feat(7-kyu): kata/day-of-the-year (#455)

ParanoidUser · Oct 24, 2023 · b54d97f · b54d97f
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diff --git a/docs/README.md b/docs/README.md
@@ -1,7 +1,7 @@
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 | [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) |
 |:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:---------------------------:|:---------------------------------:|
-|               -               |               1               |               2               |              22               |              40               |              413              |              555              |              205              |             58              |                76                 |
+|               -               |               1               |               2               |              22               |              40               |              413              |              556              |              205              |             58              |                76                 |
 
 **Note:** The source code is written in Java 17 and may use language features that are incompatible
 with Java 8, 11.

diff --git a/kata/7-kyu/day-of-the-year/README.md b/kata/7-kyu/day-of-the-year/README.md
@@ -0,0 +1,17 @@
+# [Day of the Year](https://www.codewars.com/kata/day-of-the-year "https://www.codewars.com/kata/5a1ebe0d46d843454100004c")
+
+Work out what number day of the year it is.
+
+```
+toDayOfYear([1, 1, 2000]) => 1
+```
+
+The argument passed into the function is an array with the format `[D, M, YYYY]`,
+e.g. `[1, 2, 2000]` for February 1st, 2000 or `[22, 12, 1999]` for December 22nd, 1999.
+
+Don't forget to check for whether it's a [leap year](https://en.wikipedia.org/wiki/Leap_year)! Three
+criteria must be taken into account to identify leap years:
+
+- The year can be evenly divided by 4;
+- If the year can be evenly divided by 100, it is NOT a leap year, unless;
+- The year is also evenly divisible by 400. Then it is a leap year.
diff --git a/kata/7-kyu/day-of-the-year/main/DateToInt.java b/kata/7-kyu/day-of-the-year/main/DateToInt.java
@@ -0,0 +1,7 @@
+import static java.time.LocalDate.of;
+
+interface DateToInt {
+  static int toDayOfYear(int[] date) {
+    return of(date[2], date[1], date[0]).getDayOfYear();
+  }
+}
diff --git a/kata/7-kyu/day-of-the-year/test/SolutionTest.java b/kata/7-kyu/day-of-the-year/test/SolutionTest.java
@@ -0,0 +1,17 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SolutionTest {
+  @Test
+  void sample() {
+    assertEquals(145, DateToInt.toDayOfYear(new int[]{25, 5, 2022}));
+    assertEquals(137, DateToInt.toDayOfYear(new int[]{17, 5, 1991}));
+    assertEquals(295, DateToInt.toDayOfYear(new int[]{22, 10, 1990}));
+    assertEquals(1, DateToInt.toDayOfYear(new int[]{1, 1, 2001}));
+    assertEquals(1, DateToInt.toDayOfYear(new int[]{1, 1, 2000}));
+    assertEquals(365, DateToInt.toDayOfYear(new int[]{31, 12, 2003}));
+    assertEquals(366, DateToInt.toDayOfYear(new int[]{31, 12, 2004}));
+    assertEquals(60, DateToInt.toDayOfYear(new int[]{29, 2, 2008}));
+  }
+}
diff --git a/kata/7-kyu/index.md b/kata/7-kyu/index.md
@@ -117,6 +117,7 @@
 - [Currying functions: multiply all elements in an array](currying-functions-multiply-all-elements-in-an-array)
 - [Cyclops numbers](cyclops-numbers)
 # D
+- [Day of the Year](day-of-the-year)
 - [Debug Sum of Digits of a Number](debug-sum-of-digits-of-a-number)
 - [Decimal decomposition](decimal-decomposition)
 - [Decimal Time Conversion](decimal-time-conversion)