what is $ q service in angular? why i need this?

Hi Naveen,

 

The $q service is helping us to sending requests in an asynchronous way.

 

For Example :

 

If I want to send multiple requests and perform the callback when all the responses have been received. We can use this $q service in angular(Promise Technique) to achieve it.

 

The multiple request can be multiple functions too.

Have a look at the below links:

 

https://toddmotto.com/promises-angular-q 

 

http://haroldrv.com/2015/02/understanding-angularjs-q-service-and-promises/ 

 

https://docs.angularjs.org/api/ng/service/$q

 

http://jsfiddle.net/Zenuka/pHEf9/21/