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1817 lines (1702 loc) · 74.4 KB
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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Ch.11 OOP & 패러다임 | CS Visualizer</title>
<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;700&display=swap" rel="stylesheet">
<link rel="stylesheet" href="style.css">
<style>
/* ── Ch11 Local Styles ────────────────────── */
.tag-ch11 { background: rgba(245,158,11,0.15); color: #f59e0b; border: 1px solid rgba(245,158,11,0.3); }
/* OOP Cards */
.oop-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
gap: 16px;
margin-top: 20px;
}
.oop-card {
background: var(--surface);
border: 1px solid var(--border);
border-radius: var(--radius);
overflow: hidden;
cursor: pointer;
transition: all 0.3s;
}
.oop-card:hover { border-color: #f59e0b; box-shadow: 0 0 20px rgba(245,158,11,0.12); }
.oop-card.active { border-color: #f59e0b; }
.oop-card-header {
padding: 20px;
display: flex;
align-items: center;
gap: 14px;
}
.oop-icon {
width: 44px; height: 44px;
border-radius: 10px;
display: flex; align-items: center; justify-content: center;
font-size: 1.3rem;
flex-shrink: 0;
}
.oop-card-title { font-weight: 700; font-size: 1rem; }
.oop-card-sub { font-size: 0.75rem; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; margin-top: 2px; }
.oop-card-desc { padding: 0 20px 16px; font-size: 0.85rem; color: var(--text-dim); line-height: 1.6; }
.oop-expand {
max-height: 0;
overflow: hidden;
transition: max-height 0.4s ease;
}
.oop-expand.open { max-height: 900px; }
.oop-expand-inner {
padding: 0 20px 20px;
border-top: 1px solid var(--border);
}
.oop-code {
background: var(--bg);
border-radius: 8px;
padding: 14px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.75rem;
line-height: 1.8;
color: var(--text-dim);
margin-top: 12px;
overflow-x: auto;
}
.oop-code .kw { color: #f59e0b; }
.oop-code .cls { color: var(--accent3); }
.oop-code .fn { color: var(--accent); }
.oop-code .str { color: var(--accent2); }
.oop-code .cmt { color: #4a4a6a; }
.oop-code .num { color: var(--accent4); }
/* Inheritance diagram */
.inherit-diagram {
display: flex;
flex-direction: column;
align-items: center;
gap: 0;
margin-top: 16px;
padding: 10px;
}
.inherit-node {
background: var(--surface2);
border: 2px solid var(--border);
border-radius: 8px;
padding: 10px 20px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
font-weight: 600;
text-align: center;
transition: all 0.3s;
}
.inherit-node.root { border-color: #f59e0b; color: #f59e0b; }
.inherit-node.child { border-color: var(--accent3); color: var(--accent3); }
.inherit-arrow {
width: 2px;
height: 28px;
background: var(--border);
position: relative;
}
.inherit-arrow::after {
content: '▼';
position: absolute;
bottom: -10px;
left: 50%;
transform: translateX(-50%);
font-size: 0.6rem;
color: var(--text-dim);
}
.inherit-children {
display: flex;
gap: 24px;
position: relative;
}
.inherit-children::before {
content: '';
position: absolute;
top: -14px;
left: 50%;
transform: translateX(-50%);
width: calc(100% - 60px);
height: 2px;
background: var(--border);
}
.inherit-child-wrap {
display: flex;
flex-direction: column;
align-items: center;
gap: 0;
}
.inherit-child-connector {
width: 2px;
height: 14px;
background: var(--border);
}
/* Polymorphism viz */
.poly-demo {
display: flex;
flex-direction: column;
gap: 8px;
margin-top: 12px;
}
.poly-row {
display: flex;
align-items: center;
gap: 10px;
background: var(--bg);
border-radius: 8px;
padding: 10px 14px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.75rem;
}
.poly-label { color: var(--accent3); min-width: 80px; font-weight: 600; }
.poly-method { color: var(--text-dim); }
