Is it possible to call a static method from another static method within the same class?
- No, it leads to a syntax error.
- Yes, using the class name.
- No, static methods cannot call each other.
- Yes, using the this keyword.
Yes, it is possible to call a static method from another static method within the same class using the class name. Static methods are associated with the class and can be called using the class name to avoid confusion. Option B is correct.
Which statement correctly initiates a dynamic import in ES6?
- import module from 'module'
- require('module')
- import('module')
- require.ensure(['module'], callback)
The correct syntax for initiating a dynamic import in ES6 is import('module'). This allows you to asynchronously load and work with modules at runtime, enhancing flexibility in the application structure.
Tree shaking can fail to eliminate unused code if modules are dynamically _______ at runtime.
- Imported
- Exported
- Loaded
- Unloaded
The correct option is (c) Loaded. Tree shaking may fail if modules are dynamically loaded at runtime. Dynamically loading modules introduces uncertainty about which modules will be used, making it challenging for the module bundler to perform effective tree shaking.
Static properties are useful for storing data that __________ across all instances of the class.
- varies
- fluctuates
- persists
- changes
Static properties in a class are shared among all instances, ensuring that the data remains consistent across different objects created from the same class. This is particularly useful for information that should be common to all instances.
In which scenarios are dynamic imports particularly useful?
- Small Applications
- Large Applications with Code Splitting Needs
- Static Applications
- Mobile Applications Only
Dynamic imports are particularly useful in large applications where code splitting is necessary. This allows loading only the required modules on-demand, reducing the initial load time and improving overall application performance. Small and static applications may not benefit as much from dynamic imports.
When a function returns a new object each time it is called, even with the same inputs, is it considered a pure function?
- Yes
- No
- Depends on the type of object
- Only if the object is immutable
A pure function should consistently return the same result for the same inputs, and creating new objects introduces unpredictability, making it impure.
To rename a named export during import, use the syntax import { originalName as ______ } from 'module-name';.
- newName
- importedName
- aliasName
- renamedName
When importing a named export and giving it a new name, use the as keyword, making option c) aliasName the correct choice. The syntax is import { originalName as aliasName } from 'module-name';.
Can JavaScript handle asynchronous tasks natively, and if so, how is this achieved in relation to the event loop?
- Yes, using callbacks.
- Yes, through asynchronous functions and promises.
- No, JavaScript cannot handle asynchronous tasks natively.
- Yes, through synchronous functions.
JavaScript can handle asynchronous tasks through asynchronous functions and promises. The event loop ensures that asynchronous code is executed at the appropriate time.
Consider a scenario where you have a base class for a UI component and multiple derived classes for specific components. How would the constructors and super keyword play a role in initializing state and props?
- Constructors are unnecessary; use default values for state and props.
- Use constructors for state and props initialization without involving the super keyword.
- Employ both constructors and the super keyword to initialize state and props in a structured manner.
- Rely on setter methods to initialize state and props in UI components.
In a scenario with a base UI component class and derived classes, constructors play a crucial role. Utilizing both constructors and the super keyword ensures a systematic approach to initializing state and props, fostering a clear and organized class hierarchy for UI components.
When implementing code splitting using dynamic imports, large bundles are broken into smaller __________.
- Components
- Chunks
- Fragments
- Segments
Code splitting is the technique of breaking large bundles into smaller chunks, and in ES6, this is achieved through dynamic imports, creating separate chunks. Code chunks are often referred to as "chunks" in this context.