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} public void deposit(double amount) { if (amount <= 0) { throw new IllegalArgumentException("Deposit must be positive"); } balance += amount; } public void withdraw(double amount) { if (amount <= 0) { throw new IllegalArgumentException("Withdrawal must be positive"); } if (amount > balance) { throw new IllegalStateException("Insufficient funds"); } balance -= amount; } // ===== PRIVATE IMPLEMENTATION: How invariants are enforced ===== private void validateHolderName(String name) { if (name == null || name.trim().isEmpty()) { throw new IllegalArgumentException("Holder name required"); } } private void validateBalance(double amount) { if (amount < 0) { throw new IllegalArgumentException("Initial balance cannot be negative"); } } } // Client code is now FORCED to go through the interface: BankAccount account = new BankAccount("Alice", 1000.0); account.deposit(500.0); // ✓ Valid operation account.withdraw(200.0); // ✓ Valid operation account.withdraw(5000.0); // ✗ Throws exception - invariant protected!72:T752,# ✅ GOOD DESIGN: Private fields with controlled access from datetime import datetime from typing import Final class BankAccount: def __init__(self, holder_name: str, initial_balance: float): self._validate_holder_name(holder_name) self._validate_balance(initial_balance) self._balance: float = initial_balance self._holder_name: str = holder_name self._opened_date: Final[datetime] = datetime.now() # ===== PUBLIC INTERFACE: What clients can do ===== @property def balance(self) -> float: return self._balance @property def holder_name(self) -> str: return self._holder_name @property def opened_date(self) -> datetime: return self._opened_date # datetime is immutable in Python def deposit(self, amount: float) -> None: if amount <= 0: raise ValueError("Deposit must be positive") self._balance += amount def withdraw(self, amount: float) -> None: if amount <= 0: raise ValueError("Withdrawal must be positive") if amount > self._balance: raise ValueError("Insufficient funds") self._balance -= amount # ===== PRIVATE IMPLEMENTATION: How invariants are enforced ===== def _validate_holder_name(self, name: str) -> None: if not name or not name.strip(): raise ValueError("Holder name required") def _validate_balance(self, amount: float) -> None: if amount < 0: raise ValueError("Initial balance cannot be negative") # Client code is now FORCED to go through the interface: account = BankAccount("Alice", 1000.0) account.deposit(500.0) # ✓ Valid operation account.withdraw(200.0) # ✓ Valid operation account.withdraw(5000.0) # ✗ Raises exception - invariant protected!73:T788,// ✅ GOOD DESIGN: Private fields with controlled access class BankAccount { private _balance: number; private _holderName: string; private readonly _openedDate: Date; constructor(holderName: string, initialBalance: number) { this.validateHolderName(holderName); this.validateBalance(initialBalance); this._holderName = holderName; this._balance = initialBalance; this._openedDate = new Date(); } // ===== PUBLIC INTERFACE: What clients can do ===== get balance(): number { return this._balance; } get holderName(): string { return this._holderName; } get openedDate(): Date { return new Date(this._openedDate.getTime()); // Defensive copy! } deposit(amount: number): void { if (amount <= 0) { throw new Error("Deposit must be positive"); } this._balance += amount; } withdraw(amount: number): void { if (amount <= 0) { throw new Error("Withdrawal must be positive"); } if (amount > this._balance) { throw new Error("Insufficient funds"); } this._balance -= amount; } // ===== PRIVATE IMPLEMENTATION: How invariants are enforced ===== private validateHolderName(name: string): void { if (!name || !name.trim()) { throw new Error("Holder name required"); } } private validateBalance(amount: number): void { if (amount < 0) { throw new Error("Initial balance cannot be negative"); } } } // Client code is now FORCED to go through the interface: const account = new BankAccount("Alice", 1000.0); account.deposit(500.0); // ✓ Valid operation account.withdraw(200.0); // ✓ Valid operation account.withdraw(5000.0); // ✗ Throws error - invariant protected!74:T714,// ❌ ANEMIC: Getters and setters for everything defeats encapsulation public class Order { private List items; private BigDecimal total; private OrderStatus status; public List getItems() { return items; } public void setItems(List items) { this.items = items; } public BigDecimal getTotal() { return total; } public void setTotal(BigDecimal total) { this.total = total; } public OrderStatus getStatus() { return status; } public void setStatus(OrderStatus status) { this.status = status; } } // Client code must manage all the logic: order.getItems().add(newItem); order.setTotal(order.getTotal().add(newItem.getPrice())); if (order.getItems().size() > 10) { order.setStatus(OrderStatus.BULK); } // Business rules scattered everywhere, easily violated! // ✅ RICH: Behavior methods encapsulate business logic public class Order { private List items = new ArrayList<>(); private BigDecimal total = BigDecimal.ZERO; private OrderStatus status = OrderStatus.OPEN; public void addItem(OrderItem item) { items.add(item); total = total.add(item.getPrice()); updateStatusBasedOnItems(); } public void removeItem(OrderItem item) { if (items.remove(item)) { total = total.subtract(item.getPrice()); updateStatusBasedOnItems(); } } public BigDecimal getTotal() { return total; } // Read-only public OrderStatus getStatus() { return status; } // Read-only public List getItems() { return Collections.unmodifiableList(items); // Defensive! } private void updateStatusBasedOnItems() { status = items.size() > 10 ? 