WIP: Cannot get coverage quite there

src/ageCalculator.js

@@ -0,0 +1,65 @@
+export default ageCalculator
+
+/**
+* Original Source: https://stackoverflow.com/a/7091965
+*
+* This method will calculate your today's age from
+* your date of birth
+*
+* @param {String} dateString - The birthdate String in the form (dd/mm/yyyy)
+* @return {String} - today's age String
+*/
+
+//is valid date format
+function ageCalculator (dateString) {
+	if (!isDate(dateString))
+		return "Not a valid date";
+	var birthDate = parseDate(dateString);
+	var today = new Date();
+  var age = today.getFullYear() - birthDate.getFullYear();
+  var age_months =  today.getMonth() - birthDate.getMonth();
+  var age_days = today.getDate() - birthDate.getDate();
+  if (age_months < 0 || (age_months == 0 && age_days < 0)) {
+      age = parseInt(age) - 1;
+  }
+  return age;
+}
+
+
+//convert the date string in the format of dd/mm/yyyy into a JS date object
+function parseDate(dateString) {
+  var dateParts = dateString.split("/");
+  return new Date(dateParts[2], (dateParts[1] - 1), dateParts[0]);
+}
+
+function isDate(txtDate) {
+  var currVal = txtDate;
+  if (currVal == '')
+    return true;
+
+  //Declare Regex
+  var rxDatePattern = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
+  var dtArray = currVal.match(rxDatePattern); // is format OK?
+
+  if (dtArray == null)
+    return false;
+
+  //Checks for dd/mm/yyyy format.
+  var dtDay = dtArray[1];
+  var dtMonth = dtArray[3];
+  var dtYear = dtArray[5];
+
+  if (dtMonth < 1 || dtMonth > 12)
+    return false;
+  else if (dtDay < 1 || dtDay > 31)
+    return false;
+  else if ((dtMonth == 4 || dtMonth == 6 || dtMonth == 9 || dtMonth == 11) && dtDay == 31)
+    return false;
+  else if (dtMonth == 2) {
+    var isleap = (dtYear % 4 == 0 && (dtYear % 100 != 0 || dtYear % 400 == 0));
+    if (dtDay > 29 || (dtDay == 29 && !isleap))
+      return false;
+  }
+
+  return true;
+}

src/array-average.js

@@ -12,4 +12,4 @@ function average(array) {
     return total + current
   })
   return sum / array.length
-}
+}

src/index.js

@@ -55,6 +55,7 @@ import timeDifference from './timeDifference'
 import isPrime from './is-prime'
 import swapElements from './swapElements'
 import reverse from './reverse'
+import ageCalculator from './ageCalculator'
 
 export {
   isOdd,
@@ -114,4 +115,5 @@ export {
   isPrime,
   swapElements,
   reverse,
+  ageCalculator
 }

test/ageCalculator.test.js

@@ -0,0 +1,23 @@
+import test from 'ava'
+import {ageCalculator} from '../src'
+
+test('Check for correct results', t => {
+	const dateString = "08/04/1997"
+	const expected_age = 20
+	const actual_age = age_calculator(dateString)
+	t.deepEqual(expected_age,actual_age)
+})
+
+test('Invalid date to check validation', t => {
+	const dateString = "08/15/1997"
+	const expected_age = 20
+	const actual_age = age_calculator(dateString)
+	t.deepEqual(expected_age,actual_age)
+})
+
+test('Invalid date to check validation pattern', t => {
+	const dateString = "08/1/199"
+	const expected_age = 20
+	const actual_age = age_calculator(dateString)
+	t.deepEqual(expected_age,actual_age)
+})