Understanding Scheme I think at least half of the problem with understanding this puzzle is the Scheme syntax, which most are not familiar with. First of all, I personally find the call/cc x to be harder to comprehend than the equivalent alternative, x get/cc. It still calls x, passing it the current continuation, but somehow … Read more
Imagine if every single line in your program was a separate function. Each accepts, as a parameter, the next line/function to execute. Using this model, you can “pause” execution at any line and continue it later. You can also do inventive things like temporarily hop up the execution stack to retrieve a value, or save … Read more
To compare it to C, the current continuation is like the current state of the stack. It has all the functions waiting for the result of the current function to finish so they can resume execution. The variable captured as the current continuation is used like a function, except that it takes the provided value … Read more
I believe that continuations are a special case of callbacks. A function may callback any number of functions, any number of times. For example: var array = [1, 2, 3]; forEach(array, function (element, array, index) { array[index] = 2 * element; }); console.log(array); function forEach(array, callback) { var length = array.length; for (var i = … Read more