Is there any way to know if a function is asynchronous or synchronous in node.js ? Thanks in advance.
1
-
Function will be executed asynchronously if it does any I/O(network,filesystem etc) activity, otherwise it is synchronousPiyush Sagar– Piyush Sagar2016-02-11 14:48:01 +00:00Commented Feb 11, 2016 at 14:48
Add a comment
|
2 Answers
There's no programmatic way to tell.
The reliable way is to read the documentation.
You can also try to infer it from the function accepting a callback (but that isn't reliable, see Array.prototype.forEach for an example of a synchronous function that accepts a callback).
Comments
You can guess by the function profile. But you can't be really sure. For example if a function ask a callback in a parameter or if it returns a promise, it's probably asynchronous.
But you have no way to be sure. A function can ask a callback and do a synchronous work. It can even returns a promise and still be synchronous.
You have to read the documentation to be sure.
