26     let map = new Map();  variable
43     map.set("test plainarray add:", res)
44     map.set("test plainarray length:", proxy.length === 6)
45     map.set("test plainarray has:", proxy.has(2))
46     map.set("test plainarray getIndexOfValue:", proxy.getIndexOfValue("1") === 1)
47     map.set("test plainarray getIndexOfKey:", proxy.getIndexOfKey(5) === 5)
48     map.set("test plainarray getKeyAt:", proxy.getKeyAt(1) === 1)
49     map.set("test plainarray getValueAt:", proxy.getValueAt(2) === "2")
58     map.set("test plainarray clone:", res)
62     map.set("test plainarray removeRes:", removeRes)
76     map.set("test plainarray removeRangeFrom:", removeFrom)
82     map.set("test plainarray forEach:", res)
89     map.set("test plainarray for of:", res)
99     map.set("test plainarray Symbol.iterator:", res)  variable
110     map.set("test plainarray setValueAt and get:", proxy1.get(2) === "123")
112     map.set("test plainarray clear:", proxy1.length === 0)
113     map.set("test plainarray isEmpty:", proxy1.isEmpty())
120     map.set("test plainarray toString:", proxy1.toString() == "0:0,1:1,2:2,3:3,4:4,5:5");
123     function elements(value, key, map) {  argument
131     map.forEach(elements);