.poly-result { color: var(--accent); margin-left: auto; }
/* Abstraction viz */
.abstract-layers {
display: flex;
flex-direction: column;
gap: 0;
margin-top: 12px;
}
.abstract-layer {
padding: 10px 16px;
font-size: 0.78rem;
font-family: 'JetBrains Mono', monospace;
border-left: 3px solid;
margin-bottom: 6px;
border-radius: 0 6px 6px 0;
}
/* Encapsulation viz */
.encap-viz {
background: var(--bg);
border-radius: 10px;
padding: 16px;
margin-top: 12px;
position: relative;
}
.encap-outer {
border: 2px dashed #f59e0b;
border-radius: 8px;
padding: 12px;
position: relative;
}
.encap-outer-label {
position: absolute;
top: -10px; left: 12px;
background: var(--bg);
padding: 0 6px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.65rem;
color: #f59e0b;
}
.encap-private { color: var(--danger); font-size: 0.72rem; font-family: 'JetBrains Mono', monospace; margin: 4px 0; }
.encap-public { color: var(--accent); font-size: 0.72rem; font-family: 'JetBrains Mono', monospace; margin: 4px 0; }
/* SOLID Cards */
.solid-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
gap: 16px;
margin-top: 20px;
}
.solid-card {
background: var(--surface);
border: 1px solid var(--border);
border-radius: var(--radius);
overflow: hidden;
cursor: pointer;
transition: all 0.3s;
min-height: 160px;
position: relative;
}
.solid-card:hover { border-color: #f59e0b; }
.solid-card-front, .solid-card-back {
padding: 20px;
position: absolute;
top: 0; left: 0; right: 0; bottom: 0;
transition: opacity 0.35s, transform 0.35s;
display: flex;
flex-direction: column;
}
.solid-card-back {
opacity: 0;
pointer-events: none;
transform: translateY(12px);
background: var(--surface2);
}
.solid-card.flipped .solid-card-front {
opacity: 0;
transform: translateY(-12px);
pointer-events: none;
}
.solid-card.flipped .solid-card-back {
opacity: 1;
pointer-events: all;
transform: translateY(0);
}
.solid-letter {
font-family: 'JetBrains Mono', monospace;
font-size: 2.2rem;
font-weight: 700;
color: #f59e0b;
line-height: 1;
}
.solid-name { font-weight: 700; font-size: 0.95rem; margin-top: 6px; }
.solid-sub { font-size: 0.75rem; color: var(--text-dim); margin-top: 4px; font-family: 'JetBrains Mono', monospace; }
.solid-desc { font-size: 0.82rem; color: var(--text-dim); margin-top: 10px; line-height: 1.6; }
.solid-flip-hint {
margin-top: auto;
font-size: 0.7rem;
color: var(--text-dim);
font-family: 'JetBrains Mono', monospace;
opacity: 0.6;
}
.solid-back-label {
font-family: 'JetBrains Mono', monospace;
font-size: 0.65rem;
margin-bottom: 6px;
padding: 2px 8px;
border-radius: 4px;
display: inline-block;
align-self: flex-start;
}
.solid-bad { background: rgba(255,68,102,0.15); color: var(--danger); border: 1px solid rgba(255,68,102,0.3); }
.solid-good { background: rgba(0,255,170,0.1); color: var(--accent); border: 1px solid rgba(0,255,170,0.2); }
.solid-code {
background: var(--bg);
border-radius: 6px;
padding: 10px 12px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.68rem;
line-height: 1.75;
color: var(--text-dim);
margin-top: 8px;
overflow-x: auto;
flex: 1;
}
.solid-code .kw { color: #f59e0b; }
.solid-code .cls { color: var(--accent3); }
.solid-code .fn { color: var(--accent); }
.solid-code .cmt { color: #4a4a6a; }
/* Functional section */
.fp-tabs {
display: flex;
gap: 8px;
margin-bottom: 16px;
flex-wrap: wrap;
}
.fp-tab {
padding: 7px 16px;
border-radius: 20px;
border: 1px solid var(--border);
background: transparent;
color: var(--text-dim);
cursor: pointer;
font-family: 'JetBrains Mono', monospace;
font-size: 0.75rem;
transition: all 0.2s;
}
.fp-tab:hover { border-color: #f59e0b; color: #f59e0b; }
.fp-tab.active { background: rgba(245,158,11,0.15); border-color: #f59e0b; color: #f59e0b; }
.fp-panel { display: none; }
