Prototype实战教程----9.Array

<script src="prototype.js"></script>
<script>
/**//*var arr = [1,2,3,4,8,5,4,3];
// 依次输出1,2,3,4,5,4,3
arr.each(
    function (item, index) {
        if (item < 6) {
            alert(item);
        } else {
            throw $continue;
        }
    }
);
// 依次输出1,2,3,4
arr.each(
    function (item, index) {
        if (item < 6) {
            alert(item);
        } else {
            throw $break;
        }
    }
);*/


/**//*
var arr = [1,2,3,4,5];
// arr = [1,2,3,4,5]
arr.reverse(false);
alert(arr.inspect());
// arr = [5,4,3,2,1]
arr.reverse();
alert(arr.inspect());


var arr = [1,2,3,4,5];
arr.reverse();
// 返回2在arr中的序号：1
var index = arr.indexOf(2);
alert(index)


var arr = [1,2,3,4,5];
// 不包含2和4，返回[1,3,5]
var newArr = arr.without(2,4);
alert(newArr.inspect());


var arr = [1,2,3,4,5];
arr.clear();
alert(arr[2]);


var arr = [1,2,3,4,5];
var arr2 = [2,4,6,8,10];
//[ [1,2],[2,4],[3,6],[4,8],[5,10]]
var newArr = arr.zip(arr2);
// [[1,4],[4,16],[9,36],[16,64],[25,100]]
var newArr2 = arr.zip(
    arr2,
    function (item) {
        var newItem = item.collect(
            function (item, index) {
                return item * item;
            }
        );
        return newItem;
    }
);
alert(newArr.inspect());
alert(newArr2.inspect());


var arr = [5,2,3,1,4];
// 将arr排序
var arr = arr.sortBy(
    function (item, index) {
        return item;
    }
);

arr.each(
    function (item, index) {
        alert(item);
    }
);


var arr = [
    {root: 1, square: 1},
    {root: 2, square: 4},
    {root: 3, square: 9},
    {root: 4, square: 16},
    {root: 5, square: 25}
];
var newArr = arr.pluck("square");
alert(newArr[4]);



var arr = [1,2,3,4,5];
var ptArr = arr.partition(
    function (item, index) {
        return item%2 == 1;
    }
);
var oddArr = ptArr[0];
var evenArr = ptArr[1];
oddArr.each(
    function (item) {
        alert(item);
    }
);
evenArr.each(
    function (item) {
        alert(item);
    }
);


var arr = [1,2,3,4,5];
// 最大值
var max = -arr.min(
    function (item, index) {
        return -item;
    }
);

// 最小值
var min = arr.min();
alert(max);
alert(min);


var arr = [1,2,3,4,5];
// 最大值
var max = arr.max();

// 最小值
var min = -arr.max(
    function (item, index) {
        return -item;
    }
);
alert(max);
alert(min);


// 求集合中每一个元素的平方
Number.prototype.square = function () {
    return this * this;
}
var arr = [1,2,3,4,5];
var newArr = arr.invoke("square");
alert(newArr[4]);


// 计算arr中所有数的乘积
var factorial = arr.inject(
    1,
    function (accumulator, item, index) {
        return accumulator * item;
    }
);
alert(factorial)

// 判断集合中是否包含”2“
var inc = arr.include(2);
alert(inc);

var arr = ["12345", "abc2", "cde", "fgh", "132ba"];
var newArray = arr.grep(
    /2/,
    function (item, index) {
        return item + " contains 2";
    }
)
newArray.each(
    function (item) {
        alert(item);
    }
);


var arr = [1,2,3,4,5];
// 返回集合中所有的奇数
var oddArr = arr.findAll(
    function (item, index) {
        return item%2 == 1;
    }
);
alert(oddArr[2]);

// 返回第一个大于3的元素
var ele = arr.find(
    function (item, index) {
        return (item > 3);
    }
);
alert(ele);

var newArr = arr.collect(
    function (item, index) {
        return item * (index + 1);
    }
);
var hasNegative = arr.any(
    function (item, index) {
        return (item < 0);
    }
);


// 测试集合中的所有元素是否大于0
var allPositive = arr.all(
    function(item, index) {
        return (item > 0);
    }
)
alert(allPositive);

arr.each(
    function (item, index) {
        alert("arr[" + index + "] = " + item);
    }
);*/
</script>