Hashtable.js

class HashTable {
  constructor(size){
    this.data = new Array(size);
  }

  _hash(key) {
    let hash = 0;
    for(let i=0; i < key.length; i++){
      hash = (hash + key.charCodeAt(i) * i) %  this.data.length;
    }

    return hash;
  }

  set(key, value) {
    let address = this._hash(key);
    if(!this.data[address]){
      this.data[address] = [];
    }

    this.data[address].push([key,value]);
    return this.data;
  }

  get(key){

    let address = this._hash(key);
    let currentBucket = this.data[address];

    if(currentBucket){
      for(let i=0; i < currentBucket.length; i++){
        if(currentBucket[i][0] === key)
          return currentBucket[i][1];
      }
    }

    return undefined;
  }
}

const myHashTable = new HashTable(50);
myHashTable.set('grapes',10000);
myHashTable.set('grappe',120);
console.log(myHashTable.get('grapes'));
console.log(myHashTable.get('grappe'));