.fp-panel.active { display: block; }
.fp-compare {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 12px;
}
@media (max-width: 640px) { .fp-compare { grid-template-columns: 1fr; } }
.fp-box {
background: var(--bg);
border-radius: 8px;
padding: 14px;
}
.fp-box-label {
font-family: 'JetBrains Mono', monospace;
font-size: 0.65rem;
margin-bottom: 8px;
padding: 2px 8px;
border-radius: 4px;
display: inline-block;
}
.fp-code {
font-family: 'JetBrains Mono', monospace;
font-size: 0.73rem;
line-height: 1.8;
color: var(--text-dim);
white-space: pre;
overflow-x: auto;
}
.fp-code .kw { color: var(--accent3); }
.fp-code .fn { color: var(--accent); }
.fp-code .cmt { color: #4a4a6a; }
.fp-code .str { color: var(--accent2); }
.fp-code .num { color: var(--accent4); }
.fp-code .bad { color: var(--danger); }
.fp-code .good { color: var(--accent); }
/* HOF playground */
.hof-playground {
margin-top: 16px;
}
.hof-input-row {
display: flex;
gap: 10px;
align-items: center;
flex-wrap: wrap;
margin-bottom: 14px;
}
.hof-input {
background: var(--bg);
border: 1px solid var(--border);
border-radius: 8px;
padding: 8px 14px;
color: var(--text);
font-family: 'JetBrains Mono', monospace;
font-size: 0.82rem;
width: 260px;
outline: none;
transition: border-color 0.2s;
}
.hof-input:focus { border-color: #f59e0b; }
.hof-ops {
display: flex;
gap: 8px;
flex-wrap: wrap;
margin-bottom: 14px;
}
.hof-op-btn {
padding: 6px 14px;
border-radius: 6px;
border: 1px solid var(--border);
background: var(--surface2);
color: var(--text-dim);
cursor: pointer;
font-family: 'JetBrains Mono', monospace;
font-size: 0.75rem;
transition: all 0.2s;
}
.hof-op-btn.active { border-color: #f59e0b; color: #f59e0b; background: rgba(245,158,11,0.1); }
.hof-step {
display: flex;
align-items: center;
gap: 10px;
padding: 10px 14px;
background: var(--bg);
border-radius: 8px;
margin-bottom: 8px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.75rem;
flex-wrap: wrap;
}
.hof-step-label {
color: #f59e0b;
min-width: 90px;
font-weight: 600;
}
.hof-step-arrow { color: var(--text-dim); }
.hof-step-val { color: var(--accent); }
.hof-result {
padding: 12px 16px;
background: rgba(0,255,170,0.07);
border: 1px solid rgba(0,255,170,0.2);
border-radius: 8px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.85rem;
margin-top: 10px;
}
/* Compose demo */
.compose-flow {
display: flex;
align-items: center;
gap: 8px;
flex-wrap: wrap;
margin: 14px 0;
}
.compose-fn-box {
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 8px;
padding: 8px 14px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
text-align: center;
}
.compose-fn-name { color: var(--accent3); font-weight: 600; }
.compose-fn-desc { color: var(--text-dim); font-size: 0.65rem; margin-top: 2px; }
.compose-arrow { color: var(--text-dim); font-size: 1.1rem; }
.compose-input-val { color: #f59e0b; font-weight: 700; }
.compose-output-val { color: var(--accent); font-weight: 700; }
/* Paradigm comparison */
.paradigm-tabs {
display: flex;
gap: 0;
margin-bottom: 0;
border-radius: var(--radius) var(--radius) 0 0;
overflow: hidden;
border: 1px solid var(--border);
border-bottom: none;
}
.paradigm-tab {
flex: 1;
padding: 12px;
background: var(--surface);
border: none;
color: var(--text-dim);
cursor: pointer;
font-family: 'JetBrains Mono', monospace;
font-size: 0.8rem;
font-weight: 600;
transition: all 0.2s;
border-right: 1px solid var(--border);
text-align: center;
}
.paradigm-tab:last-child { border-right: none; }
.paradigm-tab.active { background: var(--surface2); color: #f59e0b; }
.paradigm-tab:hover:not(.active) { background: var(--surface2); color: var(--text); }
.paradigm-panel {
display: none;
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 0 0 var(--radius) var(--radius);
