This was for a simple test on reversing a linked list

foo.js

function log(msg) {
  console.log(msg);
}

reverseLinkedList.js

function Node(val) {
  this.val = val;
  this.next = null;
}

const Nodes = new Node("a");
Nodes.next = new Node("b");
Nodes.next.next = new Node("c");

const reverseList = list => {
  if (!list) return list;
  let node = list;
  let prev = null;

  while (node) {
    let tmp = node.next;
    node.next = prev;
    prev = node;
    node = tmp;
  }

  return prev;
};

console.log("Nodes: ", Nodes);
console.log("reverseList(Nodes): ", reverseList(Nodes));