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3주차 과제 완료 - 도서 데이터 처리 시스템 #3

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3주차 과제 완료 - 도서 데이터 처리 시스템 #3

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148 changes: 125 additions & 23 deletions index.js
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Original file line number Diff line number Diff line change
@@ -1,9 +1,39 @@
const books = [
{ title: "어린왕자", author: "생텍쥐페리", year: 1943, category: "소설", price: 12000 },
{ title: "1984", author: "조지 오웰", year: 1949, category: "소설", price: 15000 },
{ title: "수학의 정석", author: "홍성대", year: 1966, category: "교육", price: 20000 },
{ title: "코딩 테스트", author: "나동빈", year: 2021, category: "교육", price: 32000 },
{ title: "해리포터", author: "J.K. 롤링", year: 1997, category: "소설", price: 18000 },
{
title: '어린왕자',
author: '생텍쥐페리',
year: 1943,
category: '소설',
price: 12000,
},
{
title: '1984',
author: '조지 오웰',
year: 1949,
category: '소설',
price: 15000,
},
{
title: '수학의 정석',
author: '홍성대',
year: 1966,
category: '교육',
price: 20000,
},
{
title: '코딩 테스트',
author: '나동빈',
year: 2021,
category: '교육',
price: 32000,
},
{
title: '해리포터',
author: 'J.K. 롤링',
year: 1997,
category: '소설',
price: 18000,
},
];

// ─────────────────────────────────────────────
Expand All @@ -19,7 +49,9 @@ const books = [
* getTitlesByCategory(books, "소설") // → ["어린왕자", "1984", "해리포터"]
*/
function getTitlesByCategory(books, category) {
// 여기를 작성하세요
return books
.filter((book) => book.category === category)
.map((book) => book.title);
}

/**
Expand All @@ -31,7 +63,9 @@ function getTitlesByCategory(books, category) {
* getTotalPriceAbove(books, 15000) // → 85000
*/
function getTotalPriceAbove(books, threshold) {
// 여기를 작성하세요
return books
.filter((book) => book.price >= threshold)
.reduce((acc, book) => acc + book.price, 0);
}

/**
Expand All @@ -42,7 +76,7 @@ function getTotalPriceAbove(books, threshold) {
* isAllSameCategory([{ category: "소설" }, { category: "소설" }], "소설") // → true
*/
function isAllSameCategory(books, category) {
// 여기를 작성하세요
return books.every((book) => book.category === category);
}

// ─────────────────────────────────────────────
Expand All @@ -58,7 +92,9 @@ function isAllSameCategory(books, category) {
* formatBookLabel({ title: "어린왕자", author: "생텍쥐페리" }) // → "어린왕자 - 생텍쥐페리"
*/
function formatBookLabel(book) {
// 여기를 작성하세요
const { title, author } = book;

return `${title} - ${author}`;
}

/**
Expand All @@ -69,7 +105,9 @@ function formatBookLabel(book) {
* const { first, rest } = splitFirstAndRest(books)
*/
function splitFirstAndRest(books) {
// 여기를 작성하세요
const [first, ...rest] = books;

return { first, rest };
}

/**
Expand All @@ -81,7 +119,8 @@ function splitFirstAndRest(books) {
* omitPrice({ title: "어린왕자", price: 12000 }) // → { title: "어린왕자" }
*/
function omitPrice(book) {
// 여기를 작성하세요
const { price, ...rest } = book;
return rest;
}

// ─────────────────────────────────────────────
Expand All @@ -96,7 +135,17 @@ function omitPrice(book) {
* // → Map { "소설" => ["어린왕자", "1984", "해리포터"], "교육" => [...] }
*/
function groupByCategory(books) {
// 여기를 작성하세요
const result = new Map();

for (const book of books) {
if (!result.has(book.category)) {
result.set(book.category, []);
}

result.get(book.category).push(book.title);
}

return result;
}

/**
Expand All @@ -108,7 +157,9 @@ function groupByCategory(books) {
* intersection([1, 2, 3], [2, 3, 4]) // → [2, 3]
*/
function intersection(arrA, arrB) {
// 여기를 작성하세요
const setB = new Set(arrB);

return [...new Set(arrA.filter((item) => setB.has(item)))];
}

/**
Expand All @@ -119,7 +170,7 @@ function intersection(arrA, arrB) {
* unique([1, 2, 2, 3]) // → [1, 2, 3]
*/
function unique(arr) {
// 여기를 작성하세요
return [...new Set(arr)];
}

