In a scenario where dynamic property names are based on user input, how would ES6 object literals be utilized?
- Utilize computed property names to dynamically assign properties
- Utilize the Object.assign method for dynamic property assignment
- Use Object.create for dynamic property generation
- Implement a switch statement for dynamic property naming
ES6 object literals allow the use of computed property names, which is particularly beneficial in scenarios where dynamic property names are based on user input. Computed property names enable the creation of object properties dynamically based on expressions, providing flexibility and conciseness in handling user input.
Using await inside a __________ loop can cause asynchronous operations to run sequentially.
- for
- while
- do-while
- foreach
When using await inside a loop, such as a while loop, it may lead to unexpected behavior. This is because the loop will not pause for each asynchronous operation to complete before moving to the next iteration, potentially causing them to run sequentially. It's crucial to understand the implications of using await inside loops and consider alternative approaches for parallel execution of asynchronous operations.
To use destructuring in a for...of loop iterating over a Map, you would write for (const [key, ______] of map).
- item
- val
- value
- element
To use destructuring in a for...of loop iterating over a Map, you would write for (const [key, value] of map). The value here is the second element of the destructuring assignment, representing the value associated with the current key in the Map.
Each call to the next() method on a generator returns an object with two properties: value and _________.
- result
- done
- output
- complete
The next() method on a generator returns an object with two properties: value (the yielded value) and done (a boolean indicating whether the generator has completed). The other options do not represent the properties returned by the next() method.
Can the spread operator be used to combine two arrays into one in ES6?
- Yes
- No
- Only if the arrays are of the same length
- Only if the arrays are of different types
Yes, the spread operator can be used to combine two arrays into one by spreading the elements of both arrays into a new array. It's a concise way of merging arrays without modifying the original arrays.
In a Promise-based AJAX call, ________ is used to asynchronously await the response without blocking the execution.
- await
- then
- catch
- async
In a Promise-based AJAX call, the await keyword is used to asynchronously await the response without blocking the execution. This allows the code to continue its execution while waiting for the AJAX response.
Q2: Given a scenario where a subclass needs to modify a method inherited from a parent class, how would you implement this in ES6?
- Use the 'extends' keyword
- Utilize the 'super' keyword
- Override the method in the subclass
- Employ the 'Object.create()' method
In ES6, you can implement method overriding by defining the method with the same name in the subclass. This allows the subclass to provide a specialized implementation while still inheriting from the parent class.
How do you import a default export from a module?
- Use the import keyword followed by any name of your choice, as the default export has no specific name.
- Use the import default statement followed by the name specified in the exporting module.
- Use the import { default } from 'module'; syntax.
- Use the import * as alias from 'module'; syntax.
To import a default export from an ES6 module, you use the import keyword followed by any name of your choice, as the default export does not have a specific name. The imported name serves as an alias for the default export in your code.
Higher-order functions that alter the execution context of another function are often referred to as __________.
- Decorators
- Generators
- Closures
- Combinators
Decorators in JavaScript are higher-order functions that alter the behavior or execution context of another function. They are often used to add functionalities to functions or methods.
When exporting a class or function as a default export, it's not necessary to use the ________ keyword.
- export default
- default
- export
- class
When exporting a class or function as a default export, you can simply use export default followed by the class or function declaration without explicitly using the function or class keywords.