London | 26-ITP-Jan | Maryanne Mosonik | 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 char of stringOfCharacters){
+    if (char === findCharacter) {
+      count++;
+    }
+  }
+  return count;
+} 
 
 module.exports = countChar;

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

@@ -16,6 +16,47 @@ test("should count multiple occurrences of a character", () => {
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
+test ("should return 0 when the character does not exist in the string", () => {
+  const str = "exist";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+test("should return 0 when the input string is empty", () => {
+  const str = "";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+test("should return 0 when the input character is an empty string", () => {
+  const str = "test";
+  const char = "";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+test("should return 0 when both the input string and character are empty", () => {
+  const str = "";
+  const char = "";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+test("should be case sensitive when counting characters", () => {
+  const str = "AaAaA";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+test("should count non-alphabet characters", () => {
+  const str = "12345!";
+  const char = "1";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+// Scenario: Empty String
+// Given an empty input string `str`,
+// And any character `char` (e.g., 'a'),
+// When the function is called with these inputs,
+// Then it should return 0, indicating that no occurrences of `char` were found in the empty string.
 
 // Scenario: No Occurrences
 // Given the input string `str`,

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

@@ -1,5 +1,21 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  const str = String(num);
+
+  const lastTwo = num % 100;
+
+  if (lastTwo === 11 || lastTwo === 12 || lastTwo === 13) {
+    return str + "th";
+  }
+  const lastDigit = num % 10;
+  if (lastDigit === 1) {
+    return str + "st";
+  } else if (lastDigit === 2) {
+    return str + "nd";
+  } else if (lastDigit === 3) {
+    return str + "rd";
+  } else {
+    return str + "th";
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,24 @@ 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");
+});
+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");
+});
+test("should append 'th' for numbers not ending with 1, 2, or 3", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+});

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

@@ -1,5 +1,8 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("Count must be a non-negative integer");
+  }
+  return str.repeat(count);
 }
 
 module.exports = repeatStr;

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

@@ -20,13 +20,30 @@ test("should repeat the string count times", () => {
 // 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.
+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 = -1;
+  expect(() => repeatStr(str, count)).toThrow("Count must be a non-negative integer");
+});