Map Set Weakmap Weakset

Weakmap.prototype.has (key) will return false afterwards. Dễ hiểu hơn thì phần tử trong set là unique nhé. Weakset objects are collections of objects.

The key as the first argument and the value as the second. Set 和 map 的主要应用场景在于 数据重组 和 数据储存. Which of the above data structures will produce the same/similar result of doing:

Weakmap.delete (key) additional data storage is the primary area application for weakmap.

Here is a simple real time solution on map, set, weakmap and weakset in javascript. Weakset objects are collections of objects. Set === weakset will evaluate to true under these circumstances. Just as with sets, each object in a weakset may occur only once;