padding: 20px;
}
.paradigm-panel.active { display: block; }
.paradigm-code {
background: var(--bg);
border-radius: 8px;
padding: 16px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
line-height: 1.85;
color: var(--text-dim);
white-space: pre;
overflow-x: auto;
margin-top: 12px;
}
.paradigm-code .kw { color: #f59e0b; }
.paradigm-code .cls { color: var(--accent3); }
.paradigm-code .fn { color: var(--accent); }
.paradigm-code .num { color: var(--accent4); }
.paradigm-code .cmt { color: #4a4a6a; }
.paradigm-code .str { color: var(--accent2); }
.pros-cons {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 10px;
margin-top: 16px;
}
@media (max-width: 560px) { .pros-cons { grid-template-columns: 1fr; } }
.pros-box, .cons-box {
background: var(--bg);
border-radius: 8px;
padding: 12px 14px;
}
.pros-box { border-left: 3px solid var(--accent); }
.cons-box { border-left: 3px solid var(--danger); }
.pc-title {
font-family: 'JetBrains Mono', monospace;
font-size: 0.7rem;
font-weight: 700;
margin-bottom: 8px;
}
.pros-box .pc-title { color: var(--accent); }
.cons-box .pc-title { color: var(--danger); }
.pc-list { list-style: none; }
.pc-list li {
font-size: 0.78rem;
color: var(--text-dim);
padding: 3px 0;
padding-left: 14px;
position: relative;
}
.pc-list li::before { content: '·'; position: absolute; left: 0; }
/* Comparison table */
.cmp-table {
width: 100%;
border-collapse: collapse;
margin-top: 20px;
font-size: 0.8rem;
}
.cmp-table th {
padding: 10px 14px;
background: var(--surface2);
border: 1px solid var(--border);
font-family: 'JetBrains Mono', monospace;
font-weight: 600;
text-align: left;
}
.cmp-table th:first-child { color: var(--text-dim); }
.cmp-table th:nth-child(2) { color: var(--accent4); }
.cmp-table th:nth-child(3) { color: var(--accent3); }
.cmp-table th:nth-child(4) { color: var(--accent); }
.cmp-table td {
padding: 9px 14px;
border: 1px solid var(--border);
color: var(--text-dim);
vertical-align: top;
line-height: 1.5;
}
.cmp-table tr:hover td { background: var(--surface2); }
/* Badges */
.badge {
display: inline-block;
padding: 2px 8px;
border-radius: 4px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.65rem;
font-weight: 600;
margin-right: 4px;
margin-bottom: 2px;
}
.badge-yellow { background: rgba(245,158,11,0.15); color: #f59e0b; }
.badge-blue { background: rgba(107,138,255,0.15); color: var(--accent3); }
.badge-green { background: rgba(0,255,170,0.12); color: var(--accent); }
/* Toggle btn */
.toggle-switch {
display: flex;
align-items: center;
gap: 12px;
margin-bottom: 14px;
}
.toggle-label { font-size: 0.8rem; font-family: 'JetBrains Mono', monospace; }
.toggle-btn {
position: relative;
width: 48px; height: 26px;
background: var(--border);
border-radius: 13px;
cursor: pointer;
transition: background 0.2s;
border: none;
outline: none;
}
.toggle-btn.on { background: #f59e0b; }
.toggle-btn::after {
content: '';
position: absolute;
top: 3px; left: 3px;
width: 20px; height: 20px;
background: #fff;
border-radius: 50%;
transition: transform 0.2s;
}
.toggle-btn.on::after { transform: translateX(22px); }
/* Immutable demo */
.immut-ops {
display: flex;
flex-wrap: wrap;
gap: 8px;
margin-bottom: 14px;
}
.immut-state {
background: var(--bg);
border-radius: 8px;
padding: 12px 16px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
margin-bottom: 8px;
}
.immut-label { color: var(--text-dim); font-size: 0.67rem; margin-bottom: 4px; }
.immut-val { color: var(--accent); }
.immut-val.old { color: var(--text-dim); text-decoration: line-through; }
.btn-sm {
padding: 6px 14px;
border-radius: 6px;
border: 1px solid var(--border);
background: var(--surface2);
color: var(--text-dim);
cursor: pointer;
