  |
| Fooのプロトタイプ | Foo.prototypeのプロトタイプ | |
|---|---|---|
| class Foo | Function.prototype | Object.prototype |
| class Foo extends Class | Class | Class.prototype |
| class Foo extends NullOrObject | Function.prototype | NullOrObject |
| writable | configurable | enumerable | |
|---|---|---|---|
| Foo.prototype | ☓ | ☓ | ☓ |
| Foo.constructor | ○ | ○ | ☓ |
| Foo.prototype.* | ○ | ○ | ☓ |
16
