Chapter05_01.html

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
    <script src="jquery-1.8.3.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            // testBetween();
            var result = range(3, 6);
            alert(result);
        });

        // 遍历数组对元素执行一个操作
        function foreach(array, action) {
            for (var i = 0; i < array.length; i++) {
                action(array[i]);
            }
        }

        // 使用 foreach 函数汇总数组
        function sum(numbers) {
            var total = 0;
            foreach(numbers, function (number) {
                total += number;
            });
            return total;
        }

        //        function negate(func) {
        //            return function (x) {
        //                return !func(x);
        //            };
        //        }

        function negate(func) {
            return function () {
                return !func.apply(null, arguments);
            };
        }

        var isNotNaN = negate(isNaN);
        // alert(isNotNaN(NaN));


        /*归约函数*/
        function reduce(combine, base, array) {
            foreach(array, function (element) {
                base = combine(base, element);
            });
            return base;
        }

        function add(a, b) {
            return a + b;
        }

        function sum(numbers) {
            return reduce(add, 0, numbers);
        }

        function foreach(array, action) {
            for (var i = 0; i < array.length; i++) {
                action(array[i]);
            }
        }

        // 计算数组中0的个数
        function countZeroes(array) {
            function counter(total, element) {
                return total + (element === 0 ? 1 : 0);
            }

            return reduce(counter, 0, array);
        }

        var numbers = [0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 8, 0];
        $(function () {
            alert(countZeroes(numbers));
        });

    </script>
</head>
<body>

</body>
</html>