Sheffield | 26-ITP-jan | Richard Frimpong | Sprint 3 | Structuring and Testing Data Stretch Coursework

Sprint-3/2-practice-tdd/get-ordinal-number.js

@@ -1,5 +1,26 @@
-function getOrdinalNumber(num) {
-  return "1st";
+function getOrdinalNumber(number) {
+  const lastTwoDigits = number % 100;
+
+  // Special cases: 11, 12, 13 always use "th"
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${number}th`;
+  }
+
+  const lastDigit = number % 10;
+
+  if (lastDigit === 1) {
+    return `${number}st`;
+  }
+
+  if (lastDigit === 2) {
+    return `${number}nd`;
+  }
+
+  if (lastDigit === 3) {
+    return `${number}rd`;
+  }
+
+  return `${number}th`;
 }
 
-module.exports = getOrdinalNumber;
+module.exports = getOrdinalNumber;

Sprint-3/2-practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,41 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+// Case 2: Numbers ending with 2 (but not 12)
+// When the number ends with 2, except those ending with 12,
+// Then the function should return a string by appending "nd" to the number.
+test("should append 'nd' for numbers ending with 2, except those ending with 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
+
+// Case 3: Numbers ending with 3 (but not 13)
+// When the number ends with 3, except those ending with 13,
+// Then the function should return a string by appending "rd" to the number.
+test("should append 'rd' for numbers ending with 3, except those ending with 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+
+// Case 4: Numbers ending with 11, 12, 13 (special cases)
+// These numbers should always end with "th".
+test("should append 'th' for numbers ending with 11, 12, or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+// Case 5: All other numbers
+// Numbers that do not end with 1, 2, or 3 should end with "th".
+test("should append 'th' for all other numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(24)).toEqual("24th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});

Sprint-3/4-stretch/card-validator.js

@@ -0,0 +1,24 @@
+function validateCreditCard(number) {
+  // Ensure number is 16 digits and only contains digits
+  if (number.length !== 16 || !/^\d+$/.test(number)) return false;
+
+  // Ensure at least 2 different digits are present
+  const uniqueDigits = new Set(number);
+  if (uniqueDigits.size < 2) return false;
+
+  // Ensure the last digit is even
+  const lastDigit = parseInt(number[number.length - 1], 10);
+  if (lastDigit % 2 !== 0) return false;
+
+  // Ensure the sum of digits is greater than 16
+  const sum = number.split('').reduce((acc, digit) => acc + parseInt(digit, 10), 0);
+  if (sum <= 16) return false;
+
+  // If all checks pass, the number is valid
+  return true;
+}
+// Function to validate a credit card number according to the rules in card-validator.md
+
+console.log(validateCreditCard('9999777788880000')); // true
+console.log(validateCreditCard('4444444444444444')); // false
+console.log(validateCreditCard('6666666666666661')); // false