To dynamically import a module based on a variable, the variable's value is included inside the __________.
- Template Literal
- Parentheses
- Square Brackets
- Curly Braces
To dynamically import a module based on a variable, the variable's value is included inside the square brackets of the import statement. This feature is known as dynamic import expressions, allowing developers to specify the module path at runtime. By using square brackets, the JavaScript interpreter treats the import statement as a dynamic expression, enabling more flexibility in module loading. Understanding this syntax is essential for dynamically loading modules based on runtime conditions, enhancing the adaptability of the application.
Can you use const within a for...of loop to declare a variable for each iteration?
- Yes
- No
- It depends
- Not applicable
In a for...of loop, the variable declared using const cannot be reassigned in each iteration. The loop variable retains its value throughout the loop, making it unsuitable for situations where reassignment is needed for each iteration.
In a subclass constructor, the super keyword must be called before accessing _______.
- parent properties
- child properties
- subclass properties
- constructor properties
In a subclass constructor, the super keyword must be called before accessing parent properties. This is because the super keyword refers to the parent class, and it needs to be invoked first to ensure that the parent's properties are properly initialized before accessing them in the subclass.
Imagine designing a class hierarchy for vehicles. How would you use constructors and the super keyword when creating a class for a specific type of vehicle, like a truck?
- Utilize the constructor to initialize specific properties and use super to call the parent class constructor.
- Ignore constructors and super, relying on default values for properties.
- Use only the super keyword without constructors for simplicity.
- Use constructors but avoid the super keyword for vehicle class creation.
In designing a class hierarchy, the constructor is crucial to initialize specific properties of the truck class. The super keyword ensures that the parent class constructor is called, setting up common attributes shared among all vehicles. This promotes code reusability and a clear inheritance structure.
In object destructuring, the rest operator can be used to gather the remaining properties into a new '__________'.
- Object
- Array
- Variable
- Function
In object destructuring, the rest operator (...) is used to collect the remaining properties of an object into a new array. This allows you to extract specific properties while capturing the rest in a convenient variable, often referred to as an array or an object.
When designing a library for UI components, how would the use of ES6 classes and inheritance improve the code structure and reusability?
- Prototype Chain
- Object Literal Notation
- Composition over Inheritance
- Extending Base Components
By using ES6 classes and inheritance, you can create a hierarchy of UI components, making it easier to manage shared functionality and customize specific components. Options A and B are not directly related to ES6 classes, and Option C emphasizes composition as a preferred pattern.
In what scenario would a callback be more appropriate than a Promise?
- When dealing with simple and sequential asynchronous tasks.
- Callbacks are never more appropriate than Promises.
- In complex situations where multiple asynchronous tasks depend on each other.
- Promises are always preferred over callbacks.
Callbacks are suitable for straightforward, sequential tasks where the asynchronous nature is not overly complex. Promises shine in scenarios involving more complex asynchronous workflows, providing better control and readability. Understanding the use cases for callbacks versus Promises is essential for choosing the right approach in different asynchronous programming scenarios.
In ES6, a function parameter's default value can be another function's _________.
- name
- return value
- parameters
- scope
In ES6, a function parameter's default value can be another function's return value. This allows for dynamic default values based on the execution of the provided function.
When using a for...of loop, what keyword is used to access the current item in the collection?
- for
- in
- of
- each
The for...of loop uses the "of" keyword to iterate over the values of an iterable object, providing a cleaner syntax compared to the for...in loop.
Using rest parameters alongside default parameters can result in more concise and flexible function definitions.
- Spread Operators
- Arrow Functions
- Template Literals
- Destructuring Assignment
In JavaScript, rest parameters (...) allow a function to accept an indefinite number of arguments as an array. Combining rest parameters with default parameters enables the creation of more versatile and compact functions. The spread operator, which is the correct option, is used to collect function arguments as an array.