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I am not so strong in javascript.
I have a common function that I call from many parts of my code passing them some parameters.
Can somebody help me on
Giving advice regarding the solution, if there's a better one, etc.
thanks a lot!
280
A custom callback function can be created by using the callback keyword as the last parameter. It can then be invoked by calling the callback() function at the end of the function. The typeof operator is optionally used to check if the argument passed is actually a function.
Passing a function to another function or passing a function inside another function is known as a Callback Function. Syntax: function geekOne(z) { alert(z); } function geekTwo(a, callback) { callback(a); } prevfn(2, newfn); Above is an example of a callback variable in JavaScript function.
Callback itself, as the name suggests (call - back) whenever you need to call a function after the execution of the first one, in those scenarios we need to use a callback.
A callback function is passed as an argument to another function whereas Promise is something that is achieved or completed in the future. In JavaScript, a promise is an object and we use the promise constructor to initialize a promise.
It is actually quite simple.
function callback() {
alert("I am in the callback!");
}
function work(func) {
alert("I am calling the callback!");
func();
}
work(callback);
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