Remove elements from Javascript Hash Table

To remove elements, we simply need to find them and remove them using a simple splice function call that removes elements in place from an array.

Let us look at the implementation of the same − 

Example

remove(key) {
   let hashCode = this.hash(key);

   for (let i = 0; i < this.container[hashCode].length; i++) {
      // Find the element in the chain
      if (this.container[hashCode][i].key === key) {
         this.container[hashCode].splice(i, 1);
         return true
      }
   }
   return false;
}

You can test this using − 

Example

let ht = new HashTable();

ht.put(10, 94); ht.put(20, 72);
ht.put(30, 1);
ht.put(21, 6);
ht.put(15, 21);
ht.put(32, 34);

console.log(ht.get(20));
console.log(ht.remove(20));
console.log(ht.get(20));
console.log(ht.remove(20));

Output

This will give the output −

{ key: 20, value: 72 }
true
undefined
false

This returned true the first time because it was found and deleted successfully. The next time, since it wasn't present, the remove function returned false.