What is the proper usage of the WeakMap in JavaScript? What kind of timing issues may occur when I use it? IN particular, I am wondering what would happen in the following situation:
var wm1 = new WeakMap()
var o1 = {},
o2 = function(){},
o3 = window;
// in other method:
wm1.set(o1, 37);
wm1.set(o2, "azerty");
if (wm1.has(o2)) {
//Garbage collection happen here, objects from wm1 may no longer exists
Console.log(wm1.get(o2)) // what will happen here? just undefined? null?
}
how GC will affect WeakMaps?
Update: my bad, I missed the fact that you can't have string as keys in WeakMap, my question does not make if I take into account that fact.