How to create a JavaScript Dictionary and add key value pairs

Dictionary objects are very useful in any programming language. In this article let’s see how to create a JavaScript Dictionary and add key value pairs.

Many programming languages like C# and Java have a built-in functionality to create a dictionary items and add key-value pairs but JavaScript doesn’t natively include a type called “Dictionary”.

How to create a JavaScript Dictionary and add key value pairs

Creating a Dictionary in JavaScript

As discussed earlier there are not built-in type called as Dictionary in JavaScript. However, it’s very easy to create a hashtable/dictionary in JavaScript.

Step 1: Create a new JavaScript Object

We can create any data type of key value pairs in JavaScript. In the below code we will see how to access these dictionary values.

Step 2: Read the Dictionary objects

The step 1 will create a dictionary and also has key-value pairs in it. Now in order to populate the values of the object, we can use the below code.

Iterating key/value pairs in JavaScript

In order to iterate the dictionary objects in JavaScript, you could use a simple “for” loop as shown below.

 

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