Javascript callback implementation

Question

This has been addressed, please see the answer located at -> Create a custom callback in JavaScript

without seeing what's returned in your `"data"`... hard to tell — Roko C. Buljan, Feb 16 '14 at 15:58
The returned data could be anything. Let us assume it is the responseText of google which contains the google.com source. — Jesse, Feb 16 '14 at 15:58
I don't understand what `eval()` has to do with invoking a callback. If you pass a function as a callback, then the function can just be called. The question really isn't clear. — Pointy, Feb 16 '14 at 15:59
replace `if (typeof (b) !== 'undefined') with `if (typeof (b) === 'function ') ` and do `b();` — Royi Namir, Feb 16 '14 at 16:00
@yivi - Why are you responding to a 7 year old question that I already edited 6 years ago to include the same link listed in your comment? — Jesse, May 16 '21 at 12:35

score 2 · Accepted Answer · answered Feb 16 '14 at 16:00

You can use b() to invoke the function "b" if it is a function. You can also use the apply method to invoke a function. On the subject of callbacks, you may be interested in this article about the Promise API, since it provides an example of "get" and "getJSON" method that are consistent with this API.

Javascript callback implementation

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