London | 26-ITP-Sep | Bartosz Kawiak | Sprint 2| Practice-TDD

practice-tdd/count.js

@@ -1,3 +1,9 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count += 1;
+    }
+  }
+  return count;
 }

practice-tdd/count.test.js

@@ -4,6 +4,21 @@ import { countChar } from "./count.js";
 // When the countChar function is called with these inputs,
 // Then it should:
 
+test("should return 0 for an empty string", () => {
+  expect(countChar("", "a")).toEqual(0);
+});
+test("should return 1 for a single matching character", () => {
+  expect(countChar("a", "a")).toEqual(1);
+});
+
+test("should return 0 for a single non-matching character", () => {
+  expect(countChar("b", "a")).toEqual(0);
+});
+
+test("should return 1 when character appears once", () => {
+  expect(countChar("abc", "b")).toEqual(1);
+});
+
 // Scenario: Multiple Occurrences
 // Given the input string `str`,
 // And a character `char` that occurs one or more times in `str` (e.g., 'a' in 'aaaaa'),
@@ -22,3 +37,8 @@ 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("A character that does not exist in the string should return 0.", () => {
+  const str = "aaaaa";
+  const char = "p";
+  expect(countChar(str, char)).toEqual(0);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,19 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  const exceptions = [11, 12, 13];
+  const strNum = num.toString();
+
+  for (let exception of exceptions) {
+    if (strNum.endsWith(exception.toString())) {
+      return strNum + "th";
+    }
+  }
+
+  if (strNum.endsWith("1")) {
+    return strNum + "st";
+  } else if (strNum.endsWith("2")) {
+    return strNum + "nd";
+  } else if (strNum.endsWith("3")) {
+    return strNum + "rd";
+  }
+  return strNum + "th";
 }

practice-tdd/get-ordinal-number.test.js

@@ -15,6 +15,37 @@ import { getOrdinalNumber } from "./get-ordinal-number.js";
 // Then the function should return a string by appending "st" to the number.
 test("should append 'st' for numbers ending with 1, except those ending with 11", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
   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(12)).toEqual("12th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  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(33)).toEqual("33rd");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+// Case 4: Numbers ending within the range of 4-9 (also  ending with 0)
+// When the number ends within the range of 4-9 or ends with 0.
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for numbers ending within 4-9, or ends with 0", () => {
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(37)).toEqual("37th");
+  expect(getOrdinalNumber(139)).toEqual("139th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,10 @@
-export function repeatStr() {
-  // 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";
+export function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
 }

practice-tdd/repeat-str.test.js

@@ -20,13 +20,28 @@ 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 original str value if called once", () => {
+  const str = "hello";
+  const count = 1;
+  expect(repeatStr(str, count)).toEqual(str);
+});
 
 // 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 if called with count =0", () => {
+  const str = "hello";
+  const count = 0;
+  expect(repeatStr(str, count)).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 error as negatives are not valid", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrow(Error);
+});