London | 26-ITP-May | Ebrahim Moqbel | sprint 3 | practice tdd

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

@@ -1,5 +1,15 @@
+//counts the number of times a character occurs in a string
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (const char of stringOfCharacters) {
+    if (char === findCharacter) {
+      count += 1;
+    }
+  }
+
+
+  return count 
+
 }
 
 module.exports = countChar;

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

@@ -3,6 +3,11 @@ const countChar = require("./count");
 // Given a string `str` and a single character `char` to search for,
 // When the countChar function is called with these inputs,
 // Then it should:
+test("should count the number of times a character occurs in a string", () => {
+  expect(countChar('hello world', "o")).toEqual(2);
+  expect(countChar('hello world', "l")).toEqual(3);
+  expect(countChar('hello world', "z")).toEqual(0);
+});
 
 // Scenario: Multiple Occurrences
 // Given the input string `str`,
@@ -22,3 +27,10 @@ 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 the character does not accur in the string", () => {
+  const str = "hello world";
+  const char = "z";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});

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

@@ -1,5 +1,23 @@
 function getOrdinalNumber(num) {
-  return "1st";
+  let lastTwoDigits = num % 100;
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return num + "th";
+  }
+  let lastDigit = num % 10;
+
+  if (lastDigit === 1) {
+    return num + "st";
+  }
+
+  if (lastDigit === 2) {
+    return num + 'nd';
+  }
+
+  if (lastDigit === 3) {
+    return num + 'rd';
+  } 
+
+  return num + 'th';
 }
 
 module.exports = getOrdinalNumber;

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

@@ -18,3 +18,42 @@ 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)
+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");
+});
+
+// Case 3: Numbers ending with 3 (but not 13) 
+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");
+});
+
+// Case 4: Numbers ending with 11, 12 or 13
+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');
+})
+
+//Case 5: Numbers ending with 0, 4, 5, 6, 7, 8 or 9 
+test("should append 'th' for numbers ending with 0, 4, 5, 6, 7, 8, or 9", () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(6)).toEqual("6th");
+  expect(getOrdinalNumber(7)).toEqual("7th");
+  expect(getOrdinalNumber(8)).toEqual("8th");
+  expect(getOrdinalNumber(9)).toEqual("9th");
+  expect(getOrdinalNumber(100)).toEqual("100th");
+  expect(getOrdinalNumber(11)).toEqual('11th'); // special case
+  expect(getOrdinalNumber(12)).toEqual('12th'); // special case
+  expect(getOrdinalNumber(13)).toEqual('13th'); // special case
+});

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

@@ -1,7 +1,19 @@
-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("Count must be a non-negative integer");
+  }
+
+  if (count === 0) {
+    return "";
+  }
+
+  let repeatedStr = "";
+
+  for (let i = 0; i < count; i++) {
+    repeatedStr += str;
+  }
+
+  return repeatedStr;
 }
 
 module.exports = repeatStr;

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

@@ -21,12 +21,29 @@ 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 = "world";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("world");
+});
 // 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 = "test";
+  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 = "error";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrow("Count must be a non-negative integer");
+})