feat(7-kyu): kata/from-a-to-z (#437)

ParanoidUser · Oct 3, 2023 · 2abefd3 · 2abefd3
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diff --git a/docs/README.md b/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) |
 |:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:-----------------------------:|:---------------------------:|:---------------------------------:|
-|               -               |               1               |               2               |              22               |              40               |              412              |              549              |              202              |             57              |                76                 |
+|               -               |               1               |               2               |              22               |              40               |              412              |              550              |              202              |             57              |                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/from-a-to-z/README.md b/kata/7-kyu/from-a-to-z/README.md
@@ -0,0 +1,20 @@
+# [From A to Z](https://www.codewars.com/kata/from-a-to-z "https://www.codewars.com/kata/6512b3775bf8500baea77663")
+
+Given a string indicating a range of letters, return a string which includes all the letters in that
+range, *including* the last letter. Note that if the range is given in *capital letters*, return the
+string in capitals also!
+
+### Examples
+
+```
+"a-z" ➞ "abcdefghijklmnopqrstuvwxyz"
+"h-o" ➞ "hijklmno"
+"Q-Z" ➞ "QRSTUVWXYZ"
+"J-J" ➞ "J"
+```
+
+### Notes
+
+- A *hyphen* will separate the two letters in the string.
+- You don't need to worry about error handling in this one (i.e. both letters will be the same case
+  and the second letter will always be after the first alphabetically).
diff --git a/kata/7-kyu/from-a-to-z/main/Solution.java b/kata/7-kyu/from-a-to-z/main/Solution.java
@@ -0,0 +1,6 @@
+interface Solution {
+  static String gimmeTheLetters(String s) {
+    var az = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    return az.substring(az.indexOf(s.charAt(0)), az.indexOf(s.charAt(2)) + 1);
+  }
+}
diff --git a/kata/7-kyu/from-a-to-z/test/SolutionTest.java b/kata/7-kyu/from-a-to-z/test/SolutionTest.java
@@ -0,0 +1,25 @@
+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 = """
+          a-z, abcdefghijklmnopqrstuvwxyz
+          h-o, hijklmno
+          Q-Z, QRSTUVWXYZ
+          J-J, J
+          a-b, ab
+          a-a, a
+          g-i, ghi
+          H-I, HI
+          y-z, yz
+          e-k, efghijk
+          a-q, abcdefghijklmnopq
+          F-O, FGHIJKLMNO
+      """)
+  void sample(String s, String ans) {
+    assertEquals(ans, Solution.gimmeTheLetters(s));
+  }
+}
diff --git a/kata/7-kyu/index.md b/kata/7-kyu/index.md
@@ -189,6 +189,7 @@
 - [Formatting decimal places #1](formatting-decimal-places-number-1)
 - [Four/Seven](four-slash-seven)
 - [Friends](friends)
+- [From A to Z](from-a-to-z)
 - [Fun with lists: anyMatch + allMatch](fun-with-lists-anymatch-plus-allmatch)
 - [Fun with lists: indexOf](fun-with-lists-indexof)
 - [Fun with lists: lastIndexOf](fun-with-lists-lastindexof)