London | 25-ITP-Sep | Shaghayegh Shirinfar | 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

@@ -17,8 +17,50 @@ test("should count multiple occurrences of a character", () => {
   expect(count).toEqual(5);
 });
 
+test("should count multiple occurrences of a character", () => {
+  const str = "bbb";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(3);
+});
+
+test("should count mutiple of character 'coco can have coconut'", () => {
+  const str = "coco can have coconut";
+  const char = "c";
+  const count = countChar(str, char);
+  expect(count).toEqual(5);
+});
+
+test("should count multiple occurrences of a character 'a' in 'I have an apple'", () => {
+  const str = "I have an apple";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(3);
+});
+
 // Scenario: No Occurrences
 // Given the input string str,
 // And a character char that does not exist within the case-sensitive str,
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of the char were found in the case-sensitive str.
+
+test("should return 0 when the character does not exist in the string", () => {
+  const str = "hello";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should return 0 when the character does not exist in the string", () => {
+  const str = "hello";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should return 0 when the 'c' does not exist in string 'I dont have an apple'", () => {
+  const str = "I dont have an apple";
+  const char = "c";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,14 @@
-function getOrdinalNumber(num) {
-  return "1st";
+function getOrdinalNumber(number) {
+  if (number % 100 >= 11 && number % 100 <= 13) {
+    return number + "th";
+  } else {
+    const lastdigit = number.toString().slice(-1);
+
+    if (lastdigit == 1) return number + "st";
+    if (lastdigit == 2) return number + "nd";
+    if (lastdigit == 3) return number + "rd";
+    return number + "th";
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -1,3 +1,4 @@
+// get-ordinal-number.test.js
 const getOrdinalNumber = require("./get-ordinal-number");
 // In this week's prep, we started implementing getOrdinalNumber
 
@@ -7,7 +8,62 @@ const getOrdinalNumber = require("./get-ordinal-number");
 // Case 1: Identify the ordinal number for 1
 // When the number is 1,
 // Then the function should return "1st"
-
 test("should return '1st' for 1", () => {
   expect(getOrdinalNumber(1)).toEqual("1st");
 });
+
+// Case 2: Identify the ordinal number for 2
+// When the number is 2,
+// Then the function should return "2nd"
+test("should return '2nd' for 2", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+});
+
+// Case 3: Identify the ordinal number for 3
+// When the number is 3,
+// Then the function should return "3rd"
+test("should return '3rd' for 3", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+});
+
+// Case 4: Identify the ordinal number for 4
+// When the number is 4,
+// Then the function should return "4th"
+test("should return '4th' for 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+});
+
+// Case 9: Identify the ordinal number for 9
+// When the number is 9,
+// Then the function should return "4th"
+test("should return '9th' for 9", () => {
+  expect(getOrdinalNumber(9)).toEqual("9th");
+});
+
+// Case 10: Identify the ordinal number for 10
+// When the number is 10,
+// Then the function should return "4th"
+test("should return '10th' for 10", () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+});
+
+// Case 11: Identify the ordinal number for 11
+// When the number is 11,
+// Then the function should return "4th"
+test("should return '11th' for 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+});
+
+// Case 20: Identify the ordinal number for 20
+// When the number is 20,
+// Then the function should return "20rd"
+test("should return '20th' for 20", () => {
+  expect(getOrdinalNumber(20)).toEqual("20th");
+});
+
+// Case 23: Identify the ordinal number for 23
+// When the number is 23,
+// Then the function should return "33rd"
+test("should return '23rd' for 23", () => {
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+});

Sprint-3/2-practice-tdd/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "2-practice-tdd",
+  "version": "1.0.0",
+  "description": "In this section you'll practice this key skill of building up your program test first.",
+  "main": "count.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs"
+}

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

@@ -1,5 +1,30 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (str === undefined) {
+    throw new Error("String must be defined");
+  }
+  if (str === null || typeof str !== "string") {
+    throw new Error("String must be a valid string");
+  }
+
+  if (count === undefined || typeof count !== "number") {
+    throw new Error("Count must be a number");
+  }
+
+  if (count < 0 || !Number.isInteger(count)) {
+    throw new Error("Count must be a non-negative integer");
+  }
+
+  if (str === "" || count === 0) {
+    return "";
+  }
+
+  // 5. Repeat the string count times
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+
+  return result;
 }
 
 module.exports = repeat;

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

@@ -1,4 +1,3 @@
-// Implement a function repeat
 const repeat = require("./repeat");
 // Given a target string str and a positive integer count,
 // When the repeat function is called with these inputs,
@@ -21,12 +20,69 @@ test("should repeat the string count times", () => {
 // When the repeat function is called with these inputs,
 // Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
 
+test("should return the original string when count is 1", () => {
+  const str = "hi";
+  const count = 1;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("hi");
+});
+
 // case: Handle Count of 0:
 // Given a target string str and a count equal to 0,
 // When the repeat function is called with these inputs,
 // Then it should return an empty string, ensuring that a count of 0 results in an empty output.
 
+test("should return an empty string when count is 0", () => {
+  const str = "hi";
+  const count = 0;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // case: Negative Count:
 // Given a target string str and a negative integer count,
 // When the repeat function is called with these inputs,
 // Then it should throw an error or return an appropriate error message, as negative counts are not valid.
+
+test("should throw an error when count is negative", () => {
+  const str = "hi";
+  const count = -2;
+  expect(() => repeat(str, count)).toThrow(
+    "Count must be a non-negative integer"
+  );
+});
+
+// case: Undefined String
+// Given that str is undefined and count is a positive integer,
+// When the repeat function is called with these inputs,
+// Then it should throw an error or return an appropriate message,
+// since repeating an undefined value does not make sense.
+
+test("should throw an error when string is undefined", () => {
+  const str = undefined;
+  const count = 2;
+  expect(() => repeat(str, count)).toThrow("String must be defined");
+});
+
+// case: Empty String
+// Given an empty string str and a positive integer count,
+// When the repeat function is called,
+// Then it should return an empty string, since there is nothing to repeat.
+
+test("should return an empty string when input string is empty", () => {
+  const str = "";
+  const count = 3;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// case: Null String
+// Given that str is null and count is a positive integer,
+// When the repeat function is called,
+// Then it should throw an error, because null is not a valid string input.
+
+test("should throw an error when string is null", () => {
+  const str = null;
+  const count = 2;
+  expect(() => repeat(str, count)).toThrow("String must be a valid string");
+});