es6/lexical_this_example.html at master · JavascriptAugusta/es6 · GitHub

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<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <script>
        document.writeln("ES5 way - passing in a thisArg for each iteration<br>");
        var maria = {
           _name: "Maria",
            _friends: ["Nancy", "Annette", "John"],
            printFriends: function() {
             this._friends.forEach(function (element) {
                document.writeln(this._name + " knows " + element + "<br>")
                }, this);
            }
        }
        var maria1 = Object.create(maria);
        maria1.printFriends();

        /*document.writeln("ES6 way - lexical this means no thisArg<br>");
        var bob = {
            _name: "Bob",
            _friends: ["Nancy", "Annette", "John"],
            printFriends: function() {
                this._friends.forEach(f =>
                    document.writeln(this._name + " knows " + f + "<br>"));
            }
        }
        var bob1 = Object.create(bob);
        bob1.printFriends();
        */
    </script>
</body>
</html>