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Learn why this discipline is foundational to building robust, maintainable, and evolvable software systems.","difficulty":"BEGINNER","estimatedMinutes":60,"pages":[{"id":"seed_30c145b282cbfe632c307eafeee2b015","title":"Private Fields, Public Interface","order":0,"content":[{"id":"opening-hook","title":"The Invisible Barrier That Makes Software Work","content":[{"data":{"content":"Every well-designed software component shares a fundamental characteristic: **it hides more than it shows**. Like an iceberg where the visible tip represents only a fraction of its total mass, a well-designed class exposes a small, carefully crafted interface while concealing the vast complexity of its internal implementation.\n\nThis isn't accidental. It's the result of a deliberate design principle that has proven itself across decades of software engineering: **private fields, public interface**. This principle is the operational foundation of encapsulation—the first pillar of object-oriented design.\n\nUnderstanding this principle deeply will transform how you think about class design. You'll learn to see the boundary between public and private not as a mere syntax requirement, but as a fundamental architectural decision that determines whether your software can evolve gracefully or collapses under its own complexity."},"type":"text"},{"data":{"icon":"Target","title":"What You Will Master","content":"By the end of this page, you will understand why private fields are the default, how to design clean public interfaces, the relationship between visibility and coupling, and how this principle enables software that can change without breaking. These concepts form the bedrock of professional software design.","variant":"info"},"type":"callout"}]},{"id":"fundamental-principle","title":"The Fundamental Principle","content":[{"data":{"content":"The principle can be stated simply:\n\n> **Make all fields private. Expose only what clients genuinely need through carefully designed public methods.**\n\nThis sounds straightforward, yet it's consistently violated by developers at all experience levels. To truly understand why this principle matters, we need to examine what happens when it's followed—and what happens when it's ignored."},"type":"text"},{"data":{"left":[{"data":{"items":["**Implementation Freedom** — Change internal representation without affecting clients","**Invariant Protection** — Guarantee that internal state remains valid","**Reduced Coupling** — Clients depend only on behavior, not structure","**Controlled Evolution** — Add features without breaking existing code","**Simplified Reasoning** — Understand state changes through explicit methods"],"title":{"icon":"CheckCircle","text":"Private Fields Enable","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"right":[{"data":{"items":["**Implementation Lock-in** — Any change breaks client code","**Invariant Violations** — No way to enforce valid state","**Tight Coupling** — Clients depend on internal structure","**Fragile Evolution** — Every change risks cascading failures","**Scattered Logic** — Validation and rules spread everywhere"],"title":{"icon":"XCircle","text":"Public Fields Cause","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"accent"},"type":"list"}]},"type":"two-column"},{"data":{"content":"**The key insight:** The distinction between private and public isn't about secrecy—it's about **defining the contract between your class and the world**. Private members are your implementation details; public members are your promises.\n\nWhen you make something public, you're making a commitment. You're saying: \"This will continue to exist and work the same way. You can depend on it.\" When you make something private, you're reserving the right to change it. You're saying: \"This is how I've chosen to solve the problem today, but I may solve it differently tomorrow.\""},"type":"text"}],"titleType":"number","titleNumber":1},{"id":"anatomy-well-designed-class","title":"Anatomy of a Well-Designed Class","content":[{"data":{"content":"Let's examine what a properly encapsulated class looks like by contrasting two approaches to the same problem: representing a bank account with balance constraints.\n\n**The Problem:** Design a class representing a bank account that:\n- Has a balance that cannot go negative\n- Tracks the account holder's name\n- Records when the account was opened"},"type":"text"},{"data":{"fileName":"BankAccount — Poor Design (Public Fields)","languages":[{"code":"// ❌ POOR DESIGN: Public fields expose implementation details\npublic class BankAccount {\n public double balance; // Anyone can modify!