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let g = new Map();

g.set(1, [2,3]);

g.set(2, [3, 8]);

g.set(3, []);

let path = [];

let visited = new Set();

let step = 0;

const ip = (g, v) => {

 step++;

 console.log("------\nstep " + step);

 visited.add(v);

 path.push(v);

 console.log("Visiting and pushing " + v);

 const adj = g.get(v);

 console.log("Looking at subtree " + adj);

 if (adj.length > 0) {

  for (var w of adj) {

 if (path.includes(w)) {

  return true;

 }

 return ip(g, w);

 }

 }

 path.pop();

 console.log("Popping at path=" + path);

 return false;

}

const result = ip(g, 1);

console.log("---------\nAnd the result is: " + result);