[Devcon 2024] 소프트웨어 파괴의 미학

function primeSum(n: number): number { let sum = 0; for (let i = 2; i <= n; i++) { let isPrime = true; // 소수 여부 체크와 동시에 합산 for (let j = 2; j < i; j++) { if (i % j === 0) { isPrime = false; break; } } if (isPrime) { sum += i; } } return sum; } function main() { console.log(primeSum(10)); // 2 + 3 + 5 + 7 = 17 } main();

// 전처리: 소수 리스트 생성 function makePrimeList(n: number): number[] { const primes: number[] = []; for (let i = 2; i <= n; i++) { let isPrime = true; // 소수 여부 체크 for (let j = 2; j < i; j++) { if (i % j === 0) { isPrime = false; break; } } if (isPrime) { primes.push(i); } } return primes; } // 계산: 리스트의 합 계산 function listSum(list: number[]): number { return list.reduce((acc, cur) => acc + cur, 0); } // 후처리: 결과 출력 function main() { const primes = makePrimeList(10); // 소수 리스트 생성 const sum = listSum(primes); // 소수의 합 계산 console.log(sum); // 17 출력 } main();

let globalValue = 5; function addWithSideEffect(a: number): number { globalValue += a; return globalValue; } console.log(addWithSideEffect(3)); // 결과는 8 console.log(addWithSideEffect(3)); // 결과는 11, 외부 상태(globalValue)가 변경됨

function add(a: number, b: number): number { return a + b; } console.log(add(2, 3)); // 항상 5를 반환 console.log(add(2, 3)); // 항상 5를 반환

class UserInfo { userId: number; userName: string; email: string; telephone: string; provinceAddress: string; // 도 cityAddress: string; // 시 regionAddress: string; // 구 detailAddress: string; // 상세 주소 avatarUrl: string; constructor( userId: number, userName: string, email: string, telephone: string, provinceAddress: string, cityAddress: string, regionAddress: string, detailAddress: string, avatarUrl: string, ) { this.userId = userId; this.userName = userName; this.email = email; this.telephone = telephone; this.provinceAddress = provinceAddress; this.cityAddress = cityAddress; this.regionAddress = regionAddress; this.detailAddress = detailAddress; this.avatarUrl = avatarUrl; } }

interface Appliance { turnOn(): void; turnOff(): void; setTimer(minutes: number): void; heatUp(temperature: number): void; // 전자레인지만 해당 brewCoffee(): void; // 커피 머신만 해당 } class Microwave implements Appliance { turnOn() { console.log("Microwave is now on."); } turnOff() { console.log("Microwave is now off."); } setTimer(minutes: number) { console.log(`Microwave timer set for ${minutes} minutes.`); } heatUp(temperature: number) { console.log(`Microwave heating up to ${temperature} degrees.`); } brewCoffee() { // 구현되지 않음 } } class CoffeeMachine implements Appliance { turnOn() { console.log("Coffee Machine is now on."); } turnOff() { console.log("Coffee Machine is now off."); } setTimer(minutes: number) { // 구현되지 않음 } heatUp(temperature: number) { // 구현되지 않음 } brewCoffee() { console.log("Brewing coffee."); } }

interface Switchable { turnOn(): void; turnOff(): void; } interface Timer { setTimer(minutes: number): void; } interface Heatable { heatUp(temperature: number): void; } interface CoffeeBrewer { brewCoffee(): void; } class Microwave implements Switchable, Timer, Heatable { turnOn() { console.log("Microwave is now on."); } turnOff() { console.log("Microwave is now off."); } setTimer(minutes: number) { console.log(`Microwave timer set for ${minutes} minutes.`); } heatUp(temperature: number) { console.log(`Microwave heating up to ${temperature} degrees.`); } } class CoffeeMachine implements Switchable, CoffeeBrewer { turnOn() { console.log("Coffee Machine is now on."); } turnOff() { console.log("Coffee Machine is now off."); } brewCoffee() { console.log("Brewing coffee."); } }

class Object { oldMethod1() { // ... } oldMethod2() { // ... } }

class LegacyObject { oldMethod1() { // ... } oldMethod2() { // ... } } class NewObject { private legacyObject: LegacyObject; constructor() { this.legacyObject = new LegacyObject(); } newMethod1() { // ... } oldMethod2() { this.legacyObject.oldMethod2(); } }

class NewObject2 { newMethod1() { // ... } newMethod2() { // ... } }