Mastering JavaScript Functional Programming

Continuation Passing Style

The preceding code, in which you call a function but also pass another function that is to be executed when the input/output operation is finished, can be considered a case of CPS - Continuation Passing Style. What is this way of coding? A way of putting it, is by thinking about this question: how would you program if using the return statement was forbidden?

At first glance, this may appear to be an impossible situation. We can get out of our fix, however, if we grant this: you are allowed to pass a callback to the called function, so when that procedure is ready to return to the caller, instead of actually returning, it shall invoke the passed callback. In these terms, the callback provides the called function ...