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Map traversal methods are: 1, with forEach () function, syntax "map.forEach (function (value,key) {...}"; 2, using "for..of" loop statement, syntax "for ([key, value] of map object) {...}".

The operating environment of this tutorial: windows7 system, ECMAScript version 6, Dell G3 computer.

Map is the structure of a set of key-value pairs with extremely fast search speed. Created by passing in an array of arrays.

Traversal method of Map object

ForEach ()

For..of traverses keys, values, entries

Iterator.next () traverses keys, values, entries

1. ForEach () function

Var map = [{key: "Baidu", value: "Robin Li"}, {key: "Alibaba", value: "Jack Ma"},]; map.forEach (function (value, key) {console.log (key, value);})

2. For..of cycle

Keys = map.keys (); for (key of keys) {console.log (key); / / map.get (key) can get the value. } values = map.values (); for (value of values) {console.log (value);} entries = map.entries (); for ([key, value] of entries) {console.log (key, value);}

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