Boilerplate code to implement hash tables in JavaScript.

myHashTable_boilerplate.js

class HashTable {
    constructor(size) {
        this.data = new Array(size);
    }
 
    // Hash Function
    _hash(key) {
        let hash = 0;
        for (let i = 0; i < key.length; i++) {
            hash = (hash + key.charCodeAt(i) * i) % this.data.length;
        }
        return hash;
    }
 
    // Insert key-value pair
    set () {}
  
    // Lookup a key
    get () {}
  
    // Return all the keys in the object.
    keys () {}
}
 
const myHashTable = new HashTable(50);
myHashTable.set('has_garden', true);
myHashTable.get('has_garden');        // true

myHashTable.set('house_number', 54);
myHashTable.get('house_number');      // 54

myHashTable.set('street_name', 'Main Street');
myHashTable.get('street_name');       // 'Main Street'

myHashTable.keys();    // [ 'has_garden', 'house_number', 'street_name' ]