font-family: 'JetBrains Mono', monospace;
font-size: 0.73rem;
transition: all 0.2s;
}
.btn-sm:hover { border-color: #f59e0b; color: #f59e0b; }
/* Run button */
.run-btn {
padding: 8px 20px;
background: rgba(245,158,11,0.15);
border: 1px solid rgba(245,158,11,0.4);
border-radius: 8px;
color: #f59e0b;
cursor: pointer;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
font-weight: 600;
transition: all 0.2s;
}
.run-btn:hover { background: rgba(245,158,11,0.25); }
/* Pulse anim */
@keyframes pulse-border {
0%, 100% { border-color: rgba(245,158,11,0.3); }
50% { border-color: rgba(245,158,11,0.8); }
}
.oop-card.active { animation: pulse-border 2s ease infinite; }
</style>
</head>
<body class="page-body">
<!-- NAV -->
<nav class="page-nav">
<a href="index.html" class="nav-back">← 홈</a>
<div class="nav-chapter-title" style="color:#f59e0b">Ch.11 — OOP & 패러다임</div>
<div class="nav-sections">
<a href="#oop" class="nav-sec-link">OOP 4원칙</a>
<a href="#solid" class="nav-sec-link">SOLID</a>
<a href="#functional" class="nav-sec-link">함수형</a>
<a href="#paradigm" class="nav-sec-link">패러다임 비교</a>
</div>
</nav>
<!-- ══════════════════════════════════════════
SECTION 1: OOP 4원칙
═══════════════════════════════════════════ -->
<section id="oop">
<div class="section-header">
<div class="tag tag-ch11">01 — OBJECT ORIENTED PROGRAMMING</div>
<h2>객체지향 4원칙</h2>
<p>객체지향 프로그래밍(OOP)은 데이터와 동작을 객체라는 단위로 묶어 소프트웨어를 설계하는 패러다임입니다. 4가지 핵심 원칙을 통해 유지보수성, 재사용성, 확장성을 달성합니다.</p>
</div>
<div class="viz-box">
<div class="oop-grid">
<!-- 캡슐화 -->
<div class="oop-card" id="card-encap" onclick="toggleOOP('encap')">
<div class="oop-card-header">
<div class="oop-icon" style="background:rgba(245,158,11,0.15)">🔒</div>
<div>
<div class="oop-card-title">캡슐화</div>
<div class="oop-card-sub">Encapsulation</div>
</div>
</div>
<div class="oop-card-desc">데이터(속성)와 메서드를 하나의 단위로 묶고, 내부 구현을 외부에서 직접 접근하지 못하도록 보호합니다.</div>
<div class="oop-expand" id="expand-encap">
<div class="oop-expand-inner">
<div class="encap-viz">
<div class="encap-outer">
<div class="encap-outer-label">BankAccount 클래스</div>
<div class="encap-private">🔴 private _balance = 0</div>
<div class="encap-private">🔴 private _pin = "1234"</div>
<div style="height:8px;border-top:1px dashed rgba(255,255,255,0.1);margin:8px 0;"></div>
<div class="encap-public">🟢 public deposit(amount)</div>
<div class="encap-public">🟢 public withdraw(amount)</div>
<div class="encap-public">🟢 public getBalance()</div>
</div>
</div>
<div class="oop-code">
<span class="kw">class</span> <span class="cls">BankAccount</span> {
<span class="cmt">// private - 외부 직접 접근 불가</span>
#balance = <span class="num">0</span>;
#pin;
<span class="fn">constructor</span>(pin) {
<span class="kw">this</span>.#pin = pin;
}
<span class="cmt">// public - 공개 인터페이스</span>
<span class="fn">deposit</span>(amount) {
<span class="kw">if</span> (amount > <span class="num">0</span>) <span class="kw">this</span>.#balance += amount;
}
<span class="fn">getBalance</span>() {
<span class="kw">return</span> <span class="kw">this</span>.#balance;
}
}
</div>
<div class="info-text" style="margin-top:10px">
내부 잔액(#balance)에 직접 접근 불가 → getBalance()를 통해서만 조회 가능. 데이터 무결성을 보장합니다.
</div>
</div>
</div>
</div>
<!-- 상속 -->
<div class="oop-card" id="card-inherit" onclick="toggleOOP('inherit')">
<div class="oop-card-header">
<div class="oop-icon" style="background:rgba(107,138,255,0.15)">🔗</div>
<div>
<div class="oop-card-title">상속</div>
<div class="oop-card-sub">Inheritance</div>
</div>
</div>
<div class="oop-card-desc">기존 클래스(부모)의 속성과 메서드를 새로운 클래스(자식)가 물려받아 코드 재사용성을 높입니다.</div>
<div class="oop-expand" id="expand-inherit">
<div class="oop-expand-inner">
<div class="inherit-diagram">
