why i am getting syntax error in internet explorer 11 but in chrome it's perfectly working

Question

i have one java script method which is perfectly working in chrome but in internet explorer 11 i ma getting syntax error in this method

 onMenuOpen: function (e) {
            var isIe = detectIE();
            if (isIe === false){
                var itemKeys = [e.target.dataset.id];
                var menu = e.sender;
                menu.setOptions({
                    dataSource: itemKeys.map((itemKey) => {
                        return {
                            text: "<div data-item-key='" + itemKey + "'>ADD</div>",
                            cssClass: "context-menu-item",
                            encoded: false
                        };
                    })
                });
            }
        },

i am getting error in this line " dataSource: itemKeys.map((itemKey) => " could any one pleasehelp for this problem