Palindromes

Author: Tittoh

README.md

@@ -11,3 +11,4 @@ Once inside, run the command below:
 2. Vowels counter
 3. Most recurring character
 4. Sentence Capitalization
+5. Palindromes

src/palindromes/index.js

@@ -0,0 +1,14 @@
+// pick a solution and insert here to run the test.
+
+
+function palindromeChecker(text) {
+    var textLen = text.length;
+    for (var i = 0; i < textLen / 2; i++) {
+        if (text[i] !== text[textLen - 1 - i]) {
+            return false;
+        }
+    }
+    return true;
+}
+
+module.exports = palindromeChecker;

src/palindromes/solutions.js

@@ -0,0 +1,36 @@
+// AN INTUITIVE APPROACH
+
+function palindromeChecker(text) {
+
+    var reversedText = text.toLowerCase()
+        .split('').reverse().join('')
+
+    return text === reversedText
+}
+
+
+// LOOPING THROUGH AND COMPARING CHARACTERS
+
+
+function palindromeChecker(text) {
+    let charArray = text.toLowerCase().split('')
+
+    let result = charArray.every((letter, index) => {
+        return letter === charArray[charArray.length - index - 1];
+    })
+
+    return result
+}
+
+// LOOPING THROUGH AND COMPARING CHARACTERS(OPTIMIZED)
+
+
+function palindromeChecker(text) {
+    var textLen = text.length;
+    for (var i = 0; i < textLen / 2; i++) {
+        if (text[i] !== text[textLen - 1 - i]) {
+            return false;
+        }
+    }
+    return true;
+}

src/palindromes/test.js

@@ -0,0 +1,22 @@
+const palindromeChecker = require('./index');
+
+test('palindromeChecker is a function', () => {
+  expect(typeof palindromeChecker).toEqual('function');
+});
+
+test('"php" is a palindrome', () => {
+  expect(palindromeChecker('php')).toBeTruthy();
+});
+
+test('" php  " is not a palindrome', () => {
+  expect(palindromeChecker(' php  ')).toBeFalsy();
+});
+
+test('"developer" is not a palindrome', () => {
+  expect(palindromeChecker('developer')).toBeFalsy();
+});
+
+test('"2002" a palindrome', () => {
+  expect(palindromeChecker('2002')).toBeTruthy();
+});
+