Why is array.push sometimes faster than array[n] = value?

As a side result of testing some code I wrote a small function to compare the speed of using the array.push method vs direct addressing (array[n] = value). To my surprise the push method often showed to be faster especially in Firefox and sometimes in Chrome. Just out of curiosity: anyone has an explanation for it? You can find the test @this page (click 'Array methods comparison') A

为什么array.push有时比array [n] = value更快?

作为测试一些代码的副作用,我编写了一个小函数来比较使用array.push方法与直接寻址(array [n] = value)的速度。 令我惊讶的是推送方法经常表现出更快,特别是在Firefox中,有时在Chrome中。 出于好奇:任何人都有解释吗? 你可以找到test @this页面(点击'Array methods comparison') 各种各样的因素发挥作用,大多数JS实现使用一个平面阵列,如果稍后有必要,它会转换为稀疏存储。 基本上,稀疏的决定是基于

asp.net mvc display ViewBag dictionary to javascript

i'm new in C# asp.net mvc. I'm making a ViewBag that contains Dictionary data type in controller and i want to get and display the value by javascript in .cshtml to code it with googlemaps function. here's my dictionary & viewbag code from the controller: Dictionary<string, string> alamatVehicleMarker = new Dictionary<string, string>(); alamatVehicleMarker.Add("v1"

asp.net mvc将ViewBag字典显示为javascript

我是C#asp.net mvc中的新成员。 我正在制作一个ViewBag,其中包含控制器中的Dictionary数据类型,我想通过.cshtml中的javascript获取并显示值,以便用googlemaps函数对其进行编码。 这里是我的控制器字典和视图代码: Dictionary<string, string> alamatVehicleMarker = new Dictionary<string, string>(); alamatVehicleMarker.Add("v1","Bali"); alamatVehicleMarker.Add("v2","Jakarta"); alamatVehicleMarke

How to debug a Gruntfile with breakpoints using node

So I have spent the past couple days trying to get this to work with no luck. Most of the solutions I have found seem to work "okay" for debugging node applications. But I haven't had much luck debugging grunt stand alone. I would like to be able to set breakpoints in my gruntfile and either step through the code with either the browser or an IDE. I have tried the following:

如何使用节点调试带有断点的Gruntfile

所以我花了几天时间试图让这个工作没有运气。 我发现的大多数解决方案似乎对于调试节点应用程序“很好”。 但是我没有太多的运气调试咕噜声。 我希望能够在gruntfile中设置断点,并通过浏览器或IDE浏览代码。 我已经尝试了以下内容: 使用intelliJ IDE进行调试使用Grunt控制台(处理结束,退出代码为6) 使用Nodeeclipse进行调试(这种工作方式没问题,但不会在eclipse中设置断点,不太直观) 使用node-inspector进行调

Where to put model data and behaviour?

I am working with AngularJS for my latest project. In the documentation and tutorials all model data is put into the controller scope. I understand that is has to be there to be available for the controller and thus within the corresponding views. However I dont think the model should actually be implemented there. It might be complex and have private attributes for example. Furthermore one

模型数据和行为的放置位置?

我正在与AngularJS合作进行我的最新项目。 在文档和教程中,所有模型数据都放入控制器范围。 我明白,必须在那里为控制器提供,并因此在相应的观点内。 但是我不认为模型应该在那里实际实施。 例如,它可能很复杂并且具有私有属性。 此外,人们可能希望在另一个上下文/应用程序中重用它。 把所有东西都放进控制器完全打破了MVC模式。 对于任何模型的行为也是如此。 如果我将使用DCI体系结构并从数据模型中分离行为,则

Simple Object vs. Factory vs. Constructor

There are three ways of creating objects in JavaScript: by simple Object creating by Factory function by Constructor function Simple Object Creation: var ronaldo = { name: "Ronaldo", age: "35", quote: "Hi I am Ronaldo", salary: function(x){ return x+2500; } }; Factory Function: function human(x,y,z,i){ return{ name: x, age: y, quote: z,

简单对象与工厂与构造函数的比较

有三种在JavaScript中创建对象的方法: 通过简单的对象创建 由工厂功能 通过构造函数 简单的对象创建: var ronaldo = { name: "Ronaldo", age: "35", quote: "Hi I am Ronaldo", salary: function(x){ return x+2500; } }; 工厂功能: function human(x,y,z,i){ return{ name: x, age: y, quote: z, salary: function(i){ return i+2500; } } }; var Zini

Redux reducer / state

I enjoy the concept of reducer composition in Redux, but have run into a scenario where I would like to split a reducer up, but the children reducers would then rely on state-slices from the others to make their changes. For Example In my state, I need to keep track of the following: A range of possible ranks (ie [ 2, 3, 4, 5, 6 ] ) The currently selected rank (one of the above values).

