The WeakSet does not have a _______ method which is available in a regular Set.
- size
- delete
- clear
- add
The WeakSet does not have a 'clear' method, which is available in a regular Set. The 'clear' method in a Set is used to remove all elements from the Set, but WeakSet lacks this functionality.
Can you use both named and default exports in the same ES6 module?
- Yes
- No
- Only if the module is in strict mode
- Only if the named exports are functions
Yes, you can use both named and default exports in the same ES6 module. This allows you to export a single "default" value along with multiple named exports from the same module.
Can an arrow function have its own this context?
- Yes, it has its own this context
- No, it shares the this context with the surrounding code
- Yes, but it inherits the this context from the parent scope
- No, it always refers to the global object
Yes, an arrow function has its own this context, which means it does not bind its own this but retains the this value of the enclosing lexical scope. This behavior can be advantageous in certain scenarios.
Template literals are enclosed by ________ characters.
- Single backtick (`)
- Double quotes (")
- Single quotes (')
- Dollar sign ($)
Template literals in ES6 are enclosed by backticks (`). This allows for easy embedding of variables and expressions using ${}.
In an AJAX call using Promises, _________ is a method used to parse the JSON response.
- .parseJSON()
- .toJSON()
- .parse()
- .json()
The correct method for parsing the JSON response in a Promises-based AJAX call is .json(). This method is specifically designed to extract and parse the JSON data from the response.
Question 2: In a large-scale application, how does the use of absolute imports in ES6 modules affect maintainability and refactoring compared to relative imports?
- Easier refactoring, better maintainability
- No significant impact
- Harder refactoring, lower maintainability
- Depends on the project structure
Using absolute imports can make refactoring more challenging, as changes to the file structure may require updating import paths throughout the codebase. This can result in lower maintainability compared to relative imports, which automatically adjust to the file's position. Consider the trade-offs based on project size and structure.
In ES6, setting "type": "______" in package.json informs Node.js to treat JavaScript files as ES modules.
- "ES6"
- "module"
- "script"
- "import"
By setting "type": "module" in package.json, Node.js is informed to treat JavaScript files as ES modules, allowing the use of import/export syntax and adhering to ES6 module behavior.
How does the syntax of an arrow function differ from a traditional function in JavaScript?
- Uses a shorter syntax (=>)
- Uses the function keyword
- Uses a different declaration keyword
- No difference in syntax
Arrow functions in ES6 use a shorter syntax (=>) compared to the traditional function declaration. This concise syntax is especially useful for simple one-liner functions.
To inherit properties and methods from another class in ES6, use the ________ keyword.
- Inherits
- Extends
- InheritsFrom
- ExtendsFrom
In ES6, the extends keyword is used to inherit properties and methods from another class.
What is the impact of dynamic imports on code splitting in a JavaScript application?
- Increases modularity
- Decreases modularity
- Has no impact
- Only works in Node.js
Dynamic imports in JavaScript have a positive impact on code splitting by allowing modules to be loaded on-demand. This enhances modularity, as only the necessary code is fetched when needed, reducing the initial load time of the application.