Manchester | 26-ITP-May | Joanne O’Malley | Sprint 3 | Practice TDD

Sprint-3/2-practice-tdd/count.js

@@ -1,5 +1,5 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  return stringOfCharacters.split('').filter(x => x === findCharacter).length
 }
 
 module.exports = countChar;

Sprint-3/2-practice-tdd/count.test.js

@@ -17,6 +17,46 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
+// Scenario: No Occurrences
+test("should return 0 when character is not present", () => {
+  const str = "hello";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toBe(0);
+});
+
+// Scenario: Single Occurrence
+test("should count a single occurrence of a character", () => {
+  const str = "hello";
+  const char = "h";
+  const count = countChar(str, char);
+  expect(count).toBe(1);
+});
+
+// Scenario: Mixed string
+test("should count occurrences in a mixed string", () => {
+  const str = "banana";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toBe(3);
+});
+
+// Scenario: Empty string
+test("should return 0 for empty string", () => {
+  const str = "";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toBe(0);
+});
+
+// Scenario: Case sensitivity
+test("should be case sensitive", () => {
+  const str = "AaAa";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toBe(2);
+});
+
 // Scenario: No Occurrences
 // Given the input string `str`,
 // And a character `char` that does not exist within `str`.

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

@@ -1,5 +1,23 @@
 function getOrdinalNumber(num) {
-  return "1st";
+    const asString = String(num);
+
+    if (num === 0) {
+        return "0";
+    } else if (
+        asString.endsWith("11") ||
+        asString.endsWith("12") ||
+        asString.endsWith("13")
+    ) {
+        return asString + "th";
+    } else if (asString.endsWith("1")) {
+        return asString + "st";
+    } else if (asString.endsWith("2")) {
+        return asString + "nd";
+    } else if (asString.endsWith("3")) {
+        return asString + "rd";
+    } else {
+        return asString + "th";
+    }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,40 @@ 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)
+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(102)).toEqual("102nd");
+});
+
+// Case 3: Numbers ending with 3 (but not 13)
+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(103)).toEqual("103rd");
+});
+
+// Case 4: Numbers ending with 11, 12, or 13 should always use '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(212)).toEqual("212th");
+  expect(getOrdinalNumber(313)).toEqual("313th");
+});
+
+// Case 5: All other numbers should use 'th'
+test("should append 'th' for numbers that do not end in 1, 2, or 3", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(20)).toEqual("20th");
+  expect(getOrdinalNumber(99)).toEqual("99th");
+});
+
+// Case 6: Zero should return '0'
+test("should return '0' when the input is zero", () => {
+  expect(getOrdinalNumber(0)).toEqual("0");
+});

Sprint-3/2-practice-tdd/repeat-str.js

@@ -1,7 +1,12 @@
-function repeatStr() {
+function repeatStr(str, count) {
   // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
   // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+if (count < 0) {
+    throw new Error("Negative count is not allowed");
+
+  } else {
+    return Array.from({ length: count }, () => str).join("");
+  }
 }
 
 module.exports = repeatStr;

Sprint-3/2-practice-tdd/repeat-str.test.js

@@ -21,12 +21,35 @@ test("should repeat the string count times", () => {
 // When the repeatStr function is called with these inputs,
 // Then it should return the original `str` without repetition.
 
+test("should return the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+
 // Case: Handle count of 0:
 // Given a target string `str` and a `count` equal to 0,
 // When the repeatStr function is called with these inputs,
 // Then it should return an empty string.
 
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // Case: Handle negative count:
 // Given a target string `str` and a negative integer `count`,
 // When the repeatStr function is called with these inputs,
 // Then it should throw an error, as negative counts are not valid.
+
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -2;
+
+  expect(() => {
+    repeatStr(str, count);
+  }).toThrow();
+});