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README.md

HashTable

This module provides a simple implementation of a Hash Table in TypeScript. Note that this implementation is for academic purposes and a JavaScript Map() object likely suits the same needs. Notably, a Javascript Set() also implements a Hash Table under the hood.

Overview

A Hash Table is a data structure that maps keys to values for highly efficient lookup. This implementation uses separate chaining to handle collisions.

Features

  • Customizable Size: Initialize the hash table with a specific size.
  • Hash Function: Uses a custom hash function to convert keys into hash values.
  • Separate Chaining: Handles collisions using separate chaining with linked lists.

Usage

Creating a Hash Table

// defines the key and value types
const hashTable = new HashTable<string, number>(10)

Adding Entries

hashTable.set('key1', 100)
hashTable.set('key2', 200)

Retrieving Entries

const value = hashTable.get('key1') // 100

Removing Entries

hashTable.remove('key1')

Getting the Size

const size = hashTable.tableSize // 10

API

HashTable<K, V>

Constructor

  • constructor(size: number): Creates a new HashTable with the specified size.

Methods

  • set(key: K, value: V): void: Adds a key-value pair to the hash table.
  • get(key: K): V | undefined: Retrieves the value associated with the given key.
  • remove(key: K): void: Removes the key-value pair associated with the given key.
  • tableSize: number: Returns the size of the hash table.

Example

const hashTable = new HashTable<string, number>(10)

hashTable.set('apple', 1)
hashTable.set('banana', 2)

console.log(hashTable.get('apple')) // Output: 1
console.log(hashTable.get('banana')) // Output: 2

hashTable.remove('apple')
console.log(hashTable.get('apple')) // Output: undefined

Notes

  • This implementation is for educational purposes and may not be suitable for production use.
  • For more robust and feature-rich hash table implementations, consider using JavaScript's built-in Map object.

References