object

What is an object in Objective-C?

杀马特。学长 韩版系。学妹 提交于 2020-01-04 06:14:06
问题 I thought I had a pretty good idea of what an object is.. but I was wrong. Could anyone explain what an object is? Or how I should think of it when programming? Please help me understand. I know it's not the pointer .. so what exactly is the object in a line of code .. 回答1: Conceptually in OOP, an object is a certain instance of a class. A class defines the information and actions for a certain type of object. The quintessential example is of a Car class, that maybe holds a "colour" property

V8 JavaScript Object vs Binary Tree

北城余情 提交于 2020-01-04 06:09:39
问题 Is there a faster way to search data in JavaScript (specifically on V8 via node.js , but without c/c++ modules) than using the JavaScript Object ? This may be outdated but it suggests a new class is dynamically generated for every single property. Which made me wonder if a binary tree implementation might be faster, however this does not appear to be the case. The binary tree implementation isn't well balanced so it might get better with balancing (only the first 26 values are roughly

Unity; Random Object Movement [closed]

会有一股神秘感。 提交于 2020-01-04 06:09:11
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . I am making a robot battling game where I want the enemy to randomly move and then sometimes travel towards the enemy. Code that I want the movement to be in. else if (avoid == false) { transform.LookAt(target); transform.Translate(Vector3.forward * Time.deltaTime * movementSpeed)

IN javascript,why {}!==Object()?

别说谁变了你拦得住时间么 提交于 2020-01-04 05:54:22
问题 Given var o = {}; var p = new Object(); p === o; //false o.__proto__===p.__proto__ // true why is this false? please tell me the immediate reason to return false?? 回答1: The === for objects is defined as: 11.9.6 The Strict Equality Comparison Algorithm The comparison x === y , where x and y are values, produces true or false . Such a comparison is performed as follows: ... 7. Return true if x and y refer to the same object. Otherwise, return false . In this case, although both are empty

c# object to string to display it in text format

别说谁变了你拦得住时间么 提交于 2020-01-04 05:53:29
问题 I have the next object/list "ListaDatos" and I like to get it as clear string (to visualize/send this via mail, etc) public List<Datos> ListaDatos = new List<Datos>(); public class Datos { public string Numero; public string Alias; public string URLConsumo; //-- Consumos ----------------------------- public List<Consumo> Consumos = new List<Consumo>(); public string ConsumoTotal; } public class Consumo { public string Tipo; public string Subtipo; public string Concepto; public string Cantidad

Different object and reference

℡╲_俬逩灬. 提交于 2020-01-04 05:47:09
问题 I was trying to learn Java from Tutorials Point. So, may be this question would be so basic. But I am really stuck here. And I don't know what to google to get it resolved. Please have a look at this program. class Animal{ public void move(){ System.out.println("Animals can move"); } } class Dog extends Animal{ public void move(){ System.out.println("Dogs can walk and run"); } } public class TestDog{ public static void main(String args[]){ Animal a = new Animal(); Animal b = new Dog(); a.move

java强制类型转换

风格不统一 提交于 2020-01-04 05:44:31
在 Java 项目的实际开发和应用中,常常需要用到将对象转为String这一基本功能。本文将对常用的转换方法进行一个总结。常用的方法有Object.toString(),(String)要转换的对象,String.valueOf(Object)等。下面对这些方法一一进行分析。 方法1:采用 Object.toString()方法 请看下面的例子: 1 Object object = getObject();2 System.out.println(object.toString()); 注1 在这种使用方法中,因为java.lang.Object类里已有public方法.toString(),所以对任何严格意义上的java对象都可以调 用此方法。但在使用时要注意,必须保证object不是null值,否则将抛出NullPointerException异常。采用这种方法时,通常派生类会覆盖Object里的toString()方法。 方法2:采用类型转换(String)object方法 这是标准的类型转换,将object转成String类型的值。使用这种方法时,需要注意的是类型必须能转成String类型。因此最好用instanceof做个类型检查,以判断是否可以转换。否则容易抛出CalssCastException异常。此外,需特别小心的是因定义为Object

js对象的深度克隆

亡梦爱人 提交于 2020-01-04 05:40:44
在聊JavaScript(以下简称js)深度克隆之前,我们先来了解一下js中对象的组成。 在 js 中一切实例皆是对象,具体分为 原始类型 和 合成类型 : 原始类型 对象指的是 Undefined 、 Null 、 Boolean 、 Number 和 String ,按值传递。 合成类型 对象指的是 array 、 object 以及 function ,按址传递,传递的时候是内存中的地址。 克隆或者拷贝分为2种: 浅度克隆 、 深度克隆 。 浅度克隆 :基本类型为值传递,对象仍为引用传递。 深度克隆 :所有元素或属性均完全克隆,并于原引用类型完全独立,即,在后面修改对象的属性的时候,原对象不会被修改。 又或许你刚听说“深度克隆”这个词,简单来说,就是说有个变量a,a的值是个对象(包括基本数据类型),现在你要创建一个变量b,使得它拥有跟a一样的方法和属性等等。但是a和b之间不能相互影响,即a的值的改变不影响b值的变化。直接赋值可好? var a = 1; var b = a; a = 10; console.log(b); // 1 var a = 'hello'; var b = a; a = 'world'; console.log(b); // hello var a = true; var b = a; a = false; console.log(b); //

js之深浅克隆

混江龙づ霸主 提交于 2020-01-04 05:38:48
1、克隆的概念   浅度克隆:原始类型为值传递,对象类型仍为引用传递。   深度克隆:所有元素或属性均完全复制,与原对象完全脱离,也就是说所有对于新对象的修改都不会反映到原对象中。 2. //数值克隆的表现 var a="1"; var b=a; b="2"; console.log(a);// "1" console.log(b);// "2" //字符串克隆的表现 var c="1"; var d=c; d="2"; console.log(c);// "1" console.log(d);// "2" //字符串克隆的表现 var x=true; var y=x; y=false; console.log(x);// true console.log(y);// false//对象类型 var m=function(){alert(1);}; var n=m; n=function(){alert(2);}; console.log(m());//1 console.log(n());//2经过对象克隆以后,我修改oNew的地址,发现原对象oPerson也被修改了。这说明对象的克隆不够彻底,那也就是说深度克隆失败! 3、深克隆的实现   为了保证对象的所有属性都被复制到,我们必须知道如果for循环以后,得到的元素仍是Object或者Array,那么需要再次循环

Merging objects within an array and keeping the highest value for identical properties

↘锁芯ラ 提交于 2020-01-04 05:31:12
问题 I have this array and I would like to merge the objects within it. [null, null, {"1":1},{"2":1},{"3":1},{"2":2},{"5":1}] I thought about using something like this: var o1 = { a: 1, b: 1, c: 1 }; var o2 = { b: 2, c: 2 }; var o3 = { c: 3 }; var obj = Object.assign({}, o1, o2, o3); console.log(obj); // { a: 1, b: 2, c: 3 } However, the properties are overwritten by other objects that have the same properties later in the parameters order What I want is to keep the highest value available for the