Map understanding of data structures ES6

<Script>
     / * 
        Map data structure is introduced ES6, which is a class object, the object can only use common key string, and the keys of the map data structure may be used in any object, without limitation 
        Map is a constructor, by new Map () to construct 
        if necessary key to the data format, Map Object more suitable than 
        if the same key repeatedly assigned, then the previous values will be replaced after 
        have to traverse the same method set data structure traversal is the data sequence order of insertion 
        into an array of structures can be used to expand the operator ... 

    * / 
    the let Map = new new the Map ([ 
        [{a: 'a'}, 123 ], 
        [[], 'B' ], 
        [ function () {} 'array' ] 
    ]); 
    // method 
    map.set (1,1);     // SET () to add value 
    as map.get (. 1);   // read values
    map.size;     // get the number of members 
    map.has (1);     // verify whether the current data structure and returns a Boolean value of 
    the Map. the Delete (1); // delete the value 
    map.clear ();   // delete all values 
    
    // traversal methods 
    map.prototype.keys ();    // traversal keys 
    map.prototype.values (); // traversal key 
    map.prototype.entries (); // traversal key to 
    map.prototype .forEach (); // loop through all members
 
</ script>

 

As a white front-end, Typescript have come, how can you not grasp ES6 it?

We have to keep up with the script of the times, or only out of it.

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