How To Create And Use Hash Tables in JavaScript

How To Create And Use Hash Tables in JavaScript

A hash table is a data structure which consists of key and value pairs.

A hash table is a data structure which consists of key and value pairs. A good analogy is thinking of it like a dictionary (the book), the keys are the words and the values are the definitions. If you think that sounds familiar, you’re correct, JavaScript Objects are an example of a hash table. That being said, using JavaScript’s built in Object or Map, is going to be faster and more optimal than what I implement here. This blog is more about understanding the concepts behind a hash table.

Pros and Cons of a Hash Table

Pros

  • Fast lookup
  • Fast insertion
  • Fast deletion

Cons

  • Hash Collisions (particularly when there are lots of them)
  • Not efficient on small amounts of data
  • Not very efficient for searching for a value without knowing the key (iterating over the hash table)
  • Not good for sorting

javascript algorithms

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