Background
I'm new to JavaScript and am solving various formulations of the Josephus Problem to better understand the syntax. Using a circularLinkedList implementation*, I've solved the classic formulation: Wikipedia||Numberphile. I've also solved the problem for any fixed number of fighters and a fixed number of skips between eliminations (e.g., if skipping two fighters between eliminations, 1 eliminates 4, 5 eliminates 8, etc). I am now trying to solve the problem given any function that indicates the number of skips at a given moment.
Problem
I can't access the return value of my skip function. I understand from 1, 2, 3 that my issue involves asynchronicity, but am having trouble isolating takeaways from the long responses involving AJAX and jQuery, which I'm unfamiliar with. Could I get an ELI5 solution? I apologize for my lack of understanding.
Code
function winnerStepFunc(num, func) {
let cll = new circularLinkedList(); //Initializing list with participants
for (let a = 0; a < num; a++) {
cll.append(a);
}
function next(funcSteps) { //Generating string indicating #steps from function's output
let toEvaluate = "start";
for (let i = 0; i < funcSteps; i++) {
toEvaluate += ".next"
}
return toEvaluate;
}
let start = cll.getHead(); //Selecting first eliminator
while (cll.size() > 1) {
let toCheck = func(); // PROBLEM LINE
console.log("toCheck = " + toCheck); //toCheck = undefined
let str = next(toCheck);
while (eval(str) !== start && cll.size() > 1) { //
let locCurrent = cll.indexOf(start.element);
start = eval(str).next;
cll.removeAt(((locCurrent + toCheck)% cll.size()));
}
cll.delete(eval(str).next.element);
start = start.next;
}
console.log(start.element + 1);
}
function callFunction(name, args) { // builds function string to be evaluated
let result = name + "(";
for (let i = 0; i < args.length -1; i++) {
result += args[i] + ", ";
}
result += args[args.length-1] + ")";
return result;
}
function callFunction(name) {
let result = `${name}()`;
return result;
}
function addOne() { //<--The first basic example I'm trying:
return ++globalTimes; //Make the step increase by one for each elimination
}
var globalTimes = 0;
winnerStepFunc(12, function(){eval(callFunction("addOne"))});
