Please enable JavaScript.

Coggle requires JavaScript to display documents.

Datatypes - Coggle Diagram

- - - - Array.from(obj[, mapFn, thisArg])
- - - - Object.getOwnPropertySymbols that returns an array of only symbolic keys
      - Reflect.ownKeys(obj) that returns all keys.
- - - - WeakMap is that keys must be objects, not primitive values
    - - WeakMap does not support iteration and methods keys(), values(), entries(), so there’s no way to get all keys or values from it.
    - - weakMap.set(key, value)
      - weakMap.get(key)
      - weakMap.delete(key)
      - weakMap.has(key)
    - - We put the data to a WeakMap, using the object as the key, and when the object is garbage collected, that data will automatically disappear as well.
    - - We can store (“cache”) results from a function, so that future calls on the same object can reuse it.
  - - - It is analogous to Set, but we may only add objects to WeakSet (not primitives).
      - An object exists in the set while it is reachable from somewhere else.
      - Like Set, it supports add, has and delete, but not size, keys() and no iterations.