<div class="inherit-node root">🐾 Animal<br><span style="font-size:0.6rem;color:var(--text-dim)">speak() · eat()</span></div>
<div class="inherit-arrow"></div>
<div style="height:14px;"></div>
<div class="inherit-children">
<div class="inherit-child-wrap">
<div class="inherit-child-connector"></div>
<div class="inherit-node child">🐶 Dog<br><span style="font-size:0.6rem;color:var(--text-dim)">speak(): "멍멍"</span></div>
</div>
<div class="inherit-child-wrap">
<div class="inherit-child-connector"></div>
<div class="inherit-node child">🐱 Cat<br><span style="font-size:0.6rem;color:var(--text-dim)">speak(): "야옹"</span></div>
</div>
<div class="inherit-child-wrap">
<div class="inherit-child-connector"></div>
<div class="inherit-node child">🐦 Bird<br><span style="font-size:0.6rem;color:var(--text-dim)">speak(): "짹짹"</span></div>
</div>
</div>
</div>
<div class="oop-code">
<span class="kw">class</span> <span class="cls">Animal</span> {
<span class="fn">constructor</span>(name) { <span class="kw">this</span>.name = name; }
<span class="fn">eat</span>() { <span class="kw">return</span> <span class="str">`${this.name}이 먹습니다`</span>; }
<span class="fn">speak</span>() { <span class="kw">return</span> <span class="str">'...'</span>; }
}
<span class="kw">class</span> <span class="cls">Dog</span> <span class="kw">extends</span> <span class="cls">Animal</span> {
<span class="fn">speak</span>() { <span class="kw">return</span> <span class="str">`${this.name}: 멍멍!`</span>; }
}
<span class="kw">class</span> <span class="cls">Cat</span> <span class="kw">extends</span> <span class="cls">Animal</span> {
<span class="fn">speak</span>() { <span class="kw">return</span> <span class="str">`${this.name}: 야옹~`</span>; }
}
</div>
<div class="info-text" style="margin-top:10px">
Dog/Cat 모두 eat()을 재정의 없이 사용 가능. extends 키워드로 부모 클래스를 상속합니다.
</div>
</div>
</div>
</div>
<!-- 다형성 -->
<div class="oop-card" id="card-poly" onclick="toggleOOP('poly')">
<div class="oop-card-header">
<div class="oop-icon" style="background:rgba(255,107,157,0.15)">🔀</div>
<div>
<div class="oop-card-title">다형성</div>
<div class="oop-card-sub">Polymorphism</div>
</div>
</div>
<div class="oop-card-desc">같은 이름의 메서드가 객체 유형에 따라 다르게 동작합니다. 하나의 인터페이스로 여러 구현을 다룹니다.</div>
<div class="oop-expand" id="expand-poly">
<div class="oop-expand-inner">
<div class="poly-demo">
<div style="font-family:'JetBrains Mono',monospace;font-size:0.7rem;color:var(--text-dim);margin-bottom:6px;">animals.forEach(a => a.speak()) 호출 결과:</div>
<div class="poly-row">
<span class="poly-label">🐶 dog</span>
<span class="poly-method">.speak()</span>
<span class="poly-result">"멍멍!"</span>
</div>
<div class="poly-row">
<span class="poly-label">🐱 cat</span>
<span class="poly-method">.speak()</span>
<span class="poly-result">"야옹~"</span>
</div>
<div class="poly-row">
<span class="poly-label">🐦 bird</span>
<span class="poly-method">.speak()</span>
<span class="poly-result">"짹짹!"</span>
</div>
</div>
<div class="oop-code">
<span class="kw">const</span> animals = [
<span class="kw">new</span> <span class="cls">Dog</span>(<span class="str">'바둑이'</span>),
<span class="kw">new</span> <span class="cls">Cat</span>(<span class="str">'나비'</span>),
<span class="kw">new</span> <span class="cls">Bird</span>(<span class="str">'참새'</span>),
];
<span class="cmt">// 동일한 speak() 메서드 호출</span>
<span class="cmt">// → 각 객체 유형에 따라 다르게 동작</span>
animals.<span class="fn">forEach</span>(a => console.<span class="fn">log</span>(a.<span class="fn">speak</span>()));
<span class="cmt">// "바둑이: 멍멍!"</span>
<span class="cmt">// "나비: 야옹~"</span>
<span class="cmt">// "참새: 짹짹!"</span>
</div>
<div class="info-text" style="margin-top:10px">
호출 코드는 구체적 타입을 몰라도 됩니다. 새로운 Animal 하위 클래스를 추가해도 루프 코드 변경 없음.
