javascript - what exactly is "call"/"apply" doing here?

callback.apply( object[ name ], args
) is simply calling function callback with
object[name] as context (this) and
args as arguments. jQuery provides a way to break a loop by
returning false, as stated in href="http://api.jquery.com/jquery.each/" rel="nofollow">the
docs:

We can break the $.each() loop at a particular
iteration by making the callback function return false.
Returning non-false is the same as a continue statement in a
for loop; it will skip immediately to the next
iteration.

So, this piece of
code:

if ( callback.apply( object[ name ],
            args ) === false ) {

            break;
}

checks if the
function returns false, and if yes, breaks the
loop.

---

If we skip the context part,
the code could look like this (in ES6):

if
            (callback(...args) === false) {

            break;
}