A callback function, also known as a higher-order function, is a function that is passed to another function as a parameter, and the callback function is called (or executed) inside the parent function.
99 How to explain callbacks in plain English? In plain English, a callback function is like a Worker who "calls back" to his Manager when he has completed a Task. How are they different from calling one function from another function taking some context from the calling function?
A callback in C is a function that is provided to another function to "call back to" at some point when the other function is doing its task. There are two ways that a callback is used: synchronous callback and asynchronous callback.
A callback can be implemented as a delegate to a method, but you could equally say that passing an object that supports a callback method on its interface is a callback.
A callback is the building block of asynchronous processing. Think of it this way: when you call someone and they don't answer, you leave a message and your phone number. Later on, the person calls you back based on the phone number you left. A callback works in a similar manner. You ask an API for a long running operation and you provide a method from within your code to be called with the ...
In the snippet above, the setTimeout function takes 2 arguments, the callback function and a minimum time in ms for the function to be called, so when passing the callback function we're going to use bind and specify the parameters
A callback is a hook into the code that is executing to allow you to provide customised features at known points in the process. It allows for generalised control structures to perform customised operations which are specified by your code which is called from within them, hence the term "call back" - it calls back into your code.
Possible Duplicate: What is a callback function? I have read the wikipedia definition of a callback but I still didn't get it. Can anyone explain me what a callback is, especially the following line In computer programming, a callback is a reference to executable code, or a piece of executable code, that is passed as an argument to other code.
1) What is a "callback hell" for someone who does not know javascript and node.js ? This other question has some examples of Javascript callback hell: How to avoid long nesting of asynchronous functions in Node.js The problem in Javascript is that the only way to "freeze" a computation and have the "rest of it" execute latter (asynchronously) is to put "the rest of it" inside a callback. For ...
A callback is a function provided by the consumer of an API that the API can then turn around and invoke (calling you back). If I setup a Dr.'s appointment, I can give them my phone number, so they can call me the day before to confirm the appointment. A callback is like that, except instead of just being a phone number, it can be arbitrary instructions like "send me an email at this address ...
