West-Midlands | 26-ITP-May | Maryam Janjua | Sprint 3 | Sprint 3 TDD Coursework

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

@@ -1,5 +1,12 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  const lengthOfStr =  stringOfCharacters.length;
+  let  numOfOccurrence = 0;
+  for(let i = 0; i< lengthOfStr ; i++){
+    if(stringOfCharacters[i] == findCharacter){
+      numOfOccurrence = numOfOccurrence +  1;
+    }
+  }
+  return numOfOccurrence;
 }
 
 module.exports = countChar;

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

@@ -16,9 +16,29 @@ test("should count multiple occurrences of a character", () => {
   const count = countChar(str, char);
   expect(count).toEqual(5);
 });
+// multiple occurrences of a particular character
+test("should count multiple occurrences of a character in a general string", () => {
+  const str = "banana";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(3);
+});
 
+//empty string given
+test("should return 0 when the string is empty", () => {
+  const str = "";
+  const char = "a";
+  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`.
 // 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 the character does not exist in the string", () => {
+  const str = "Hello world";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,20 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  let lastTwoDigit = num % 100;
+  let lastDigit = num % 10;
+  if(lastTwoDigit == "11" || lastTwoDigit == "12" || lastTwoDigit == "13"){
+    return num + "th"; 
+  }
+  else if(lastDigit =="1"){
+    return num + "st";
+  }
+  else if(lastDigit == "2"){
+    return num + "nd";
+  }
+  else if(lastDigit == "3"){
+    return num + "rd";
+  }
+  else{
+    return num + "th";
+  }
 }
-
 module.exports = getOrdinalNumber;

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

@@ -13,8 +13,38 @@ const getOrdinalNumber = require("./get-ordinal-number");
 // Case 1: Numbers ending with 1 (but not 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");
 });
+
+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(42)).toEqual("42nd");
+  expect(getOrdinalNumber(102)).toEqual("102nd");
+});
+
+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");
+});
+
+// Numbers ending with 11, 12, or 13 are exceptions and should use "th"
+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");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+});
+
+test("should append 'th' for numbers", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+});

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

@@ -1,7 +1,15 @@
-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";
+function repeatStr(str, count) {
+  if (count < 0){
+    throw new Error("invalid count");
+  }
+
+  let result="";
+
+  for(let i=1 ; i <= count ; i++){
+    result= str + result;
+  }
+
+  return result;
 }
 
 module.exports = repeatStr;

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

@@ -1,32 +1,63 @@
 // Implement a function repeatStr
 const repeatStr = require("./repeat-str");
-// Given a target string `str` and a positive integer `count`,
-// When the repeatStr function is called with these inputs,
-// Then it should:
-
-// Case: handle multiple repetitions:
-// Given a target string `str` and a positive integer `count` greater than 1,
-// When the repeatStr function is called with these inputs,
-// Then it should return a string that contains the original `str` repeated `count` times.
 
+// Case: handle multiple repetitions
 test("should repeat the string count times", () => {
   const str = "hello";
   const count = 3;
   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.
+// Case: handle count of 1
+test("should return the original string when count is 1", () => {
+  const str = "Maryam";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual(str);
+});
 
-// 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.
+// Case: handle count of 0
+test("should return an empty string when count is 0", () => {
+  const str = "Hello World!";
+  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.
+// Case: handle negative count
+test("should throw an error when count is negative", () => {
+  const str = "Hello World!";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrow();
+});
+// Case: empty string with count of 3
+test("should return an empty string when string is empty and count is 3", () => {
+  const str = "";
+  const count = 3;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// Case: empty string with count of 1
+test("should return an empty string when string is empty and count is 1", () => {
+  const str = "";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// Case: empty string with count of 0
+test("should return an empty string when string is empty and count is 0", () => {
+  const str = "";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// Case: empty string with negative count
+test("should throw an error when string is empty and count is negative", () => {
+  const str = "";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrow();
+});