Creating an associative array in JavaScript?

You can create an associative array in JavaScript using an array of objects with key and value pair.

Associative arrays are basically objects in JavaScript where indexes are replaced by user defined keys.

Example

var customerDetails=
[
   {
      "customerId":"customer-1",
      "customerName":"David",
      "customerCountryName":"US"
   },
   {
      "customerId":"customer-2",
      "customerName":"Bob",
      "customerCountryName":"UK"
   },
   {
      "customerId":"customer-3",
      "customerName":"Carol",
      "customerCountryName":"AUS"
   }
]
for(var i=0;i<customerDetails.length;i++){
   console.log(customerDetails[i].customerName);
}

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo115.js.

Output

This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo115.js
David
Bob
Carol