\n public String holderName; // Anyone can change!\n public Date openedDate; // Anyone can alter history!\n \n public BankAccount(String holderName, double initialBalance) {\n this.holderName = holderName;\n this.balance = initialBalance;\n this.openedDate = new Date();\n }\n}\n\n// Client code (anywhere in the system):\nBankAccount account = new BankAccount(\"Alice\", 1000.0);\naccount.balance = -500.0; // Negative balance! No protection.\naccount.holderName = \"\"; // Empty name! No validation.\naccount.openedDate = new Date(0); // Altered history! No integrity.\n\n// The class cannot protect its own invariants.\n// Business rules must be enforced everywhere this class is used.","label":"Java","value":"java"},{"code":"# ❌ POOR DESIGN: Public attributes expose implementation details\nclass BankAccount:\n def __init__(self, holder_name: str, initial_balance: float):\n self.balance = initial_balance # Anyone can modify!\n self.holder_name = holder_name # Anyone can change!\n self.opened_date = datetime.now() # Anyone can alter history!\n\n# Client code (anywhere in the system):\naccount = BankAccount(\"Alice\", 1000.0)\naccount.balance = -500.0 # Negative balance! No protection.\naccount.holder_name = \"\" # Empty name! No validation.\naccount.opened_date = None # Altered history! No integrity.\n\n# The class cannot protect its own invariants.\n# Business rules must be enforced everywhere this class is used.","label":"Python","value":"python"},{"code":"// ❌ POOR DESIGN: Public fields expose implementation details\nclass BankAccount {\n balance: number; // Anyone can modify!\n holderName: string; // Anyone can change!\n openedDate: Date; // Anyone can alter history!\n \n constructor(holderName: string, initialBalance: number) {\n this.holderName = holderName;\n this.balance = initialBalance;\n this.openedDate = new Date();\n }\n}\n\n// Client code (anywhere in the system):\nconst account = new BankAccount(\"Alice\", 1000.0);\naccount.balance = -500.0; // Negative balance! No protection.\naccount.holderName = \"\"; // Empty name! No validation.\naccount.openedDate = new Date(0); // Altered history! No integrity.\n\n// The class cannot protect its own invariants.\n// Business rules must be enforced everywhere this class is used.","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"content":"Now contrast this with a properly encapsulated design:"},"type":"text"},{"data":{"fileName":"BankAccount — Good Design (Private Fields)","languages":[{"code":"$71","label":"Java","value":"java"},{"code":"$72","label":"Python","value":"python"},{"code":"$73","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"icon":"Lightbulb","title":"The Critical Difference","content":"In the well-designed version, it's **impossible** to create an invalid BankAccount or put it into an invalid state through normal operations. The class is **self-protecting**. Clients don't need to remember to validate; the class enforces its own rules. This is the essence of encapsulation.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":2},{"id":"public-interface-contract","title":"The Public Interface as Contract","content":[{"data":{"content":"When you expose something publicly—whether a method, property, or constant—you're entering into a **contract** with every piece of code that will ever use your class. This contract has profound implications:\n\n**The Contract Promises:**\n\n1. **Existence** — The public member will continue to exist in future versions\n2. **Signature Stability** — The parameters and return type won't change incompatibly\n3. **Behavioral Consistency** — The method will continue to do what it currently does\n4. **Semantic Integrity** — The meaning of the member won't fundamentally change\n\nBreaking any of these promises breaks client code. In a large system, a single broken promise can cascade into hundreds of compilation errors or—far worse—silent behavioral changes that take weeks to diagnose."},"type":"text"},{"data":{"rows":[["Change Freedom","Nearly frozen—changes break clients","Complete freedom to refactor"],["Documentation Burden","Must be documented for external use","Internal comments sufficient"],["Testing Requirements","Must test for backward compatibility","Test for correctness only"],["Version Coupling","Clients lock to your version","Clients unaffected by changes"],["Design Pressure","Must be near-perfect upfront","Can iterate and improve freely"]],"caption":"Contract Implications of Public vs Private","headers":["Aspect","Public Member","Private Member"]},"type":"table"},{"data":{"content":"**The asymmetry is stark:** Making something private gives you complete freedom; making something public chains you to that decision forever.\n\nThis is why the advice is always **\"start private, go public only when necessary.\"** It's vastly easier to make a private member public later (if clients genuinely need it) than to make a public member private (which breaks all existing clients).