Redux减速器/状态

我喜欢Redux中reducer构成的概念,但遇到了我想分割reducer的场景,但儿童reducer将依赖其他人的state-slice来进行修改。 例如 在我的状态下,我需要跟踪以下内容: 一系列可能的等级 (即[ 2, 3, 4, 5, 6 ] ) 当前选定的排名 (以上值之一)。 取决于选定的排名 ,可能的训练水平的范围。 关系是范围从[ 1 .. (selectedRank - 1) ] 目前选定的培训级别在上述范围内 起初,我有一个更大的减速器,它封装了所有这

Draw lines between markers in leaflet

I'm trying to insert lines between markers (which are generated from JSON data) in leaflet. I saw an example, but it doesn't work with JSON data. I can see the markers, but no lines appear. var style = { color: 'red', fillColor: "#ff7800", opacity: 1.0, fillOpacity: 0.8, weight: 2 }; $.getJSON('./server?id_dispositivo=' + id_device + '', function(data) { window.geojson = L

在小册子中的标记之间绘制线条

我试图在小册子中插入标记(从JSON数据生成)之间的行。 我看到一个例子,但它不适用于JSON数据。 我可以看到标记,但不显示任何线条。 var style = { color: 'red', fillColor: "#ff7800", opacity: 1.0, fillOpacity: 0.8, weight: 2 }; $.getJSON('./server?id_dispositivo=' + id_device + '', function(data) { window.geojson = L.geoJson(data, { onEachFeature: function (feature, layer) { v

this vs prototype Javascript

This question already has an answer here: How does JavaScript .prototype work? 21 answers I'm going to try to guess/address your actual concerns. See the following code snippet: function A() { this.text = "hello"; } var a = new A(); a.text = "hello world"; Actually there's only a difference between setting text property inside the constructor (ie this.text ) function or once

这与原型Javascript

这个问题在这里已经有了答案: JavaScript .prototype如何工作? 21个答案 我将尝试猜测/解决你的实际问题。 请参阅以下代码片段: function A() { this.text = "hello"; } var a = new A(); a.text = "hello world"; 实际上,在构造函数(例如this.text )函数内设置text属性或者一旦对象已经创建(即a.text )之间只有区别。 基本上, this构造函数内的是被创建的对象与a变量是已创建的对象。 两者之间的唯一

Understanding Prototype and this

This question already has an answer here: How does JavaScript .prototype work? 21 answers In JavaScript it's all about whether you instantiate or merely invoke a function. It's a constructor only in cases of the former. The difference, as you probably know already, is whether the new keyword is used before the function reference. It's this that controls what those properties

了解原型和这个

这个问题在这里已经有了答案: JavaScript .prototype如何工作? 21个答案 在JavaScript中,所有关于你是实例化还是仅仅调用一个函数。 只有在前者的情况下,它才是构造者。 正如您可能已经知道的,不同之处在于是否在函数引用之前使用了new关键字。 这是控制你的构造函数中的属性是属性的东西 。 所以在你的情况下,它们不是构造函数的属性(这是对它们进行思考的一种无益的方式); 相反,它们是您的实例的属性 。

Visibility of prototype property of a function vs. object on console

This question already has an answer here: [[Prototype]] vs prototype: ..what is the difference? (MyCons.__proto__ === MyCons.prototype) equals FALSE 2 answers How does JavaScript .prototype work? 21 answers The property named .prototype is a property of a constructor function only. It is stored elsewhere for an actual object instance and is not accessible as .prototype there. In modern

控制台上功能与对象的原型属性的可见性

这个问题在这里已经有了答案: [[Prototype]] vs原型:..有什么区别? (MyCons .__ proto__ === MyCons.prototype)等于FALSE 2答案 JavaScript .prototype如何工作? 21个答案 名为.prototype的属性只是构造函数的一个属性。 它存储在其他地方用于实际的对象实例,并且不能以.prototype访问。 在现代浏览器中,可以使用Object.getPrototypeOf(obj)来获取对象实例的原型。 详情请参阅MDN。 在一些较旧的浏览器中