JavaScript Sets and Maps

This video tutorial introduces two important data structures in JavaScript: sets and maps. Sets are collections of unique items, and the video demonstrates how to create, add, delete, and iterate through sets. It also explains how sets automatically reject duplicate values. The tutorial then shifts focus to maps, which store data in key-value pairs. The video shows how to create maps, add entries, and iterate through them using loops. By the end, viewers will understand the basic operations and use cases for sets and maps in JavaScript.

What is a key characteristic of a set in JavaScript?

• It allows duplicate values.

• It maintains the order of elements.

• It is a type of array.

• It only contains unique values.

How do you add an element to a set in JavaScript?

• Using the insert method.

• Using the append method.

• Using the add method.

• Using the push method.

What happens if you try to add a duplicate value to a set?

• An error is thrown.

• The duplicate value is added.

• The set is cleared.

• The duplicate value is ignored.

Which method is used to remove an element from a set?

• delete

• remove

• erase

• pop

How can you check if a set contains a specific element?

• Using the includes method.

• Using the has method.

• Using the contains method.

• Using the find method.

What is a map in JavaScript?

• A type of array.

• A function that transforms data.

• A collection of key-value pairs.

• A collection of unique values.

How do you retrieve a value from a map using a key?

• Using the get method.

• Using the fetch method.

• Using the find method.

• Using the retrieve method.

Which method is used to add a key-value pair to a map?

• insert

• add

• set

• push

What is the output of iterating through a map?

• Only values are output.

• Only keys are output.

• The map is converted to an array.

• Both keys and values are output.

What is a common use case for maps in JavaScript?

• Storing ordered lists.

• Storing unique values.

• Storing functions.

• Storing key-value pairs.