Alternatives to If (Unless, Provided That, As Long As, In Case) — Bài Tập 5

You are refactoring a system where a complex `if-else if` structure is used to determine the behavior of an object based on its components (e.g., a `Graphic` object can be a `Circle`, `Square`, or a `Group` of graphics). Which design pattern would allow you to treat individual objects and compositions of objects uniformly, thus avoiding conditional logic for handling different types?

You are building a system that needs to map UI component names to their corresponding React/Vue/Angular components (e.g., 'Button' to `<ButtonComponent>`, 'Input' to `<InputComponent>`). Which data structure is most efficient for replacing a large `if-else if` or `switch` statement for dynamic component rendering?

When refactoring a series of `if-else if` statements that check for different types of objects and perform type-specific actions, which design principle or pattern is often a superior alternative?

Consider a scenario where you need to access a property of an object, but the object itself or an intermediate property might be null or undefined. Which operator provides a safe way to access nested properties without explicit null checks?

What is the value of `discount` in `const discount = (isPremium) ? 0.15 : 0.05;` if `isPremium` is `true`?

In many languages, what is the primary keyword used to define a block of code that executes based on the value of an expression in a switch statement?

A payment processing system needs to support various payment methods (e.g., Credit Card, PayPal, Bank Transfer). Each method has a distinct set of steps for authorization and capture. Which design pattern would best allow you to add new payment methods without modifying the core payment processing logic, replacing a large `if-else if` structure?

Which of the following is a valid way to use a `switch` statement with an `enum` type?

In a `switch` statement, if a `case` block does not have a `break` statement, what happens?

If `user.isAdmin` is false, what is the outcome of `user.isAdmin && showAdminPanel();`?