Merge pull request #1 from UD-S25-CISC275-Tasks/solved-functions

Solved functions

Author: SaiedaJN

public/tasks/task-functions.md

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+# Task - Functions
+
+Version: 0.0.1
+
+Implement a bunch of functions that work on primitives.

src/functions.test.ts

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+import {
+    add3,
+    fahrenheitToCelius,
+    shout,
+    isQuestion,
+    convertYesNo,
+} from "./functions";
+
+describe("Testing the basic functions", () => {
+    test("(3 pts) Testing the fahrenheitToCelius function", () => {
+        expect(fahrenheitToCelius(32)).toBe(0);
+        expect(fahrenheitToCelius(-40)).toBe(-40);
+        expect(fahrenheitToCelius(-22)).toBe(-30);
+        expect(fahrenheitToCelius(14)).toBe(-10);
+        expect(fahrenheitToCelius(68)).toBe(20);
+        expect(fahrenheitToCelius(86)).toBe(30);
+        expect(fahrenheitToCelius(212)).toBe(100);
+    });
+
+    test("(3 pts) Testing the add3 function", () => {
+        expect(add3(1, 2, 3)).toBe(6);
+        expect(add3(9, 7, 4)).toBe(20);
+        expect(add3(6, -3, 9)).toBe(15);
+        expect(add3(10, 1, -9)).toBe(11);
+        expect(add3(-9, -100, -4)).toBe(0);
+        expect(add3(-1, -1, 1)).toBe(1);
+    });
+
+    test("(3 pts) Testing the shout function", () => {
+        expect(shout("Hello")).toBe("HELLO!");
+        expect(shout("What?")).toBe("WHAT?!");
+        expect(shout("oHo")).toBe("OHO!");
+        expect(shout("AHHHH!!!")).toBe("AHHHH!!!!");
+        expect(shout("")).toBe("!");
+        expect(shout("Please go outside")).toBe("PLEASE GO OUTSIDE!");
+    });
+
+    test("(3 pts) Testing the isQuestion function", () => {
+        expect(isQuestion("Is this a question?")).toBe(true);
+        expect(isQuestion("Who are you?")).toBe(true);
+        expect(isQuestion("WHAT ARE YOU !?")).toBe(true);
+        expect(isQuestion("WHAT IS THIS?!")).toBe(false);
+        expect(isQuestion("OH GOD!")).toBe(false);
+        expect(isQuestion("Oh nevermind, it's fine.")).toBe(false);
+        expect(isQuestion("")).toBe(false);
+    });
+
+    test("(3 pts) Testing the convertYesNo function", () => {
+        expect(convertYesNo("yes")).toBe(true);
+        expect(convertYesNo("YES")).toBe(true);
+        expect(convertYesNo("NO")).toBe(false);
+        expect(convertYesNo("no")).toBe(false);
+        expect(convertYesNo("Apple")).toBe(null);
+        expect(convertYesNo("Bananas")).toBe(null);
+        expect(convertYesNo("Nope")).toBe(null);
+        expect(convertYesNo("Yesterday")).toBe(null);
+        expect(convertYesNo("Maybe")).toBe(null);
+    });
+});

src/functions.ts

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+/**
+* Consumes a single temperature in Fahrenheit (a number) and converts to Celsius
+* using this formula:
+*      C = (F - 32) * 5/9
+*/
+export function fahrenheitToCelius(temperature: number): number {
+   return ((temperature - 32) * 5) / 9;
+}
+
+
+/**
+* Consumes three numbers and produces their sum. BUT you should only add a number
+* if the number is greater than zero.
+*/
+export function add3(first: number, second: number, third: number): number {
+   let sum = 0;
+   if (first > 0) {
+       sum += first;
+   }
+   if (second > 0) {
+       sum += second;
+   }
+   if (third > 0) {
+       sum += third;
+   }
+   return sum;
+}
+
+
+/**
+* Consumes a string and produces the same string in UPPERCASE and with an exclamation
+* mark added to the end.
+*/
+export function shout(message: string): string {
+   let upper: "";
+   upper = message.toUpperCase() + "!";
+   return upper;
+}
+
+
+/**
+* Consumes a string (a message) and returns a boolean if the string ends in a question
+* mark. Do not use an `if` statement in solving this question.
+*/
+export function isQuestion(message: string): boolean {
+   return message.endsWith("?") ? true : false;
+   //return message.endsWith("?")
+}
+
+
+/**
+* Consumes a word (a string) and returns either `true`, `false`, or `null`. If the string
+* is "yes" (upper or lower case), then return `true`. If the string is "no" (again, either
+* upper or lower case), then return `false`. Otherwise, return `null`.
+*/
+export function convertYesNo(word: string): boolean | null {
+   if (word === "yes" || word === "YES") {
+       return true;
+   } else if (word == "no" || word === "NO") {
+       return false;
+   } else {
+       return null;
+   }
+}
+
+
+