\n\n**The Minimum Interface Principle:**\n\n> *Expose the smallest public interface that enables clients to accomplish their goals. Every additional public member is additional maintenance burden and additional constraint on your future evolution.*\n\nAsk yourself for each potential public member: \"Does the client *need* this, or is it just *convenient*?\" Convenience is not sufficient justification for public exposure."},"type":"text"},{"data":{"icon":"AlertCircle","title":"The Ratchet Effect","content":"Once something is public and clients depend on it, it's almost impossible to remove. Every public API decision is effectively permanent. This is why library and framework designers obsess over their public interfaces—they know they'll be living with those decisions for decades.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":3},{"id":"designing-public-interface","title":"Designing the Public Interface","content":[{"data":{"content":"A well-designed public interface has specific characteristics that distinguish it from a collection of exposed fields. Understanding these characteristics helps you craft interfaces that serve clients well while preserving your implementation freedom."},"type":"text"},{"data":{"items":["**Behavior-Centric** — Express what clients can *do*, not what data you hold. `account.deposit(amount)` rather than `account.balance += amount`.","**Self-Documenting** — Method names clearly communicate purpose and intent. A reader shouldn't need to inspect implementation to understand usage.","**Minimal** — Include only what clients genuinely need. Resist the urge to expose 'just in case' features.","**Consistent** — Follow naming conventions and patterns uniformly. If one method is `getUserById()`, don't have another called `fetchOrderForId()`.","**Complete** — Enable all legitimate use cases without requiring workarounds. If clients can't accomplish their goals, they'll resort to hacks.","**Orthogonal** — Each method does one thing. Avoid overlapping functionality that can be composed from other public methods."],"title":{"icon":"Target","text":"Characteristics of Excellent Public Interfaces","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**The Abstraction Level Rule:**\n\nYour public interface should operate at a **higher abstraction level** than your private implementation. This is what allows the interface to remain stable while the implementation evolves.\n\nConsider the difference:"},"type":"text"},{"data":{"rows":[["`setBalanceField(double value)`","`deposit(double amount)`"],["`getInternalHashMap()`","`findUserById(String id)`"],["`sqlQuery(String query)`","`findActiveOrders()`"],["`setDatabaseConnection(Connection c)`","`connect(String url)`"],["`getArrayList()`","`getItems()` returning List interface"]],"caption":"Abstraction Levels in Interface Design","headers":["Low Abstraction (Poor)","High Abstraction (Good)"]},"type":"table"},{"data":{"content":"The low-abstraction versions expose implementation details: field names, internal data structures, database specifics. Changing any of these requires changing the interface.\n\nThe high-abstraction versions describe **intent**: what the client wants to accomplish. The implementation can change freely—use a different data structure, switch databases, refactor the internal representation—without affecting the interface."},"type":"text"},{"data":{"icon":"Lightbulb","title":"The Shopping Cart Test","content":"When designing a public method, imagine you're an engineer at a different company who's never seen your code. Read only the method signature and documentation. Can you understand exactly what the method does and how to use it? If you need to see the implementation to understand the interface, the abstraction level is too low.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":4},{"id":"common-antipatterns","title":"Common Anti-Patterns in Field Visibility","content":[{"data":{"content":"Even experienced developers fall into visibility anti-patterns. Recognizing these patterns in your own code—and understanding why they're problematic—is essential to applying the private fields principle correctly."},"type":"text"},{"data":{"items":["**What it is:** Classes with all private fields but trivial getters and setters for everything, effectively making them public","**Why it happens:** Developers mechanically follow 'use getters/setters' without understanding why","**The problem:** No real encapsulation—business logic scatters across the codebase","**The fix:** Remove setters; add behavior methods. `order.addItem(item)` instead of `order.setItems(list)`"],"title":{"icon":"XCircle","text":"Anti-Pattern 1: The Anemic Domain Model","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"fileName":"Anemic Domain Model Anti-Pattern","languages":[{"code":"$74","label":"Java","value":"java"}]},"type":"code"},{"data":{"items":["**What it is:** Returning mutable references to internal collections","**Why it happens:** Seems harmless—'I'm just giving them a list'","**The problem:** Clients can modify internals, bypassing all your careful checks","**The fix:** Return unmodifiable views or defensive