2-practice-tdd exercise

Author: lintsang

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

@@ -1,5 +1,11 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let countTime = 0;
+  for (let i = 0; i < stringOfCharacters.length; i++) {
+    if (stringOfCharacters.slice(i, i + 1) == findCharacter) {//take each character out from string to compare with the given character. If true, then add one to countTime.
+      countTime = countTime + 1;
+    }
+  }
+  return countTime;
 }
 
 module.exports = countChar;

Sprint-3/2-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", () => {
+  const str = "aaabcde";
+  const char = "c";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should count multiple occurrences of a character", () => {
+  const str = "a2b3c4";
+  const char = "3";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should count multiple occurrences of a character", () => {
+  const str = "4444444444444444444";
+  const char = "4";
+  const count = countChar(str, char);
+  expect(count).toEqual(19);
+});
+
 // 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("should count no occurrence of a character", () => {
+  const str = "fghij";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,43 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  let onesDigit;
+
+  if (String(num).length > 1) {
+    //check if the number has more than 1 digit
+    onesDigit = Number(String(num).slice(-1)); //extract the figure at the tens digit, and convert it into a number.
+    const tensDigit = Number(String(num).slice(-2, -1)); //extract the figure at the tens digit, and convert it into a number.
+
+    if (onesDigit == 1) {
+      if (tensDigit == 1) {
+        return num + "th";
+      } else {
+        return num + "st";
+      }
+    } else if (onesDigit == 2) {
+      if (tensDigit == 1) {
+        return num + "th";
+      }
+      return num + "nd";
+    } else if (onesDigit == 3) {
+      if (tensDigit == 1) {
+        return num + "th";
+      }
+      return num + "rd";
+    } else {
+      ("th");
+    }
+  } else if (String(num).length == 1) {
+    onesDigit = Number(String(num)[0]); //extract the figure at the tens digit, and convert it into a number.
+    if (onesDigit == 1) {
+      return num + "st";
+      console.log("Yeah youre in");
+    } else if (onesDigit == 2) {
+      return num + "nd";
+    } else if (onesDigit == 3) {
+      return num + "rd";
+    } else {
+      return num + "th";
+    }
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,25 @@ 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(132)).toEqual("132nd");
+});
+
+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");
+});
+
+test("should append 'th' for other numbers without ending with 1,2 or 3, except those ending with 1 in tens digit", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+  expect(getOrdinalNumber(213)).toEqual("213th");
+  expect(getOrdinalNumber(313)).toEqual("313th");
+  expect(getOrdinalNumber(1113)).toEqual("1113th");
+});

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

@@ -1,7 +1,17 @@
-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";
+  let strOutput = "";
+  if (count > 0){
+    for (let i=0 ; i<count ; i++){
+      strOutput = strOutput + str; 
+    }
+    return strOutput;
+  } else if (count == 0){
+    return "";
+  }else{
+    return "error";
+  }
 }
 
 module.exports = repeatStr;

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

@@ -20,13 +20,31 @@ 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 the string with no reptition", () => {
+  const str = "morning";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("morning");
+});
 
 // 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 as the count is zero", () => {
+  const str = "afternoon";
+  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 return the string with no reptition", () => {
+  const str = "evening";
+  const count = -1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("error");
+});