From 83db2f1da932e815fc61f45853953a697ebb189f Mon Sep 17 00:00:00 2001 From: SalahAlsabhi Date: Sun, 11 Oct 2026 07:14:43 +0100 Subject: [PATCH 1/3] TDD: implement countChar with tests --- practice-tdd/count.js | 12 +++++++++++- practice-tdd/count.test.js | 14 ++++++++++++++ 2 files changed, 25 insertions(+), 1 deletion(-) diff --git a/practice-tdd/count.js b/practice-tdd/count.js index 5518c5712..f8bf1eb4a 100644 --- a/practice-tdd/count.js +++ b/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; } + diff --git a/practice-tdd/count.test.js b/practice-tdd/count.test.js index cb3aaae59..d311d1cde 100644 --- a/practice-tdd/count.test.js +++ b/practice-tdd/count.test.js @@ -22,3 +22,17 @@ 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 multiple occurrences of a character including upper cases", () => { + 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); +}); From 4bd5c1e155938c53fca73bf738e93d5c587f8218 Mon Sep 17 00:00:00 2001 From: SalahAlsabhi Date: Sun, 11 Oct 2026 10:00:10 +0100 Subject: [PATCH 2/3] TDD: implement repeatStr with tests --- practice-tdd/repeat-str.js | 13 +++++++++---- practice-tdd/repeat-str.test.js | 17 +++++++++++++++++ 2 files changed, 26 insertions(+), 4 deletions(-) diff --git a/practice-tdd/repeat-str.js b/practice-tdd/repeat-str.js index af273f3b0..72fc1a8ee 100644 --- a/practice-tdd/repeat-str.js +++ b/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; } diff --git a/practice-tdd/repeat-str.test.js b/practice-tdd/repeat-str.test.js index 8a7036102..0f3dd17d0 100644 --- a/practice-tdd/repeat-str.test.js +++ b/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"); +}); From 1e25c6e837370c73dbb55cd65c124d4da0f2cdfe Mon Sep 17 00:00:00 2001 From: SalahAlsabhi Date: Sun, 11 Oct 2026 18:05:45 +0100 Subject: [PATCH 3/3] TDD: implement getOrdinalNumber with category tests --- practice-tdd/get-ordinal-number.js | 10 ++++++++- practice-tdd/get-ordinal-number.test.js | 30 +++++++++++++++++++++++++ 2 files changed, 39 insertions(+), 1 deletion(-) diff --git a/practice-tdd/get-ordinal-number.js b/practice-tdd/get-ordinal-number.js index 5c6291f5e..e5b3bf1ec 100644 --- a/practice-tdd/get-ordinal-number.js +++ b/practice-tdd/get-ordinal-number.js @@ -1,3 +1,11 @@ export function getOrdinalNumber(num) { - return "1st"; + return num % 100 === 11 || num % 100 === 12 || num % 100 === 13 + ? `${num}th` + : num % 10 === 1 + ? `${num}st` + : num % 10 === 2 + ? `${num}nd` + : num % 10 === 3 + ? `${num}rd` + : `${num}th`; } diff --git a/practice-tdd/get-ordinal-number.test.js b/practice-tdd/get-ordinal-number.test.js index e23174a18..638e9487f 100644 --- a/practice-tdd/get-ordinal-number.test.js +++ b/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 with 0, 4, or big numbers.", () => { + 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"); +});