[SPOILERS] Regarding value solution about exercises

[kolodny]

That would be correct if the argument passed in always returned functions which isn't something that the function handles.

function value(val) {
  if (typeof val === 'function') return value(val());
  return val;
}
var fn = function() { return fn; };
value(fn); // stackoverflow

Using an iterative approach would just cause this to hang:

function value(val) {
  var current = val;
  while (typeof current === 'function') current = current();
  return current;
}
var fn = function() { return fn; };
value(fn); // hangs, run at your own risk

You may think there's an argument to make for the recursive approach since you can have a try-catch block around it if it is an invalid input, but for the same price you can have a loop counter in the iterative approach and throw once it breaks a threshold.

Let me know if there's anything I missed or misunderstood, and I'll reopen this issue.

[zg]

This doesn't hang and it also passed all tests:

module.exports = value;

function value(val) {
  while(typeof val === 'function')
    val = val();
  return val;
}

[kolodny]

Sure. so does this

module.exports = value;

function value(thing) {
  return typeof thing === 'function' ? value(thing()) : thing;
}

It doesn't cause a stack overflow because it has an termination condition