If you are facing any issue while a function is returning a response from an asynchronous call, then here you will get the right solution for it. In this article, we are going to tell you about the synchronous and asynchronous call.
If you are making a phone call to your friend and ask him a question, there is a possibility that he will take a little time. You may like to stare on the wall until he gives the answer that you want. This is what happens when you call a function with normal code.
Now, imagine that you have called your friend for the same reason as above. But this time, you want an answer quickly so you cut the call after telling him to call back. You can hang the call and move on to doing something that you want. Suddenly, he calls you back and gives you the required information. A similar thing happens in the case of Ajax request.
Here, you don’t have to wait for the response, as it is sent immediately and the executions continue. Also, the statement after the Ajax call is executed too. To get the response in the end, you have to supply a function for calling after the response will be received. Whatever statement that will come after this call will be executed before the calling of the callback.
We hope that you have learned the difference between the asynchronous and synchronous flow. Now, you can learn the solution. Sometimes, an asynchronous operation can give a synchronous counterpart that’s why it is recommended to not use it. Try to avoid it especially in the conditions of the browser.
Ever wondered why it is bad to ask so?
All these solutions built on top of each other are available in current browsers, and node 7+.