+
+Let's assume that all numbers in the input will be integer values.

kata/7-kyu/summing-a-numbers-digits/main/Kata.java

@@ -0,0 +1,5 @@
+interface Kata {
+  static int sumDigits(int number) {
+    return (Math.abs(number) + "").chars().reduce(0, (s, i) -> s + i - 48);
+  }
+}

kata/7-kyu/summing-a-numbers-digits/test/SolutionTest.java

@@ -0,0 +1,16 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class SolutionTest {
+  @ParameterizedTest
+  @CsvSource(textBlock = """
+       10, 1
+       99, 18
+      -32, 5
+      """)
+  void sample(int number, int expected) {
+    assertEquals(expected, Kata.sumDigits(number));
+  }
+}