Is there a way to create hashmap in javascript and manipulate it like adding and deleting values

Question

My requirement is to store key-value pairs in a data structure and fetch or delete the pairs when necessary using keys in JavaScript.

How can I do it in JavaScript as one does it in Java?

I have seen an answer creating an instance of hash map like:

var hash={};

Now Ie can add values in it like:

hash={ "January":"1","Feb":"2" }

Can I insert values dynamically using keys and fetch them and also get the size of the hash map?

Answer 1

Yes, that's an associative array (var hash = new Object();)

//You can add in these ways:

hash.January='1';
hash['Feb']='2';

//For length:
console.log(Object.keys(hash).length)

//To fetch by key:
console.log(hash['Feb']) // '2'

//To fetch all:
for(var key in hash){
    console.log('key is :' + key + ' and value is : '+ hash[key])
}