From e2ccbc57d027c6079336653289d7e1a6dfeffd73 Mon Sep 17 00:00:00 2001 From: Rhoda Ajiroba Date: Mon, 9 Nov 2026 02:23:25 +0000 Subject: [PATCH] Complete Practice TDD exercises --- practice-tdd/count.js | 2 +- practice-tdd/count.test.js | 19 +++++++++++----- practice-tdd/get-ordinal-number.js | 22 +++++++++++++++++- practice-tdd/get-ordinal-number.test.js | 25 +++++++++++++++++++++ practice-tdd/repeat-str.js | 16 +++++++++---- practice-tdd/repeat-str.test.js | 30 +++++++++++++++---------- 6 files changed, 91 insertions(+), 23 deletions(-) diff --git a/practice-tdd/count.js b/practice-tdd/count.js index 5518c57123..6167d64448 100644 --- a/practice-tdd/count.js +++ b/practice-tdd/count.js @@ -1,3 +1,3 @@ export function countChar(stringOfCharacters, findCharacter) { - return 5 + return stringOfCharacters.split(findCharacter).length - 1; } diff --git a/practice-tdd/count.test.js b/practice-tdd/count.test.js index cb3aaae591..2cb3d240d1 100644 --- a/practice-tdd/count.test.js +++ b/practice-tdd/count.test.js @@ -17,8 +17,17 @@ test("should count multiple occurrences of a character", () => { expect(count).toEqual(5); }); -// Scenario: No Occurrences -// Given the input string `str`, -// 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 exist", () => { + const str = "hello"; + const char = "z"; + + const count = countChar(str, char); + + expect(count).toEqual(0); +}); +test("should count a single occurrence", () => { + expect(countChar("hello", "h")).toEqual(1); +}); +test("should return 0 for an empty string", () => { + expect(countChar("", "a")).toEqual(0); +}); diff --git a/practice-tdd/get-ordinal-number.js b/practice-tdd/get-ordinal-number.js index 5c6291f5ed..81dbae083b 100644 --- a/practice-tdd/get-ordinal-number.js +++ b/practice-tdd/get-ordinal-number.js @@ -1,3 +1,23 @@ export function getOrdinalNumber(num) { - return "1st"; + const lastTwoDigits = num % 100; + + if (lastTwoDigits >= 11 && lastTwoDigits <= 13) { + return `${num}th`; + } + + const lastDigit = num % 10; + + if (lastDigit === 1) { + return `${num}st`; + } + + if (lastDigit === 2) { + return `${num}nd`; + } + + if (lastDigit === 3) { + return `${num}rd`; + } + + return `${num}th`; } diff --git a/practice-tdd/get-ordinal-number.test.js b/practice-tdd/get-ordinal-number.test.js index e23174a187..741bd12905 100644 --- a/practice-tdd/get-ordinal-number.test.js +++ b/practice-tdd/get-ordinal-number.test.js @@ -18,3 +18,28 @@ 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 in 2, except those ending in 12", () => { + expect(getOrdinalNumber(2)).toEqual("2nd"); + expect(getOrdinalNumber(22)).toEqual("22nd"); + expect(getOrdinalNumber(112)).toEqual("112th"); +}); + +test("should append 'rd' for numbers ending in 3, except those ending in 13", () => { + expect(getOrdinalNumber(3)).toEqual("3rd"); + expect(getOrdinalNumber(23)).toEqual("23rd"); + expect(getOrdinalNumber(113)).toEqual("113th"); +}); + +test("should append 'th' for other numbers", () => { + expect(getOrdinalNumber(4)).toEqual("4th"); + expect(getOrdinalNumber(5)).toEqual("5th"); + expect(getOrdinalNumber(10)).toEqual("10th"); + expect(getOrdinalNumber(20)).toEqual("20th"); +}); + +test("should append 'th' for numbers ending in 11, 12 and 13", () => { + expect(getOrdinalNumber(11)).toEqual("11th"); + expect(getOrdinalNumber(12)).toEqual("12th"); + expect(getOrdinalNumber(13)).toEqual("13th"); +}); diff --git a/practice-tdd/repeat-str.js b/practice-tdd/repeat-str.js index af273f3b01..d69a92e2e8 100644 --- a/practice-tdd/repeat-str.js +++ b/practice-tdd/repeat-str.js @@ -1,5 +1,13 @@ -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(str, count) { + if (count < 0) { + throw new Error("Count cannot be negative"); + } + + let result = ""; + + for (let i = 0; i < count; i++) { + result += str; + } + + return result; } diff --git a/practice-tdd/repeat-str.test.js b/practice-tdd/repeat-str.test.js index 8a7036102b..1efdf7ab8a 100644 --- a/practice-tdd/repeat-str.test.js +++ b/practice-tdd/repeat-str.test.js @@ -16,17 +16,23 @@ test("should repeat the string count times", () => { expect(repeatedStr).toEqual("hellohellohello"); }); -// 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. +test("should return the original string when count is 1", () => { + const str = "hello"; + const count = 1; -// 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. + const repeatedStr = repeatStr(str, count); -// 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. + expect(repeatedStr).toEqual("hello"); +}); +test("should return an empty string when count is 0", () => { + const str = "hello"; + const count = 0; + + const repeatedStr = repeatStr(str, count); + + expect(repeatedStr).toEqual(""); +}); + +test("should throw an error when count is negative", () => { + expect(() => repeatStr("hello", -1)).toThrow(); +});