javasciptマップセット

let set = new Set();
set.add({});
set.size //1
set.add({});
set.size //2


 // Map实现
      var m = new Map([
        ['a', 95],
        ['b', 75],
        ['c', 89],
        ['d', {
          'dName': 'tomc',
          'dAge': 19
        }]
      ]);
      var aValue = m.get('a'); //95
      var bValue = m.get('b'); //75
      var cValue = m.get('c'); //89
      var dValue = m.get('d'); // tomc 19
      console.log("aValue: " + aValue);
      console.log("bValue: " + bValue);
      console.log("cValue: " + cValue);
      console.log("dValue: " + dValue.dName, dValue.dAge);
      var n = new Map();
      n.set('admin', 89);
      console.log("n.get('admin'): " + n.get('admin')); //89
      n.set('admin', 999);
      console.log("n.get('admin'): " + n.get('admin')); //999
      n.set('bob', 90);
      var has = n.has('admin');
      console.log("has: " + has); // true