London | 26-ITP-Jan | Miriam Jorna | Sprint 3 | Practice TDD

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

@@ -1,5 +1,11 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (const char of stringOfCharacters) {
+    if (char === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
 
-module.exports = countChar;
+module.exports = countChar;

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

@@ -22,3 +22,9 @@ test("should count multiple occurrences of a character", () => {
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 when a character does not occur in the string", () => {
+  const str = "aaaaa";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,25 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  if (num === 0) {
+    return "0";
+  }
+
+  const lastTwoDigits = num % 100;
+  const lastDigit = num % 10;
+
+  switch (true) {
+    case lastTwoDigits === 11:
+    case lastTwoDigits === 12:
+    case lastTwoDigits === 13:
+      return `${num}th`;
+    case lastDigit === 1:
+      return `${num}st`;
+    case lastDigit === 2:
+      return `${num}nd`;
+    case lastDigit === 3:
+      return `${num}rd`;
+    default:
+      return `${num}th`;
+  }
 }
 
-module.exports = getOrdinalNumber;
+module.exports = getOrdinalNumber;

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

@@ -18,3 +18,28 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+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");
+});
+
+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");
+});
+
+test("should not append any suffix for the number 0 and return 0", () => {
+  expect(getOrdinalNumber(0)).toEqual("0");
+});
+
+test("should append 'th' for numbers ending with 4-9 or 0, including those ending with 11-13", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th"); 
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(200)).toEqual("200th");
+});

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

@@ -1,5 +1,12 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("Negative counts are not valid");
+  }
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
 }
 
-module.exports = repeatStr;
+module.exports = repeatStr;

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

@@ -4,6 +4,30 @@ const repeatStr = require("./repeat-str");
 // When the repeatStr function is called with these inputs,
 // Then it should:
 
+// 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 empty string on count of 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// 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 empty string on count of 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // Case: handle multiple repetitions:
 // Given a target string `str` and a positive integer `count` greater than 1,
 // When the repeatStr function is called with these inputs,
@@ -21,12 +45,18 @@ 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.
 
-// 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 the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
 
 // 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 on negative count", () => {
+  expect(() => repeatStr("hello", -1)).toThrow();
+});