copies"],"title":{"icon":"XCircle","text":"Anti-Pattern 2: Leaking Internal Collections","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"items":["**What it is:** Using package-private (default) visibility for fields out of laziness or habit","**Why it happens:** Private feels 'restrictive'; package-private feels like a compromise","**The problem:** Any class in the package can modify your internals—thousands of potential access points","**The fix:** Always be explicit. Private is the default for fields; public is for interface methods"],"title":{"icon":"XCircle","text":"Anti-Pattern 3: Package-Private by Default","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"icon":"Info","title":"The Test of True Encapsulation","content":"Ask yourself: 'If I completely changed how this class stores its data—different data types, different structure—would the public interface remain identical?' If yes, you've achieved encapsulation. If no, implementation details have leaked into your interface.","variant":"note"},"type":"callout"}],"titleType":"number","titleNumber":5},{"id":"coupling-connection","title":"The Coupling Connection","content":[{"data":{"content":"Private fields and public interfaces aren't just about protecting invariants—they're fundamentally about **managing coupling**.\n\n**Coupling** measures how much one module depends on another. High coupling means changes ripple widely; low coupling means changes are contained. The goal of good software design is *low coupling* between modules—achieved precisely through private fields and clean interfaces."},"type":"text"},{"data":{"content":"**The Coupling Spectrum:**\n\nWhen client code depends on your class, the *nature* of that dependency determines how tightly coupled they are:\n\n1. **Content Coupling (Worst)** — Client directly modifies your internal fields or implementation\n2. **Structural Coupling** — Client knows your internal data structure\n3. **Data Coupling** — Client knows the types you use internally\n4. **Behavioral Coupling (Best)** — Client only knows what behaviors you offer\n\nPrivate fields with behavioral public interfaces push you toward behavioral coupling—the loosest, most maintainable form."},"type":"text"},{"data":{"fileName":"Coupling Comparison","languages":[{"code":"$75","label":"Java","value":"java"}]},"type":"code"},{"data":{"content":"**The Dependency Direction Rule:**\n\nCoupling flows in the direction of visibility. When class A has public members, all clients become coupled to those members. Reducing public surface area reduces the potential for coupling.\n\nThis is why minimizing public interfaces isn't just aesthetic preference—it's engineering discipline. **Every public member is a potential coupling point.** The more coupling points, the more fragile your system becomes."},"type":"text"},{"data":{"icon":"Lightbulb","title":"The Ripple Effect","content":"In a system with 100 classes, a single public field that 50 classes depend on means any change to that field potentially affects 50 locations. With private fields and behavior methods, changes to internal representation affect only one location: the class itself.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":6},{"id":"implementation-freedom","title":"Implementation Freedom in Practice","content":[{"data":{"content":"The ultimate benefit of private fields is **implementation freedom**—the ability to change how your class works internally without affecting any external code. This isn't theoretical; it's a practical capability that you'll exercise constantly throughout your career."},"type":"text"},{"data":{"content":"**Real-World Scenario:**\n\nImagine you've built a `ShoppingCart` class with private fields. Over time, requirements evolve:"},"type":"text"},{"data":{"rows":[["V1","Simple `ArrayList` in memory","Unchanged: `addItem()`, `removeItem()`, `getTotal()`"],["V2","Add HashMap for O(1) item lookup","Unchanged"],["V3","Persist to database for abandonment recovery","Unchanged"],["V4","Add Redis cache for performance","Unchanged"],["V5","Event sourcing for audit trail","Unchanged"],["V6","Sharded storage for scale","Unchanged"]],"caption":"Evolution of a Well-Encapsulated Class","headers":["Version","Internal Change","Public Interface"]},"type":"table"},{"data":{"content":"**Six major architectural changes. Zero client code modifications.**\n\nEvery client using `cart.addItem(product, quantity)` continues to work identically through all these evolutions. They don't know—and don't need to know—that their cart is now distributed across three Redis shards behind a database with event sourcing.\n\nThis is the power of encapsulation. It's not about hiding things to be secretive; it's about **reserving the right to evolve**.\n\n**The Alternative:**\n\nIf the `items` field had been public, V2 would have broken all clients using the ArrayList API. V3 would have broken everyone. By V6, you'd have rewritten the entire system—or, more likely, you'd have caved and kept the legacy ArrayList forever, unable to scale."