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how to create a hashtable in typescript which can store both number and string using generic code




running sample

https://stackblitz.com/edit/typescript-2zlayw


code=>

//hash node
class HashNode<T,U>
{
    key:T
    value:U
    constructor(_key:T,_value:U)
    {
        if(typeof _key==="object")
          throw new Error("object as key not allowed")
        this.key=_key;
        this.value=_value;
    }
    //get key
    public getKey()
    {
       return this.key;
    }
    //get value
    public getValue()
    {
       return this.value;
    }

}
//hash table
class HashTable<T,U>
{
   static TABLE_SIZE = 128;
    private table=[];
   //HashTable
   constructor()
   {
      for(let i=0;i<HashTable.TABLE_SIZE;i++)
      {
          this.table[i]=undefined
      }
   }
   //getHashIndex
   private getHashIndex(_key:T)
   {
     let hashIndex=0;
     if(typeof _key==="number")
     {
         hashIndex=_key%HashTable.TABLE_SIZE;
     }else
     {
        let hash=0
        for(let i=0;i<_key.length;i++)
        {
           hash+=_key[i].charCodeAt();     
        }
         hashIndex=hash%HashTable.TABLE_SIZE;
       
     }
       
   return hashIndex;
   }
   //Put
   public Put(_key:T,_value:U)
   {
       let hashIndex=this.getHashIndex(_key);
       while(this.table[hashIndex]!==undefined  && this.table[hashIndex].getKey()!==_key)
       {
         hashIndex=(hashIndex+1)%HashTable.TABLE_SIZE;
       }
       this.table[hashIndex]=new HashNode<T,U>(_key,_value);
   }  
   //get
   public Get(_key:T):any
   {
       let hashIndex=this.getHashIndex(_key);  
       while(this.table[hashIndex]!==undefined  && this.table[hashIndex].getKey()!=_key)
       {
         hashIndex=(hashIndex+1)%HashTable.TABLE_SIZE;
         if(this.table[hashIndex]===undefined)
           return -1;

       }
       return this.table[hashIndex].getValue();
   }
}

//create a hashtable number as a key
let hashtable=new HashTable<number,string>();
hashtable.Put(1,"apple");
hashtable.Put(2,"mango");
hashtable.Put(3,"banana");
hashtable.Put(7,"cheek");
console.log(hashtable.Get(7));
//create another hashtable string as key
let hashtable1=new HashTable<string,string>();
hashtable1.Put("face1","daragon");
hashtable1.Put("face2","appldaragon");
hashtable1.Put("face3","daragon22323");
hashtable1.Put("face2","manumanu");

console.log(hashtable1.Get("face2"))

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