Hamming Distance

Author: Tittoh

README.md

@@ -12,3 +12,5 @@ Once inside, run the command below:
 3. Most recurring character
 4. Sentence Capitalization
 5. Palindromes
+6. Hamming Distance
+

src/hammingDistance/index.js

@@ -0,0 +1,20 @@
+// pick a solution and insert here to run the test.
+
+
+function hammingDistance(stringA, stringB) {
+    let result = 0
+
+    if (stringA.length == stringB.length) {
+
+        for (let i = 0; i < stringA.length; i++) {
+            if (stringA[i].toLowerCase() != stringB[i].toLowerCase()) {
+                result++
+            }
+        }
+        return result
+    } else {
+        throw new Error('Strings do not have equal length')
+    }
+}
+
+module.exports = hammingDistance

src/hammingDistance/solutions.js

@@ -0,0 +1,16 @@
+// USING FOR LOOP
+function hammingDistance(stringA, stringB) {
+    let result = 0
+
+    if (stringA.length == stringB.length) {
+
+        for (let i = 0; i < stringA.length; i++) {
+            if (stringA[i].toLowerCase() != stringB[i].toLowerCase()) {
+                result++
+            }
+        }
+        return result
+    } else {
+        throw new Error('Strings do not have equal length')
+    }
+}

src/hammingDistance/test.js

@@ -0,0 +1,23 @@
+const hammingDistance = require('./index')
+
+test('hammingDistance is a function', () => {
+  expect(typeof hammingDistance).toEqual('function')
+})
+
+test('returns the hamming distance for letters', () => {
+  expect(hammingDistance('river', 'rover')).toEqual(1)
+})
+
+test('returns the hamming distance for numbers', () => {
+  expect(hammingDistance('1011101', '1001001')).toEqual(2)
+})
+
+test('returns the hamming distance for letters', () => {
+  expect(hammingDistance('karolin', 'kerstin')).toEqual(3)
+})
+
+test('returns the hamming distance for letters', () => {
+  expect(hammingDistance('drummer', 'dresser')).toEqual(3)
+})
+
+