4 ms·

They only need a unique id for the object, they can't hash based on the object contents because those can change and because two objects with exactly the same p

They only need a unique id for the object, they can't hash based on the object contents because those can change and because two objects with exactly the same properties are not equal in JS: assert({} === {}); // throws

infogulch 9y ago
But couldn't the hash be based on the object pointer or something?
- sushibowl 9y ago
  Doesn't work because the GC moves objects around in memory
- tzahola 9y ago
  No, because the GC is free to move objects around to compact the heap.
- phpnode 9y ago
  No, for reasons others have said, but they can use the pointer to deal with collisions