London | 26-ITP-Sep | Shirin Panahian | Sprint 2 | Practice TDD

practice-tdd/count.js

@@ -1,3 +1,13 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  let position = stringOfCharacters.indexOf(findCharacter);
+  if (position === -1) {
+    return 0;
+  } else {
+    while (position !== -1) {
+      count++;
+      position = stringOfCharacters.indexOf(findCharacter, position + 1);
+    }
+    return count;
+  }
 }

practice-tdd/count.test.js

@@ -10,13 +10,48 @@ import { countChar } from "./count.js";
 // When the function is called with these inputs,
 // Then it should correctly count occurrences of `char`.
 
+test("should count multiple occurrences of a character", () => {
+  const str = "hello";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
 test("should count multiple occurrences of a character", () => {
   const str = "aaaaa";
   const char = "a";
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
 
+test("should count multiple occurrences of a character", () => {
+  const str = "Shirin";
+  const char = "h";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should count multiple occurrences of a character", () => {
+  const str = "This ia a second string test";
+  const char = "s";
+  const count = countChar(str, char);
+  expect(count).toEqual(4);
+});
+
+test("should count multiple occurrences of a character", () => {
+  const str = "";
+  const char = "t";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should count multiple occurrences of a character", () => {
+  const str = "TTTT";
+  const char = "t";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
 // Scenario: No Occurrences
 // Given the input string `str`,
 // And a character `char` that does not exist within `str`.

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,25 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  if (num % 100 === 11) {
+    throw new Error("Input must not ending with 11");
+  }
+  if (num % 10 === 1) {
+    return `${num}st`;
+  }
+
+  if (num % 100 === 22) {
+    throw new Error("Input must not ending with 22");
+  }
+
+  if (num % 10 === 2) {
+    return `${num}nd`;
+  }
+  if (num % 100 === 33) {
+    throw new Error("Input must not ending with 33");
+  }
+
+  if (num % 10 === 3) {
+    return `${num}rd`;
+  }
+
+  return `${num}th`;
 }

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

@@ -1,4 +1,5 @@
 import { getOrdinalNumber } from "./get-ordinal-number.js";
+import { test, expect } from "@jest/globals";
 // In this week's prep, we started implementing getOrdinalNumber.
 
 // Continue testing and implementing getOrdinalNumber for additional cases.
@@ -11,10 +12,59 @@ import { getOrdinalNumber } from "./get-ordinal-number.js";
 // This approach improves coverage and makes our tests easier to maintain.
 
 // Case 1: Numbers ending with 1 (but not 11)
+test("should not append 'st' for number ending with 11 ", () => {
+  expect(() => getOrdinalNumber(11)).toThrow("Input must not ending with 11");
+  expect(() => getOrdinalNumber(111)).toThrow("Input must not ending with 11");
+  expect(() => getOrdinalNumber(45711)).toThrow(
+    "Input must not ending with 11"
+  );
+});
+
 // When the number ends with 1, except those ending with 11,
 // 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(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
+  expect(getOrdinalNumber(241)).toEqual("241st");
+});
+
+// Case 2: Numbers ending with 2 (but not 22)
+// When the number ends with 2, except those ending with 22,
+// 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 22", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(32)).toEqual("32nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
+
+test("should not append 'nd' for number ending with 22 ", () => {
+  expect(() => getOrdinalNumber(22)).toThrow("Input must not ending with 22");
+  expect(() => getOrdinalNumber(122)).toThrow("Input must not ending with 22");
+  expect(() => getOrdinalNumber(45722)).toThrow(
+    "Input must not ending with 22"
+  );
+});
+
+// Case 3: Numbers ending with 3 (but not 33)
+test("should append 'rd' for numbers ending with 3, except those ending with 33", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(13)).toEqual("13rd");
+  expect(getOrdinalNumber(123)).toEqual("123rd");
+});
+
+test("should not append 'rd' for number ending with 33 ", () => {
+  expect(() => getOrdinalNumber(33)).toThrow("Input must not ending with 33");
+  expect(() => getOrdinalNumber(133)).toThrow("Input must not ending with 33");
+  expect(() => getOrdinalNumber(45733)).toThrow(
+    "Input must not ending with 33"
+  );
+});
+
+// Case 3: Numbers ending in other digits
+test("should append 'th' for numbers ending in other digits", () => {
+  expect(getOrdinalNumber(4)).toBe("4th");
+  expect(getOrdinalNumber(5)).toBe("5th");
+  expect(getOrdinalNumber(10)).toBe("10th");
+  expect(getOrdinalNumber(20)).toBe("20th");
 });

practice-tdd/repeat-str.js

@@ -1,5 +1,12 @@
-export function repeatStr() {
+export 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 counts are not valid");
+  }
+  let strRep = "";
+  for (let i = 0; i < count; i++) {
+    strRep += str;
+  }
+  return strRep;
 }

practice-tdd/repeat-str.test.js

@@ -1,5 +1,6 @@
 // Implement a function repeatStr
 import { repeatStr } from "./repeat-str.js";
+import { test, expect } from "@jest/globals";
 // Given a target string `str` and a positive integer `count`,
 // When the repeatStr function is called with these inputs,
 // Then it should:
@@ -15,18 +16,39 @@ test("should repeat the string count times", () => {
   const repeatedStr = repeatStr(str, count);
   expect(repeatedStr).toEqual("hellohellohello");
 });
-
 // Case: 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.
-
+test("should repeat the string count times", () => {
+  const str = "World";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("World");
+});
 // 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 for zero", () => {
+  const str = "Hi!";
+  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, as negative counts are not valid", () => {
+  const str = "Hi!";
+  const count = -4;
+  expect(() => repeatStr(str, -4)).toThrow("negative counts are not valid");
+});
+
+test("should repeat the string count times", () => {
+  const str = "";
+  const count = 5;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});