London | 26-ITP-Jan | Boualem Larbi Djebbour | 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 i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters[i] === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,9 @@ 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 when character is not found", () => {
+  const str = "codeyourfuture";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,18 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  let lastDigit = num % 10;
+  let lastTwoDigits = num % 100;
+  if (lastDigit === 1 && lastTwoDigits !== 11) {
+    // we also can use if (num.slice(-1)==="1" && num.slice(-2)!=="11")
+    return num + "st";
+  } else if (lastDigit === 2 && lastTwoDigits !== 12) {
+    // we also can use if (num.slice(-1)==="2" && num.slice(-2)!=="12")
+    return num + "nd";
+  } else if (lastDigit === 3 && lastTwoDigits !== 13) {
+    // we also can use if (num.slice(-1)==="3" && num.slice(-2)!=="13")
+    return num + "rd";
+  } else {
+    return num + "th";
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,47 @@ 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 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(202)).toEqual("202nd");
+  expect(getOrdinalNumber(1032)).toEqual("1032nd");
+});
+
+// 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(2333)).toEqual("2333rd");
+  expect(getOrdinalNumber(13453)).toEqual("13453rd");
+});
+
+// Case 4: numbers ending with 11, 12, or 13
+// When the number ends with 11, 12, or 13,
+// Then the function should return a string by appending "th" to the number.
+
+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");
+});
+
+// Case 5: numbers that ends with 0, 4, 5, 6, 7, 8, or 9
+// When the number ends with 0, 4, 5, 6, 7, 8, or 9
+// Then the function should return a string by appending "th" to the number.
+
+test("should append 'th' for numbers ending with 0, 4, 5, 6, 7, 8, or 9", () => {
+  expect(getOrdinalNumber(0)).toEqual("0th");
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(11)).toEqual("115th");
+  expect(getOrdinalNumber(12)).toEqual("126th");
+  expect(getOrdinalNumber(13)).toEqual("137th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+  expect(getOrdinalNumber(1012)).toEqual("1012th");
+  expect(getOrdinalNumber(1038)).toEqual("1038th");
+});

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

@@ -1,5 +1,17 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count >= 0) {
+    return str.repeat(count);
+  } else {
+    throw new Error("Count cannot be a negative number");
+  }
 }
+// I can make the 3 valid cases in 1 case with the repeat method as folows:
+// function repeatStr(str, count) {
+//   if (count >= 0) {
+//     return str.repeat(count);
+//   } else {
+//     throw new Error("Count cannot be a negative number");
+//   }
+// }
 
 module.exports = repeatStr;

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

@@ -21,12 +21,34 @@ 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 when count is 1", () => {
+  const str = "djebsoft";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("djebsoft");
+});
+
 // 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 = "djebsoft";
+  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 = "CYF";
+  const count = -2;
+  expect(() => repeatStr(str, count)).toThrow(
+    "Count cannot be a negative integer"
+  );
+});