📖 added challenge 11

Author: jamerrq

readme.md

@@ -1,5 +1,9 @@
 # Advent JS version 2023 🎄
 
+> [!NOTE]
+> Si este repositorio llega a 16+ estrellas, estaré desarrollando una librería
+> de npm para resolver los retos del [AdventJS](https://adventjs.dev/) 2023.
+
 Soluciones bizarras a los retos del [AdventJS](https://adventjs.dev/) 2023.
 
 El [AdventJS](https://adventjs.dev/) es un evento iniciativa de
@@ -25,6 +29,7 @@ Para esta versión estaré usando TypeScript, en su versión 5.3.2.
 | 08  | [**Ordenando el almacen**](https://adventjs.dev/es/challenges/2023/8)         |     🟠     | [TS](./src/challenges/08.ts) | [SPEC](./src/tests/08.spec.ts) |
 | 09  | [**Alterna las luces**](https://adventjs.dev/es/challenges/2023/9)            |     🟢     | [TS](./src/challenges/09.ts) | [SPEC](./src/tests/09.spec.ts) |
 | 10  | [**Crea tu propio árbol de navidad**](https://adventjs.dev/es/challenges/2023/10)       |     🟢     | [TS](./src/challenges/10.ts) | [SPEC](./src/tests/10.spec.ts) |
+| 11  | [**Los elfos estudiosos**](https://adventjs.dev/es/challenges/2023/11)       |     🟠     | [TS](./src/challenges/11.ts) | [SPEC](./src/tests/11.spec.ts) |
 
 ## Herramientas utilizadas 🛠️
 

src/challenges/11.ts

@@ -0,0 +1,23 @@
+export function getIndexsForPalindrome (word: string): [number, number] | [] | null {
+  let ans: [number, number] | [] | null = null
+  const wordLength = word.length
+  if ([...word].reverse().join('') === word) {
+    ans = []
+  } else {
+    // if swapping chars i and j makes the word a palindrome, return [i, j]
+    for (let i = 0; i < wordLength; i++) {
+      for (let j = i + 1; j < wordLength; j++) {
+        const wordArr = [...word]
+        const temp = wordArr[i]
+        wordArr[i] = wordArr[j]
+        wordArr[j] = temp
+        if (wordArr.join('') === wordArr.reverse().join('')) {
+          ans = [i, j]
+          break
+        }
+      }
+      if (ans !== null) break
+    }
+  }
+  return ans
+}

src/tests/11.spec.ts

@@ -0,0 +1,53 @@
+import { test, expectTypeOf, expect, describe } from 'vitest'
+import { getIndexsForPalindrome } from '../challenges/11'
+
+describe('Challenge #11', () => {
+  // test('Test #01', () => {
+  //   expectTypeOf(getIndexsForPalindrome).returns.toEqualTypeOf(typeForGetIndexsForPalindrome)
+  // })
+
+  // Test: getIndexsForPalindrome('anna')
+  test('Test #02', () => {
+    expect(getIndexsForPalindrome('anna')).toEqual([])
+  })
+
+  // Test: getIndexsForPalindrome('abab')
+  test('Test #03', () => {
+    expect(getIndexsForPalindrome('abab')).toEqual([0, 1])
+  })
+
+  // Test: getIndexsForPalindrome('abac')
+  test('Test #04', () => {
+    expect(getIndexsForPalindrome('abac')).toEqual(null)
+  })
+
+  // Test: getIndexsForPalindrome('aaaaaaaa')
+  test('Test #05', () => {
+    expect(getIndexsForPalindrome('aaaaaaaa')).toEqual([])
+  })
+
+  // Test: getIndexsForPalindrome('aaababa')
+  test('Test #06', () => {
+    expect(getIndexsForPalindrome('aaababa')).toEqual([1, 3])
+  })
+
+  // Test: getIndexsForPalindrome('caababa')
+  test('Test #07', () => {
+    expect(getIndexsForPalindrome('caababa')).toEqual(null)
+  })
+
+  // Test: getIndexsForPalindrome('rotavator')
+  test('Test #08', () => {
+    expect(getIndexsForPalindrome('rotavator')).toEqual([])
+  })
+
+  // Test: getIndexsForPalindrome('rotaratov')
+  test('Test #09', () => {
+    expect(getIndexsForPalindrome('rotaratov')).toEqual([4, 8])
+  })
+
+  // Test: getIndexsForPalindrome('saippuakivikauppias')
+  test('Test #10', () => {
+    expect(getIndexsForPalindrome('saippuakivikauppias')).toEqual([])
+  })
+})