A class in ES6 is a special type of function, and it can be declared using the ________ keyword.

function
class
object
define

In ES6, the class keyword is used to declare a class. Unlike functions, classes support class-based inheritance, providing a cleaner syntax for object-oriented programming in JavaScript.

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Which tool is essential for enabling tree shaking in a modern JavaScript project?

Webpack
Babel
ESLint
npm

Tree shaking is a process in Webpack that eliminates unused code, reducing the bundle size. By configuring Webpack properly, you can enable tree shaking and optimize your project for better performance.

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A const declaration ensures that the variable's __________ cannot be reassigned.

type
value
identity
scope

The correct option is 'value'. When a variable is declared with 'const' in JavaScript, its value cannot be reassigned. However, it's important to note that the const declaration does not make the variable itself immutable; it only ensures that the binding of the variable to a value remains constant.

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Iterators enable lazy evaluation, allowing elements to be processed one at a time, as opposed to ________ evaluation.

synchronous
asynchronous
parallel
concurrent

Iterators in JavaScript enable lazy evaluation, meaning elements are processed one at a time on demand, in contrast to synchronous evaluation, where all elements are processed at once. This supports more efficient resource utilization.

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Can a Symbol be automatically converted to a string when concatenated with a string?

Yes, Symbols are automatically converted to strings
No, attempting to concatenate a Symbol with a string will result in an error
Only if the Symbol has an associated description
Symbols cannot be concatenated with strings

No, a Symbol cannot be automatically converted to a string when concatenated with a string. Attempting to do so will not result in an error but will create a new string that includes the Symbol's description, if available, or the string representation of the Symbol.

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When creating a module that provides a primary functionality along with several auxiliary functions, how should you organize the exports?

export default PrimaryFunction; export { auxFunc1, auxFunc2 };
export { PrimaryFunction, auxFunc1, auxFunc2 }
export PrimaryFunction; export auxFunc1; export auxFunc2;
export PrimaryFunction, auxFunc1, auxFunc2;

Organizing exports with a named export for the primary functionality and auxiliary functions ensures clarity and flexibility when importing in other modules.

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In a class hierarchy, if a method is overridden, how can you call the method from the parent class?

Using this.method()
super.method()
parent.method()
class.method()

The 'super' keyword is used to call the overridden method from the parent class. It ensures that the overridden method in the subclass is bypassed, and the method from the parent class is invoked.

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How do mixins in ES6 help in achieving multiple inheritance?

Through Object Assignment
Using Class Hierarchy
Prototypal Inheritance
Closures

Mixins in ES6 are achieved by applying the properties and methods of one object to another using object assignment. This allows a single object to inherit functionalities from multiple sources, providing a form of multiple inheritance. Mixins enhance code reuse and flexibility by allowing the composition of behavior from different objects.

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When overriding a method in a subclass, use super.methodName() to call the original method from the _______ class.

child
parent
subclass
overridden

When overriding a method in a subclass, use super.methodName() to call the original method from the parent class. This allows the subclass to extend or modify the behavior of the parent method while still utilizing its functionality.

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How can you access both the index and value of an array element in a for...of loop?

for (let [index, value] of array.entries())
for (let {index, value} of array.entries())
for (let (index, value) of array.entries())
for (let index, value of array.entries())

In a for...of loop, you can use the entries() method on the array to access both the index and value. The returned value is an array where the first element is the index and the second element is the value. This destructuring assignment allows easy access to both index and value.

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