JavaScript Sets and Maps

JavaScript Sets

• Sets store unique values of any data type, including primitive values and object references.
• Sets are used to remove duplicate values from arrays.
• Sets can be converted back to arrays using the spread operator (...).

JavaScript Set Methods

• add(value): Adds a value to the set.
• delete(value): Deletes a specific value from the set.
• clear(): Removes all elements from the set.
• has(value): Checks if a value exists in the set, returns a boolean.
• size: Returns the number of elements in the set.

Differences Between Arrays and Sets

• Arrays are ordered lists of objects, accessible by integer index.
• Sets are unordered collections of unique elements, without integer indices.
• Sets are not a replacement for arrays but offer a different data structure to work with unique elements.
• Sets simplify removing duplicates from arrays.

JavaScript Maps

• Maps store key-value pairs, preserving the order of key insertion.
• Maps allow both primitive values and objects as keys and values.
• Maps are used to overcome the limitations of JavaScript objects in handling multiple key objects, where only the last key object is stored.

JavaScript Map Methods

• set(key, value): Adds a key-value pair to the map.
• delete(key): Removes the key-value pair associated with the specified key.
• clear(): Removes all key-value pairs from the map.
• has(key): Checks if a key exists in the map, returns a boolean.
• size: Returns the number of key-value pairs in the map.

JavaScript Maps vs. Objects

• JavaScript objects only store the last value assigned to a key if multiple key objects are added.
• Maps store all key-value pairs, making them suitable for situations requiring multiple key objects.
• Maps solve the issue of overwriting values in objects when adding multiple key objects.

Explore the concepts of Sets and Maps in JavaScript. Learn about how Sets store unique values and their various methods, as well as how Maps maintain key-value pairs. This quiz will deepen your understanding of these important data structures in JavaScript.