@@ -0,0 +1,41 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+.DS_Store
+**/*/.DS_Store
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+
+# Yarn Integrity file
+.yarn-integrity
+
+# vscode
+.vscode/
@@ -0,0 +1,21 @@
+{
+  "name": "javascriptalgorithms",
+  "version": "0.0.0",
+  "description": "All algorithms implemented in JavaScript (for education) There implementations are for learning purposes. If you want to contribute more efficient solutions feel free to open an issue and commit your solution.",
+  "scripts": {
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/vJechsmayr/JavaScriptAlgorithms.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/vJechsmayr/JavaScriptAlgorithms/issues"
+  },
+  "homepage": "https://github.com/vJechsmayr/JavaScriptAlgorithms#readme",
+  "devDependencies": {
+    "jest": "^24.9.0"
+  }
+}
@@ -0,0 +1,27 @@
+function isPalindromeRecursive(chars, s, e) {
+  if (s === e) {
+    return true;
+  }
+  
+  if (chars[s] !== chars[e]) {
+    return false;
+  }
+
+  if (s < e + 1) {
+    return isPalindromeRecursive(chars, s + 1, e - 1)
+  }
+
+  return true;
+}
+
+function isPalindrome(s) {
+  // convert the input to string
+  const chars = String(s);
+  const len = chars.length
+  if (len <= 1) {
+    return true
+  }
+  return isPalindromeRecursive(chars, 0, len - 1);
+}
+
+module.exports = isPalindrome;
@@ -0,0 +1,22 @@
+const isPalindrome = require('./palindrome');
+
+describe('isPalindrome()', () => {
+  it('should return true for single number', () => {
+    expect(isPalindrome(1)).toBeTruthy();
+  })
+
+  it('should return true for valid number "121"', () => {
+    expect(isPalindrome(121)).toBeTruthy();
+  })
+
+  it('should return true for same number 111', () => {
+    expect(isPalindrome(111)).toBeTruthy();
+  })
+  it('should return false for invalid number', () => {
+    expect(isPalindrome(123)).toBeFalsy();
+  })
+
+  it('should return true for long value', () => {
+    expect(isPalindrome(123321123321)).toBeTruthy();
+  })
+})