</div>
</div>
</div>
</div>
<!-- 추상화 -->
<div class="oop-card" id="card-abstract" onclick="toggleOOP('abstract')">
<div class="oop-card-header">
<div class="oop-icon" style="background:rgba(0,255,170,0.12)">🎭</div>
<div>
<div class="oop-card-title">추상화</div>
<div class="oop-card-sub">Abstraction</div>
</div>
</div>
<div class="oop-card-desc">복잡한 내부 구현을 숨기고, 필요한 기능만 단순한 인터페이스로 노출합니다. 복잡성을 관리합니다.</div>
<div class="oop-expand" id="expand-abstract">
<div class="oop-expand-inner">
<div class="abstract-layers">
<div class="abstract-layer" style="border-color:#f59e0b;background:rgba(245,158,11,0.07);color:#f59e0b;">
사용자 코드: car.start()
</div>
<div style="text-align:center;font-size:0.7rem;color:var(--text-dim);margin:-2px 0;">↓ 추상화 경계</div>
<div class="abstract-layer" style="border-color:var(--accent3);background:rgba(107,138,255,0.07);color:var(--accent3);">
Car 인터페이스: start() / stop() / accelerate()
</div>
<div style="text-align:center;font-size:0.7rem;color:var(--text-dim);margin:-2px 0;">↓ 내부 구현 (숨김)</div>
<div class="abstract-layer" style="border-color:var(--text-dim);background:rgba(136,136,170,0.07);color:var(--text-dim);">
엔진점화 → 연료주입 → 크랭크샤프트 → 피스톤 ...
</div>
</div>
<div class="oop-code">
<span class="cmt">// 추상 클래스 / 인터페이스</span>
<span class="kw">abstract class</span> <span class="cls">Shape</span> {
<span class="kw">abstract</span> <span class="fn">area</span>(): number; <span class="cmt">// 구현 강제</span>
<span class="kw">abstract</span> <span class="fn">perimeter</span>(): number;
<span class="fn">describe</span>() {
<span class="kw">return</span> <span class="str">`넓이: ${this.area()}`</span>;
}
}
<span class="kw">class</span> <span class="cls">Circle</span> <span class="kw">extends</span> <span class="cls">Shape</span> {
<span class="fn">area</span>() { <span class="kw">return</span> Math.PI * <span class="kw">this</span>.r ** <span class="num">2</span>; }
<span class="fn">perimeter</span>() { <span class="kw">return</span> <span class="num">2</span> * Math.PI * <span class="kw">this</span>.r; }
}
</div>
<div class="info-text" style="margin-top:10px">
사용자는 area()가 어떻게 계산되는지 알 필요 없습니다. 인터페이스만 알면 됩니다.
</div>
</div>
</div>
</div>
</div>
</div>
</section>
<div class="section-divider"></div>
<!-- ══════════════════════════════════════════
SECTION 2: SOLID
═══════════════════════════════════════════ -->
<section id="solid">
<div class="section-header">
<div class="tag tag-ch11">02 — SOLID PRINCIPLES</div>
<h2>SOLID 원칙</h2>
<p>로버트 마틴이 정립한 객체지향 설계의 5가지 핵심 원칙입니다. 유지보수하기 쉽고 확장 가능한 소프트웨어 구조를 만드는 가이드라인입니다. <span style="color:#f59e0b">카드를 클릭</span>하면 나쁜 예 / 좋은 예를 비교합니다.</p>
</div>
<div class="viz-box">
<div class="solid-grid">
<!-- S -->
<div class="solid-card" id="solid-S" onclick="flipSolid('S')" style="min-height:320px">
<div class="solid-card-front">
<div class="solid-letter">S</div>
<div class="solid-name">단일 책임 원칙</div>
<div class="solid-sub">Single Responsibility Principle</div>
<div class="solid-desc">하나의 클래스는 하나의 책임만 가져야 합니다. 클래스를 변경하는 이유는 오직 하나여야 합니다.</div>
<div class="solid-flip-hint">↻ 클릭해서 예시 보기</div>
</div>
<div class="solid-card-back">
<span class="solid-back-label solid-bad">❌ 나쁜 예</span>
<div class="solid-code">
<span class="kw">class</span> <span class="cls">UserManager</span> {
<span class="fn">saveUser</span>(user) { <span class="cmt">/* DB 저장 */</span> }
<span class="fn">sendEmail</span>(user) { <span class="cmt">/* 이메일 발송 */</span> }
<span class="fn">generateReport</span>() { <span class="cmt">/* 보고서 생성 */</span> }
<span class="cmt">// 책임이 3개! → 변경 이유가 3개</span>
}
</div>
<span class="solid-back-label solid-good" style="margin-top:10px">✅ 좋은 예</span>
<div class="solid-code">
<span class="kw">class</span> <span class="cls">UserRepository</span> {
<span class="fn">save</span>(user) { <span class="cmt">/* DB 저장만 */</span> }
}
