London | 26-ITP-Sep | Hanna Bohlin | Sprint 2 | Practice TDD

practice-tdd/count.js

@@ -1,3 +1,11 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let numOfChar = 0;
+
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters.charAt(i) === findCharacter) {
+      numOfChar++;
+    }
+  }
+
+  return numOfChar;
 }

practice-tdd/count.test.js

@@ -17,8 +17,36 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
+test("should count multiple occurrences of a character, any string length", () => {
+  const str = "aaaaaa";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(6);
+});
+
+test("any string length, varying chars in string", () => {
+  const str = "aaabaaa";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(6);
+});
+
+test("any string length, varying chars in string, any char in string", () => {
+  const str = "aaabaaa";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
 // Scenario: No Occurrences
 // Given the input string `str`,
 // 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("any string length, varying chars in string, char NOT in string", () => {
+  const str = "aaabaaa";
+  const char = "c";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,33 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  if (
+    num <= 0 ||
+    num % 1 !== 0 ||
+    !num ||
+    typeof num !== "number" ||
+    num.length > 1
+  ) {
+    throw new Error("Error: positive whole number is needed");
+  }
+
+  if (
+    (num - 11) % 100 === 0 ||
+    (num - 12) % 100 === 0 ||
+    (num - 13) % 100 === 0
+  ) {
+    return num + "th";
+  }
+
+  if ((num - 1) % 10 === 0) {
+    return num + "st";
+  }
+
+  if ((num - 2) % 10 === 0) {
+    return num + "nd";
+  }
+
+  if ((num - 3) % 10 === 0) {
+    return num + "rd";
+  }
+
+  return num + "th";
 }

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

@@ -18,3 +18,74 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+
+// Case 2: Numbers ending with 11. Should append "th" to the number
+test("should append 'th' for numbers ending with 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(4211)).toEqual("4211th");
+});
+
+// Case 3: Numbers ending with 2 (but not 12). Should append "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(22)).toEqual("22nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
+
+// Case 4: Numbers ending with 12. Should append "th" to the number
+test("should append 'th' for numbers ending with 12", () => {
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(4212)).toEqual("4212th");
+});
+
+// Case 5: Numbers ending with 3 (but not 13). Should append "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(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+
+// Case 6: Numbers ending with 13. Should append "th" to the number
+test("should append 'th' for numbers ending with 13", () => {
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+  expect(getOrdinalNumber(4213)).toEqual("4213th");
+});
+
+// Case 7: All other positive whole numbers. Should append "th" to the number
+test("should append 'th' for all other positive whole numbers", () => {
+  expect(getOrdinalNumber(1834)).toEqual("1834th");
+  expect(getOrdinalNumber(23151509)).toEqual("23151509th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});
+
+// Case 8: Throw error for invalid-numbers
+test("should throw error for all invalid numbers", () => {
+  expect(() => {
+    getOrdinalNumber(5.7);
+  }).toThrow("Error: positive whole number is needed");
+  expect(() => {
+    getOrdinalNumber(-3859);
+  }).toThrow("Error: positive whole number is needed");
+  expect(() => {
+    getOrdinalNumber(0);
+  }).toThrow("Error: positive whole number is needed");
+});
+
+// Case 9: Throw error for non-numbers
+test("should throw error for all non-numbers", () => {
+  expect(() => {
+    getOrdinalNumber();
+  }).toThrow("Error: positive whole number is needed");
+  expect(() => {
+    getOrdinalNumber("hey");
+  }).toThrow("Error: positive whole number is needed");
+  expect(() => {
+    getOrdinalNumber(undefined);
+  }).toThrow("Error: positive whole number is needed");
+  expect(() => {
+    getOrdinalNumber(true);
+  }).toThrow("Error: positive whole number is needed");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,13 @@
-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("/Error: count should be non negative integer/");
+  }
+
+  let repeatedStr = "";
+
+  for (let i = 0; i < count; i++) {
+    repeatedStr += str;
+  }
+
+  return repeatedStr;
 }

practice-tdd/repeat-str.test.js

@@ -10,23 +10,56 @@ import { repeatStr } from "./repeat-str.js";
 // Then it should return a string that contains the original `str` repeated `count` times.
 
 test("should repeat the string count times", () => {
-  const str = "hello";
+  let str = "hello";
+  let count = 3;
+  let repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hellohellohello");
+  str = "hello";
+  count = 4;
+  repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hellohellohellohello");
+});
+
+test("should repeat the string count times, any string", () => {
+  const str = "Orb";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
-  expect(repeatedStr).toEqual("hellohellohello");
+  expect(repeatedStr).toEqual("OrbOrbOrb");
 });
 
 // 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 not repeat 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 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 error when count is negative", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => {
+    repeatStr(str, count);
+  }).toThrow("/Error: count should be non negative integer/");
+});