@esfx/collections-hashset
The @esfx/collections-hashset
package provides HashSet
, a collection class that utilizes @esfx/collection-core
and @esfx/equatable
.
Overview
Installation
npm i @esfx/collections-hashset
Usage
NOTE: The examples below use the following definition of
Person
:import { Equatable, Equaler, Comparable, Comparer } from "@esfx/equatable"; class Person { constructor(firstName, lastName) { this.firstName = firstName; this.lastName = lastName; } toString() { return `${this.firstName} ${this.lastName}`; } [Equatable.equals](other) { return other instanceof Person && this.lastName === other.lastName && this.firstName === other.firstName; } [Equatable.hash]() { return Equaler.defaultEqualer.hash(this.lastName) ^ Equaler.defaultEqualer.hash(this.firstName); } [Comparable.compareTo](other) { if (!(other instanceof Person)) throw new TypeError(); return Comparer.defaultComparer.compare(this.lastName, other.lastName) || Comparer.defaultComparer.compare(this.firstName, other.firstName); } }
HashSet
import { HashSet } from "@esfx/collections-hashset";
// NOTE: see definition of Person above
const obj1 = new Person("Bob", "Clark");
const obj2 = new Person("Bob", "Clark");
const set = new Set(); // native ECMAScript Set
set.add(obj1);
set.add(obj2);
set.length; // 2
const hashSet = new HashSet();
hashSet.add(obj1);
hashSet.add(obj2);
hashSet.length; // 1
API
You can read more about the API here.