London| 26-ITP-May | Martin Mwaka | Sprint 3 | Practice tdd

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

@@ -1,5 +1,10 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  if (stringOfCharacters.length === 0 || findCharacter.length === 0) return 0;
+  let count = 0;
+  for (const char of stringOfCharacters) {
+    if (char === findCharacter) count++;
+  }
+  return count;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,40 @@ 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("should return 0 if no occurences of a character", () => {
+  const str = "fruit";
+  const char = "p";
+  const count = countChar(str, char);
+  expect(count).toBe(0);
+});
+
+// Scenario: Empty String
+test("should return 0 if the string is empty", () => {
+  const str = "";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toBe(0);
+});
+
+// Scenario: Empty character
+test("should return 0 if the character is empty", () => {
+  const str = "fruit";
+  const char = "";
+  const count = countChar(str, char);
+  expect(count).toBe(0);
+});
+
+// Scenario: Single character found
+test("should return 1 if single occurrence of a character", () => {
+  const str = "fruit";
+  const char = "r";
+  const count = countChar(str, char);
+  expect(count).toBe(1);
+});
+
+test("should be case sensitive", () => {
+  const str = "coMmand";
+  const char = "m";
+  const count = countChar(str, char);
+  expect(count).toBe(1);
+});

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

@@ -1,5 +1,17 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  let strNum;
+  const lastNum = num % 10;
+  const lastTwoNums = num % 100;
+  if (lastNum === 1 && lastTwoNums !== 11) {
+    strNum = `${String(num)}st`;
+  } else if (lastNum === 2 && lastTwoNums !== 12) {
+    strNum = `${String(num)}nd`;
+  } else if (lastNum === 3 && lastTwoNums !== 13) {
+    strNum = `${String(num)}rd`;
+  } else {
+    strNum = `${String(num)}th`;
+  }
+  return strNum;
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,27 @@ 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(182)).toEqual("182nd");
+});
+
+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(103)).toEqual("103rd");
+});
+
+test("should append 'th' for numbers ending 11, 12 or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});
+
+test("should append 'th' for numbers not ending with 1, 2 or 3", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(15)).toEqual("15th");
+  expect(getOrdinalNumber(199)).toEqual("199th");
+});

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

@@ -1,7 +1,12 @@
-function repeatStr() {
+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("Number must be 0 or greater");
+  }
+
+  return new Array(count).fill(str).join("");
 }
 
 module.exports = repeatStr;

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

@@ -21,12 +21,28 @@ test("should repeat the string count times", () => {
 // When the repeatStr function is called with these inputs,
 // Then it should return the original `str` without repetition.
 
+test("should return the original string if there is no repetition", () => {
+  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 a negative number", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrowError();
+});