let array = [1, 2, 3, 4];functionemptyArray() { array = [];}emptyArray(); 但是,这有一个效率更高的方法来清空副本。你可以这样写: let array = [1, 2, 3, 4];functionemptyArray() { array.length = 0;}emptyArray(); 拍平多维矩阵 使用...运算符,将多维尺寸拍平: const arr = [1...
console.log(example(arr,'age'));//object: {18: Array(3), 19: Array(2), 20: Array(2)}18: Array(3)0: {name: "小孙", age: 18, score: 60, weight: 60}1: {name: "小李", age: 18, score: 60, weight: 70}2: {name: "小赵", age: 18, score: 60, weight: 60}19: Arr...
我无法在您的代码中找到错误,但找到了另一种方法来执行您正在寻找的操作: //The algorithm public static int[][] algorithm(int[][] tempArr){ // create the empty array. int[][] modifiedArr = new int[tempArr.length][tempArr[0].length]; for (int i = 0; i < modifiedArr.length; i++...
If a predicate function does not return a truthy value for any array element, the method returns an empty array. function predicate( v ) { return ( v >= 10 ); } var arr1 = new Uint32Array( [ 1, 2, 3 ] ); var arr2 = arr1.filter( predicate ); // returns <Uint32Array>[]...
isType(a) // "Array" 但是,很多时候我们在处理数据的时候,需要判断一个对象是否为{}: var isEmptyObject = function(obj) { for (var name in obj) { return false; } return true; }; isEmptyObject({}); // true isEmptyObject({name: 'xzavier'}); //false ...
array.concat(98) // returns [4, 10, 20, 37, 45, 98] 复制代码 1. 2. 3. 4. 5. 6. 算法: 将num插入arr。 将arr进行升序排序。 返回num的索引。 代码: function getIndexToIns(arr, num) { // Insert num into arr, creating a new array. ...
function isEmpty(obj) { return Reflect.ownKeys(obj).length === 0 && obj.constructor === Object; } 1. 2. 3. 12.克隆数组 let arr = [25, 7.145, 7.2, 120, 40, 56]; const clone = (arr) => arr.slice(0); const clone = (arr) => [...arr]; ...
nconf.js 是一款对文件,环境变量,命令行参数和元素对象合并进行分层的配置工具 暂无标签 https://www.oschina.net/p/nconf-js JavaScript MIT 发行版 暂无发行版 贡献者 (74) 全部 近期动态 4年多前创建了仓库北京奥思研工智能科技有限公司版权所有 Git 大全 Git 命令学习 CopyCat 代码克隆检测 APP...
$.fn.empty = function(){ return this.each(function(){ this.innerHTML = '' }) }$.grep v1.0+ $.grep(items, function(item){ ... }) ⇒ array Get a new array containing only the items for which the callback function returned true.$...
A value such as['mango', 'pineapple']is an array type, but in JS an array type can also be considered akind of object, and akind of truthyvalue. An empty string""is a string typebut also akind of falsyvalue, and even though everything or almost everything is an object in JS, ...