Manchester | 26-ITP-Sep | Salah Alsabhi | Sprint 2 | practice tdd

practice-tdd/count.js

@@ -1,3 +1,13 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  const str = stringOfCharacters.toLowerCase();
+  const target = findCharacter.toLowerCase();
+
+  for (let ch of str) {
+    if (ch === target) {
+      count += 1;
+    }
+  }
+  return count;
 }
+

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 character occurrences case-insensitively", () => {
+  const str = "BanaNa";
+  const char = "n";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+
+test("should count 0 occurrences of a character", () => {
+  const str = "hello";
+  const char = "c";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+
+test("should return 0 when the string is empty", () => {
+  expect(countChar("", "a")).toEqual(0);
+});

practice-tdd/get-ordinal-number.js

@@ -1,3 +1,24 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  const lastTwoDigits = num % 100;
+  const lastDigit = num % 10;
+
+  if (lastTwoDigits === 11 || lastTwoDigits === 12 || lastTwoDigits === 13) {
+    return `${num}th`;
+  }
+
+  if (lastDigit === 1) {
+    return `${num}st`;
+  }
+
+  if (lastDigit === 2) {
+    return `${num}nd`;
+  }
+
+  if (lastDigit === 3) {
+    return `${num}rd`;
+  }
+
+  return `${num}th`;
 }
+
+

practice-tdd/get-ordinal-number.test.js

@@ -18,3 +18,33 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   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(132)).toEqual("132nd");
+});
+
+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");
+});
+
+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");
+});
+
+test("should append 'th' for numbers ending in 0 or 4–9", () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(30)).toEqual("30th");
+  expect(getOrdinalNumber(500)).toEqual("500th");
+  expect(getOrdinalNumber(4)).toEqual("4th");
+  expect(getOrdinalNumber(44)).toEqual("44th");
+  expect(getOrdinalNumber(134)).toEqual("134th");
+  expect(getOrdinalNumber(987535)).toEqual("987535th");
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+});

practice-tdd/repeat-str.js

@@ -1,5 +1,10 @@
-export 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";
+export function repeatStr(string, count) {
+  let result = "";
+  if (count < 0) {
+    throw new Error("wrong input");
+  }
+  for (let n = 0; n < count; n++) {
+    result = result + string;
+  }
+  return result;
 }

practice-tdd/repeat-str.test.js

@@ -20,13 +20,30 @@ 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 repeat the string one time", () => {
+  const str = "javascript";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("javascript");
+});
+
 
 // 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 repeat the string 0 times", () => {
+  const str = "Hi there";
+  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 with negative count times", () => {
+  expect(() => repeatStr("hello", -5)).toThrow("wrong input");
+});