// ─────────────────────────────────────────────
Expand All @@ -134,7 +185,9 @@ function unique(arr) {
* getOutOfStock({ 어린왕자: 3, "1984": 0 }) // → ["1984"]
*/
function getOutOfStock(stock) {
// 여기를 작성하세요
return Object.entries(stock)
.filter(([title, quantity]) => quantity === 0)
.map(([title, quantity]) => title);
}

/**
Expand All @@ -145,7 +198,7 @@ function getOutOfStock(stock) {
* getTotalStock({ 어린왕자: 3, "1984": 0, 해리포터: 2 }) // → 5
*/
function getTotalStock(stock) {
// 여기를 작성하세요
return Object.values(stock).reduce((sum, quantity) => sum + quantity, 0);
}

/**
Expand All @@ -156,7 +209,11 @@ function getTotalStock(stock) {
* removeNullish({ title: "어린왕자", author: null }) // → { title: "어린왕자" }
*/
function removeNullish(obj) {
// 여기를 작성하세요
return Object.fromEntries(
Object.entries(obj).filter(
([key, value]) => value !== null && value !== undefined,
),
);
}

// ─────────────────────────────────────────────
Expand All @@ -174,7 +231,28 @@ function removeNullish(obj) {
* getAvgPriceByCategory(books) // → { 소설: 15000, 교육: 26000 }
*/
function getAvgPriceByCategory(books) {
// 여기를 작성하세요
const grouped = books.reduce((acc, book) => {
const { category, price } = book;

if (!acc[category]) {
acc[category] = {
sum: 0,
count: 0,
};
}

acc[category].sum += price;
acc[category].count += 1;

return acc;
}, {});

return Object.fromEntries(
Object.entries(grouped).map(([category, info]) => [
category,
info.sum / info.count,
]),
);
}

/**
Expand All @@ -187,7 +265,11 @@ function getAvgPriceByCategory(books) {
* sortBy(books, "title") // → 제목 가나다순 새 배열
*/
function sortBy(books, key) {
// 여기를 작성하세요
return [...books].sort((a, b) => {
if (a[key] > b[key]) return 1;
if (a[key] < b[key]) return -1;
return 0;
});
}

/**
Expand All @@ -202,7 +284,12 @@ function sortBy(books, key) {
* // → [{ title: "어린왕자", price: 12000, category: "소설" }]
*/
function flattenCategories(categories) {
// 여기를 작성하세요
return categories.flatMap((categoryGroup) =>
categoryGroup.books.map((book) => ({
...book,
category: categoryGroup.category,
})),
);
}

// ─────────────────────────────────────────────
Expand All @@ -222,8 +309,10 @@ function flattenCategories(categories) {
*
* for (const book of createBookIterator(books)) { ... }
*/
function createBookIterator(books) {
// 여기를 작성하세요
function* createBookIterator(books) {
for (const book of books) {
yield book;
}
}

/**
Expand All @@ -236,7 +325,20 @@ function createBookIterator(books) {
* paginate(books, 1, 2) // → { data: [books[0], books[1]], totalPages: 3, currentPage: 1 }
*/
function paginate(books, page, size) {
// 여기를 작성하세요
const totalPages = Math.ceil(books.length / size);

if (page < 1 || page > totalPages) {
throw new Error('유효하지 않은 페이지 번호입니다.');
}

const start = (page - 1) * size;
const end = start + size;

return {
data: books.slice(start, end),
totalPages,
currentPage: page,
};
}

// ─────────────────────────────────────────────
Expand Down
30 changes: 0 additions & 30 deletions package-lock.json
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