tdd assignment

Author: RaihanSharif

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

@@ -1,5 +1,11 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let total = 0;
+  for (const char of stringOfCharacters) {
+    if (char === findCharacter) {
+      total += 1;
+    }
+  }
+  return total;
 }
 
 module.exports = countChar;

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

@@ -22,3 +22,21 @@ 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 count zero occurrences of a character", () => {
+  const str = "aaaaa";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+// Scenario: Non-consecutive occurrances
+// Given the input string `str`,
+// And a character `char` that appears in more than one block within `str`.
+// When the function is called with these inputs,
+// Then it should return the number of total occurrances.
+test("should count non-contiguous occurrences of a character", () => {
+  const str = "aaaaabba";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(6);
+});

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

@@ -1,5 +1,19 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  // 11 is a special case
+  if (num === 11) {
+    return "11th";
+  }
+  const lastDigit = num % 10;
+  switch (lastDigit) {
+    case 1:
+      return String(num) + "st";
+    case 2:
+      return String(num) + "nd";
+    case 3:
+      return String(num) + "rd";
+    default:
+      return String(num) + "th";
+  }
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,41 @@ 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
+// When the number ends with 2
+// Then the function should return a string by appending "nd" to the number.
+test("should append 'nd' for numbers ending with 2", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
+
+// Case 3: Numbers ending with 3
+// When the number ends with 3
+// Then the function should return a string by appending "rd" to the number.
+test("should append 'rd' for numbers ending with 3", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(223)).toEqual("223rd");
+});
+
+// Case 4: the general(ish) case
+// When numbers end with 0, 4, 5, 6, 7, 8, 9
+// 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, 9", () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(24)).toEqual("24th");
+  expect(getOrdinalNumber(25)).toEqual("25th");
+  expect(getOrdinalNumber(46)).toEqual("46th");
+  expect(getOrdinalNumber(57)).toEqual("57th");
+  expect(getOrdinalNumber(78)).toEqual("78th");
+  expect(getOrdinalNumber(89)).toEqual("89th");
+});
+
+// Case 5: The special case of 11
+// When the number is 11
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+});

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

@@ -1,5 +1,15 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("invalid input: negative number");
+  }
+
+  if (count === 0) {
+    return "";
+  }
+
+  if ((count) => 1) {
+    return str.repeat(count);
+  }
 }
 
 module.exports = repeatStr;

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

@@ -8,8 +8,7 @@ const repeatStr = require("./repeat-str");
 // 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.
-
-test("should repeat the string count times", () => {
+test("should repeat the string 3 times", () => {
   const str = "hello";
   const count = 3;
   const repeatedStr = repeatStr(str, count);
@@ -20,13 +19,30 @@ 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 not repeat string with a count of 1", () => {
+  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 empty string with a count of 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 error when count < 0", () => {
+  const str = "hello";
+  const count = -2;
+  expect(() => repeatStr(str, count)).toThrow();
+});