Question

I learn now that a callback is function that pass to argument.
but I can do it without so what is the point?
for example

function i()
{
 alert("callback");
 }
function p(a)  
{
for(r=0;r<100;r++)
{document.write(r);}
a();
}
p(i);

or

   function i()
{
alert("callback");
 }
function p()  
{
for(r=0;r<100;r++)
{document.write(r);}
i();}

I searched but could not find an answer

Answer 1

Callbacks are usually used when you want to do something with some data that isn’t immediately available.

For example, to process some data from an HTTP response when the response arrives or to perform an action based on where a mouse click occurred when the mouse button is clicked.