London | 26- ITP-May | Edina Kurdi | Sprint 3 | Practice TDD

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

@@ -1,5 +1,16 @@
-function countChar(stringOfCharacters, findCharacter) {
-  return 5
+function countChar(str, char) {
+  const arrayOfChars = Array.from(str);
+  let count = 0;
+  for (letter of arrayOfChars) {
+    if (char === letter) {
+      count++;
+    }
+  }
+  return count;
 }
 
 module.exports = countChar;
+countChar("absge", "a");
+
+//check if the code looks correct
+console.log(countChar("shdhhshd", "h"));

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

@@ -22,3 +22,10 @@ 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 if the character is not found in the string", () => {
+  const str = "aaaaa";
+  const char = "b";
+  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 output;
+  if (num % 100 === 11 || num % 100 === 12 || num % 100 === 13) {
+    output = `${num}th`;
+  } else if (num % 10 === 1) {
+    output = `${num}st`;
+  } else if (num % 10 === 2) {
+    output = `${num}nd`;
+  } else if (num % 10 === 3) {
+    output = `${num}rd`;
+  } else {
+    output = `${num}th`;
+  }
+  return output;
 }
 
 module.exports = getOrdinalNumber;
+
+//check if code runs
+console.log(getOrdinalNumber(1));

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 (but not 12)
+// When the number ends with 2, except those ending with 12,
+// Then the function should return a string by appending "nd" to the number.
+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)
+// When the number ends with 3, except those ending with 13,
+// Then the function should return a string by appending "rd" to the number.
+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, 13
+// When the number ends with 11, 12, or 13
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for numbers ending with 11, 12, or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(312)).toEqual("312th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(213)).toEqual("213th");
+});
+
+// Case 5: any other number ending
+// Then the function should return a string by appending "th" to the number.
+test("should append 'th' for numbers not ending with 1, 2, or 3", () => {
+  expect(getOrdinalNumber(0)).toEqual("0th");
+  expect(getOrdinalNumber(19)).toEqual("19th");
+  expect(getOrdinalNumber(137)).toEqual("137th");
+});

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

@@ -1,7 +1,44 @@
-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";
+
+  //handle negative count
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+
+  //with valid count input
+  let output = "";
+
+  for (let i = 0; i < count; i++) {
+    output = output + str;
+  }
+
+  return output;
 }
 
 module.exports = repeatStr;
+
+// 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 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 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 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.

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

@@ -21,12 +21,32 @@ 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", () => {
+  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 an empty string", () => {
+  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 an error when count is negative", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => repeatStr(str, count)).toThrow("Count cannot be negative");
+});