West Midlands | ITP-SEPT-25 | Georgina Rogers | 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 (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,10 @@ test("should count multiple occurrences of a character", () => {
 // And a character char that does not exist within the case-sensitive str,
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of the char were found in the case-sensitive str.
+
+test("should return 0 when character does not exist in string", () => {
+  const str = "hello world";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,20 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const n = Math.abs(parseInt(num, 10));
+  const lastTwoDigits = n % 100;
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return `${n}th`;
+  }
+  const lastDigit = n % 10;
+  switch (lastDigit) {
+    case 1:
+      return `${n}st`;
+    case 2:
+      return `${n}nd`;
+    case 3:
+      return `${n}rd`;
+    default:
+      return `${n}th`;
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -4,10 +4,35 @@ const getOrdinalNumber = require("./get-ordinal-number");
 // continue testing and implementing getOrdinalNumber for additional cases
 // Write your tests using Jest - remember to run your tests often for continual feedback
 
-// Case 1: Identify the ordinal number for 1
-// When the number is 1,
-// Then the function should return "1st"
+// Case 1: Numbers ending in 1 except 11 -> "st"
+test("should return correct suffix for numbers ending in 1 except 11", () => {
+  const stNumbers = [1, 21, 101, 121];
+  for (const num of stNumbers) {
+    expect(getOrdinalNumber(num)).toEqual(`${num}st`);
+  }
+});
+
+// Case 2: Numbers ending in 2 except 12 -> "nd"
+test("should return correct suffix for numbers ending in 2 except 12", () => {
+  const ndNumbers = [2, 22, 102, 122];
+  for (const num of ndNumbers) {
+    expect(getOrdinalNumber(num)).toEqual(`${num}nd`);
+  }
+});
 
-test("should return '1st' for 1", () => {
-  expect(getOrdinalNumber(1)).toEqual("1st");
+// Case 3: Numbers ending in 3 except 13 -> "rd"
+test("should return correct suffix for numbers ending in 3 except 13", () => {
+  const rdNumbers = [3, 23, 103, 123];
+  for (const num of rdNumbers) {
+  expect(getOrdinalNumber(num)).toEqual(`${num}rd`);
+  }
 });
+
+// Case 4: Numbers ending in 4-9, 0, and 11-13 -> "th"
+test("should return correct suffix for numbers ending in 4-9, 0, and 11-13", () => {
+  const thNumbers = [4, 5, 6, 7, 8, 9, 11, 12, 13, 100];
+  for (const num of thNumbers) {
+  expect(getOrdinalNumber(num)).toEqual(`${num}th`);
+  }
+});
+

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

@@ -1,5 +1,8 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (!Number.isInteger(count) || count < 0) {
+    throw Error("Invalid count value");
+  }
+  return str.repeat(count);
 }
 
-module.exports = repeatStr;
+module.exports = repeat;

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

@@ -4,29 +4,53 @@ const repeatStr = require("./repeat-str");
 // When the repeatStr function is called with these inputs,
 // Then it should:
 
-// case: repeat String:
+// case 1: repeat String:
 // Given a target string str and a positive integer count,
 // When the repeatStr function is called with these inputs,
 // Then it should repeat the str count times and return a new string containing the repeated str values.
 
 test("should repeat the string count times", () => {
   const str = "hello";
   const count = 3;
-  const repeatedStr = repeatStr(str, count);
-  expect(repeatedStr).toEqual("hellohellohello");
+  expect(repeatStr(str, count)).toEqual("hellohellohello");
 });
 
-// case: handle Count of 1:
+// case 2: handle Count of 1:
 // Given a target string str and a count equal to 1,
 // When the repeatStr function is called with these inputs,
 // Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
+test("should return the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  expect(repeatStr(str, count)).toEqual("hello");
+});
 
-// case: Handle Count of 0:
+// case 3: 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, ensuring that a count of 0 results in an empty output.
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  expect(repeatStr(str, count)).toEqual("");
+});
 
-// case: Negative Count:
+// case 4: 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 or return an appropriate error message, as negative counts are not valid.
+test("should throw an error for negative count", () => {
+  const str = "hello";
+  const count = -2;
+  expect(() => repeatStr(str, count)).toThrow("Invalid count value");
+});
+
+// case 5: Non-integer Count:
+// Given a target string str and a non-integer count (e.g., a float or a string),
+// When the repeatStr function is called with these inputs,
+// Then it should throw an error or return an appropriate error message, as non-integer counts are not valid.
+test("should throw an error for non-integer count", () => {
+  const str = "hello";
+  const count = 2.5;
+  expect(() => repeatStr(str, count)).toThrow("Invalid count value");
+});