Science Knowings: JavaScript Course For Social Media

Set Object

Set Object: Introduction

Welcome back! In this session, we dive into the world of Set Objects in JavaScript. A Set Object is a collection of unique values that maintains the insertion order of the elements.

Set Object: Implementation

const mySet = new Set();

You can also initialize a Set Object with an iterable (e.g., an array) using the new Set(iterable) syntax.

Set Object: Methods

Method Description
add(value) Adds a new value to the set.
delete(value) Deletes a value from the set.
has(value) Checks if a value exists in the set.
clear() Removes all elements from the set.
size Returns the number of elements in the set.

Set Object: Applications

  • Removing duplicate elements from an array
  • Performing set operations (union, intersection, difference)
  • Creating unique identifiers
  • Storing unique values in a database

Set Object: Benefits

  • Efficient for checking if an element exists (O(1))
  • Preserves the insertion order of elements
  • Lightweight and memory-efficient

Set Object: Drawbacks

  • Cannot store duplicate values
  • No direct access to elements by index

Set Object: Best Practices

  • Use Set when you need to store unique values.
  • Consider using a Map if you need to associate values with keys.
  • Be aware of the limitations of Set (no duplicates, no indexed access).

Set Object: Examples

// Create a set of unique numbers
const numbers = new Set([1, 2, 3, 4, 5]);

// Check if a number exists in the set
console.log(numbers.has(3)); // true

// Add a new number to the set
numbers.add(6);

// Get the size of the set
console.log(numbers.size); // 6

Set Object: Code Examples

Here are some additional code examples to practice using Set Objects:

  • Removing duplicates from an array: const uniqueArray = [...new Set(array)]
  • Performing set operations: const union = new Set([...set1, ...set2])

Set Object: Quiz

Test your understanding with a quick quiz:

  1. What is the main advantage of using a Set Object?
  2. Name two methods of the Set Object.
  3. Give an example of how you can use a Set Object to remove duplicate elements from an array.

Next Topic: Map Object

In the next session, we'll explore the Map Object in JavaScript. A Map Object stores key-value pairs, allowing you to associate values with unique keys. Join us to learn more about this powerful data structure!