node.js 数组

/////////////////////////////////////////////////////////////////////
// 二维数组
function twoDimensionalArray(xMax, yMax) {
    var arr = new Array()
    for (i=0; i<xMax; i++) {
        arr[i] = new Array();
        for (j=0; j<yMax; j++) {
            arr[i][j] = (i+1) * (j+1)
        }
    }
    return arr;
}
var arr = twoDimensionalArray(9, 9);
console.log(arr);

console.log("--------------------排序----------------------")
var srcArr = [];
for (var i=0; i<10; i++) {
    srcArr[i] = parseInt(Math.random() * 1000);
}
console.log("原数组");
console.log(srcArr);

console.log("由小到大");
console.log(srcArr.sort(function(a, b) { return a > b; }));

console.log("由大到小");
console.log(srcArr.sort(function(a, b) { return a < b; }));

console.log("--------------------map reduce----------------------")
console.log(srcArr);
var mapResult = srcArr.map(function(item) {
   return item % 10;
});
console.log("map result:" + mapResult);
var reduceResult = mapResult.reduce(function(a, b) {
    return a + b;
});
console.log("reduceResult:" + reduceResult);