<span class="kw">class</span> <span class="cls">EmailService</span> {
<span class="fn">send</span>(user) { <span class="cmt">/* 이메일만 */</span> }
}
<span class="kw">class</span> <span class="cls">ReportGenerator</span> {
<span class="fn">generate</span>() { <span class="cmt">/* 보고서만 */</span> }
}
</div>
</div>
</div>
<!-- O -->
<div class="solid-card" id="solid-O" onclick="flipSolid('O')" style="min-height:320px">
<div class="solid-card-front">
<div class="solid-letter">O</div>
<div class="solid-name">개방-폐쇄 원칙</div>
<div class="solid-sub">Open/Closed Principle</div>
<div class="solid-desc">소프트웨어 요소는 확장에는 열려 있고, 수정에는 닫혀 있어야 합니다. 기존 코드를 변경하지 않고 기능을 추가해야 합니다.</div>
<div class="solid-flip-hint">↻ 클릭해서 예시 보기</div>
</div>
<div class="solid-card-back">
<span class="solid-back-label solid-bad">❌ 나쁜 예</span>
<div class="solid-code">
<span class="kw">function</span> <span class="fn">getArea</span>(shape) {
<span class="kw">if</span> (shape.type === <span class="str">'circle'</span>) {
<span class="kw">return</span> Math.PI * shape.r ** <span class="num">2</span>;
} <span class="kw">else if</span> (shape.type === <span class="str">'rect'</span>) {
<span class="kw">return</span> shape.w * shape.h;
}
<span class="cmt">// 새 도형 추가 → 함수 수정 필요!</span>
}
</div>
<span class="solid-back-label solid-good" style="margin-top:10px">✅ 좋은 예</span>
<div class="solid-code">
<span class="kw">class</span> <span class="cls">Circle</span> { <span class="fn">area</span>() { <span class="kw">return</span> Math.PI*<span class="kw">this</span>.r**<span class="num">2</span>; } }
<span class="kw">class</span> <span class="cls">Rect</span> { <span class="fn">area</span>() { <span class="kw">return this</span>.w*<span class="kw">this</span>.h; } }
<span class="cmt">// 새 도형 → 클래스만 추가, 기존 코드 불변</span>
<span class="kw">class</span> <span class="cls">Triangle</span> { <span class="fn">area</span>() { <span class="kw">return</span> ...; } }
</div>
</div>
</div>
<!-- L -->
<div class="solid-card" id="solid-L" onclick="flipSolid('L')" style="min-height:320px">
<div class="solid-card-front">
<div class="solid-letter">L</div>
<div class="solid-name">리스코프 치환 원칙</div>
<div class="solid-sub">Liskov Substitution Principle</div>
<div class="solid-desc">하위 타입은 언제나 상위 타입을 대체할 수 있어야 합니다. 자식 클래스는 부모 클래스 계약을 위반하면 안 됩니다.</div>
<div class="solid-flip-hint">↻ 클릭해서 예시 보기</div>
</div>
<div class="solid-card-back">
<span class="solid-back-label solid-bad">❌ 나쁜 예</span>
<div class="solid-code">
<span class="kw">class</span> <span class="cls">Bird</span> { <span class="fn">fly</span>() { <span class="kw">return</span> <span class="str">'날아!'</span>; } }
<span class="kw">class</span> <span class="cls">Penguin</span> <span class="kw">extends</span> <span class="cls">Bird</span> {
<span class="fn">fly</span>() {
<span class="kw">throw new</span> Error(<span class="str">'펭귄은 못 날아!'</span>);
<span class="cmt">// LSP 위반! Bird 대체 불가</span>
}
}
</div>
<span class="solid-back-label solid-good" style="margin-top:10px">✅ 좋은 예</span>
<div class="solid-code">
<span class="kw">class</span> <span class="cls">Bird</span> { <span class="fn">move</span>() { ... } }
<span class="kw">class</span> <span class="cls">FlyBird</span> <span class="kw">extends</span> <span class="cls">Bird</span> { <span class="fn">fly</span>() { ... } }
<span class="kw">class</span> <span class="cls">SwimBird</span><span class="kw"> extends</span> <span class="cls">Bird</span> { <span class="fn">swim</span>() { ... } }
<span class="cmt">// Penguin extends SwimBird → 계약 준수</span>
</div>
</div>
</div>
<!-- I -->
<div class="solid-card" id="solid-I" onclick="flipSolid('I')" style="min-height:320px">
<div class="solid-card-front">
<div class="solid-letter">I</div>
<div class="solid-name">인터페이스 분리 원칙</div>
<div class="solid-sub">Interface Segregation Principle</div>