Full Stack Web Development MASTERY Course - Novice to Expert - Iterators in JavaScript

What is the primary purpose of an iterator in JavaScript?

• To traverse over a list or collection

• To sort elements in a collection

• To delete elements from a collection

• To modify elements in a collection

Which method is essential for an iterator to function properly?

• previous

• next

• end

• start

What does the 'done' property signify in an iterator?

• The current element in the sequence

• Whether the sequence has more elements to iterate

• The index of the current element

• The total number of elements

In the example function, what is the initial value of the 'counter' variable?

• 1

• 5

• 0

• 10

What happens when the 'counter' variable reaches 5 in the example function?

• The 'done' property is set to true

• The 'value' property is set to 5

• The 'value' property is set to undefined

• The 'done' property is set to false

What is returned by the 'next' method when there are no more elements to iterate?

• A 'done' property set to false

• A 'value' property set to undefined

• A 'done' property set to true

• A value of 0

What does the summary section emphasize about iterators?

• Iterators are used for sorting arrays

• Iterators define a sequence and return values

• Iterators are only used in JavaScript

• Iterators are not useful in programming