},"type":"text"},{"data":{"icon":"CheckCircle","title":"The Freedom to Improve","content":"Private fields give you the freedom to improve your implementation based on real-world feedback. You can profile, identify bottlenecks, optimize, refactor—all without coordinating releases with every client. This is how teams maintain velocity over years instead of grinding to a halt.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":7},{"id":"summary","title":"Summary: Private Fields, Public Interface","content":[{"data":{"content":"We've covered the foundational principle of data hiding—private fields with public interfaces. Let's consolidate the essential takeaways:"},"type":"text"},{"data":{"type":"ordered","items":["**Private is the default** — Make all fields private unless there's a compelling reason otherwise","**Public interface is a contract** — Every public member is a commitment you'll maintain forever","**Design behavior, not data access** — Public methods should express what clients can *do*, not what data you hold","**Abstraction protects evolution** — High-abstraction interfaces remain stable through implementation changes","**Coupling follows visibility** — More public members means more coupling means more fragility","**Implementation freedom is the goal** — Private fields let you change *how* without changing *what*"],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**What's Next:**\n\nNow that we understand the principle of private fields and public interfaces, we'll explore how to *control access to state*—the practical mechanics of how clients read and modify object state through well-designed accessor patterns. You'll learn when getters and setters are appropriate, when they violate encapsulation, and how to design access mechanisms that protect your invariants while serving client needs."},"type":"text"},{"data":{"icon":"CheckCircle","title":"Page Complete","content":"You now understand the foundational principle of data hiding: private fields with public interfaces. This principle isn't merely syntactic—it's the mechanism by which well-designed classes protect their invariants, minimize coupling, and preserve the freedom to evolve. Apply this principle consistently, and your code will be dramatically more maintainable.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":8}],"isLocked":false},{"id":"seed_b514f679ec7f70f22a7c06723d310ee3","title":"Controlling Access to State","order":1,"content":null,"isLocked":true},{"id":"seed_3280717d50694844da4a17bec59fc040","title":"Preventing Invalid State","order":2,"content":null,"isLocked":true},{"id":"seed_8911e2a2b71f2c3b62c5160ac53714ea","title":"Encapsulation as Protection","order":3,"content":null,"isLocked":true}]}},"dataUpdateCount":1,"dataUpdatedAt":1792196579066,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getModule"],{"input":{"slug":"data-hiding-principles"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getModule\"],{\"input\":{\"slug\":\"data-hiding-principles\"},\"type\":\"query\"}]"},{"dehydratedAt":1792196579102,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792196579067,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getProgress"],{"input":{"moduleId":"seed_8a0cf2ca25c25d67d13218c206c9e3f5"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getProgress\"],{\"input\":{\"moduleId\":\"seed_8a0cf2ca25c25d67d13218c206c9e3f5\"},\"type\":\"query\"}]"},{"dehydratedAt":1792196579102,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792196579067,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","get"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8911e2a2b71f2c3b62c5160ac53714ea"},"type":"query"}],"queryHash":"[[\"feedback\",\"get\"],{\"input\":{\"contentId\":\"seed_8911e2a2b71f2c3b62c5160ac53714ea\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792196579102,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792196579067,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","getUserLike"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8911e2a2b71f2c3b62c5160ac53714ea"},"type":"query"}],"queryHash":"[[\"feedback\",\"getUserLike\"],{\"input\":{\"contentId\":\"seed_8911e2a2b71f2c3b62c5160ac53714ea\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792196579102,"state":{"data":{"json":[]},"dataUpdateCount":1,"dataUpdatedAt":1792196579067,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["highlights","getHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8911e2a2b71f2c3b62c5160ac53714ea"},"type":"query"}],"queryHash":"[[\"highlights\",\"getHighlights\"],{\"input\":{\"contentId\":\"seed_8911e2a2b71f2c3b62c5160ac53714ea\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792196579102,"state":{"data":"$undefined","dataUpdateCount":0,"dataUpdatedAt":0,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"pending","fetchStatus":"fetching"},"queryKey":[["highlights","getPopularHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8911e2a2b71f2c3b62c5160ac53714ea","minCount":2},"type":"query"}],"queryHash":"[[\"highlights\",\"getPopularHighlights\"],{\"input\":{\"contentId\":\"seed_8911e2a2b71f2c3b62c5160ac53714ea\",\"contentType\":\"LEARNING_PAGE\",\"minCount\":2},\"type\":\"query\"}]","promise":"$@76"}]},"children":"$L77"}]