29     let map = new Map();  variable
32     map.set("test proxy isEmpty ture:", proxy.isEmpty() == true)
40     map.set("test proxy isEmpty false:", proxy.isEmpty() == false)
48     map.set("test stack add:", res)
57     map.set("test stack forEach:", res)
67     map.set("test stack for of:", res)
82     map.set("test stack Symbol.iterator:", res)  variable
84     map.set("test stack peek:",  proxy.peek() === 9)
85     map.set("test stack locate:",  proxy.locate(5) === 5)
94         map.set("test proxy stack pop:" + i, popProxy.pop() == i);
98     function elements(value, key, map) {  argument
106     map.forEach(elements);