added "palindrome" folder

Author: westtle

palindrome/LICENSE.md

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+MIT License
+
+Copyright (c) 2023 westtle
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

palindrome/index.js

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+const prompt = require("prompt-sync")({sigint: true}); // prompt-sync (4.2.0) - https://www.npmjs.com/package/prompt-sync/v/4.2.0
+
+let userString = getUserInput("Input a word or a sentence to check").trim();
+
+function getUserInput(question) {
+    do {
+        var input = prompt(`${question}: `);
+    } while (!input.trim().length); // While length is 0 (false), but got reversed to 1 (true) because the negation.
+
+    return input;
+};
+
+function palindrome(string) {
+    let stringFiltered = string.toLowerCase().replace(/[^A-Za-z0-9]/g, ""); // Remove all non-alphanumerics characters.
+    let reverseStringFiltered = stringFiltered.split("").reverse().join("");
+
+    console.log(`\n${string} > ${stringFiltered}`);
+    console.log(stringFiltered === reverseStringFiltered ? `"${string}" is a palindrome.` : `"${string}" is NOT a palindrome.`);
+};
+
+palindrome(userString);
+
+// Some tests.
+palindrome("Hello World!");
+palindrome("A man, a plan, a canal. Panama");
+palindrome("No lemons, no melon");
+palindrome("Never odd or even");
+palindrome("almostomla");

palindrome/package-lock.json

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+{
+  "name": "palindrome",
+  "description": "Check to see if a word or a sencence is a palindrome!",
+  "author": "westtle",
+  "version": "1.0.0",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/westtle/code-dump.git"
+  },
+  "keywords": [
+    "javascript",
+    "node",
+    "palindrome"
+  ],
+  "license": "MIT",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "dependencies": {
+    "prompt-sync": "^4.2.0"
+  },
+  "bugs": {
+    "url": "https://github.com/westtle/code-dump/issues"
+  }
+}