@mattl019/objectset

objectset

objectset is an extension to the JavaScript Set data type that allows the use of objects as values.

Installation & Use

npm i @mattl019/objectset

import Cache from '@mattl019/objectset' // you can name it anything, I like cache as I use it for caching objects

let cache = new Cache("id")
cache.add({ id: 1, message: "Hey!" })
cache.addMany([
  { id: 1, message: "I will not be added since my ID already exists" },
  { id: 2, message: "I will be added though :)" }
])

cache.has(1) // true
cache.has(5) // false

cache.fetch(1) // { id: 1, message: "Hey!" }

cache.remove(1) // true

How it works

Each object must have an identical key with a unique value. In the example above, I used id as my unique key.

You can set the unique key in the constructor.

let cache = new Cache("id") // <-- unique id
cache.addMany([
  { id: 1, msg: "Hi" }, // each object added must have the unique id as a key and a value that uniquely identifies the object
  { id: 2, msg: "Bye" }
])

Methods

add(obj: Object): true | false

• Description: Adds an object to the Set.
• Parameters:
  • obj: Object: An object to add. Must have unique id as a key.
• Returns:
  • true: Object is successfully added.
  • false: Object already exists.

---

addMany(objArray: Object[]): true

• Description: Adds many objects to the Set
• Parameters:
  • objArray: Object[]: An array of objects to add. All objects must have unique id as a key.
• Returns:
  • true: Objects, excluding duplicates, successfully added.

---

remove(ukeyValue: any): true | false

• Description: Removes object with the unique id key value of ukeyValue
• Parameters:
  • ukeyValue: any: The value of the unique id key
• Returns:
  • true: Object is successfully removed.
  • false: Object does not exist.

---

has(ukeyValue: any): true | false

• Description: Checks if any object has a unique id key value of ukeyValue
• Parameters:
  • ukeyValue: any: The value of the unique id key
• Returns:
  • true: Object exists.
  • false: Object does not exist.

---

fetch(ukeyValue: any): Object | false

• Description: Fetches the object with unique id key value of ukeyValue
• Parameters:
  • ukeyValue: any: The value of the unique id key
• Returns:
  • Object: The object with unique id key value of ukeyValue
  • false: Object does not exist.

---

clear(): true

• Description: Clears the Set
• Returns:
  • true: Set is cleared.

Inspiration

Whilst creating a Twitter clone, I found I was often fetching posts or replies that I had already viewed. I quickly realized I could not use Object's with Set, so I decided to create this quick, mini extension to enable said ability. I have decided to release this in the hope someone else finds it useful! :)