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1. Top results related to what are the function of dictionary in javascript

   • What is the function of the the double parentNode in Javascript?

     Top Answer

     Answered Jun 26, 2021 · 0 votes

     element.parentNode => parentNode 2 element.parentNode.parentNode => parentNode 1

     element.parentNode.parentNode.removeChild => [parentNode 1].renoveChild //pseudo code

     element.parentNode.parentNode.removeChild(element.parentNode) => [parentNode 1].renoveChild([parentNode 2]) //pseudo code

     So parentNode 2 will be removed along with all it's children

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     1/5

   • What are all the differences between function and constructor function in JavaScript?

     Top Answer

     Answered Aug 23, 2017 · 54 votes

     A constructor function is a normal function.

     What makes the difference here is the use of the new operator which makes the context (this) in the function the new instance, thus letting it take the two properties, and returns this new instance.

     Without the new operator, the context would have been the external one (window if your code is in the global scope in loose mode, undefined if in strict mode).

     That is, if you omit the new

     var catC = Cat("Fluffy", "White");-

     the function "works" (if you're not in strict mode) but you have two different results :

     • catC is undefined as your function returns nothing
     • name and color are now properties of the external scope

     The whole magic, thus, is in the new operator :

     When the code new foo(...) is executed, the following things happen:

     A new object is created, inheriting from foo.prototype.

     The constructor function foo is called with the specified arguments and this bound to the newly created object. new foo is equivalent to new foo(), i.e. if no argument list is specified, foo is called without arguments.

     The object returned by the constructor function becomes the result of the whole new expression. If the constructor function doesn't explicitly return an object, the object created in step 1 is used instead. (Normally constructors don't return a value, but they can choose to do so if they want to override the normal object creation process.)

     When I said it's a normal function I, I omitted one thing : the intent of the developer. You usually define functions to be either called as constructors (i.e. with new) or not. In the first case you most often use the arguments to initialize the fields of the instance (using this.name = ...) and you often follow by adding functions to the prototype (as you did) so that they become available for all instances. And to make your intent clear, it's customary to name your constructor starting with an uppercase letter.

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     2/5

   • What are the benefits and drawbacks of using the 'this' keyword in a constructor function over the prototype property?

     Top Answer

     Answered May 23, 2017 · 2 votes

     I'm wondering if this is the correct way of imagining what's taking place

     Yes.

     Why would anyone choose one method over another?

     • values are shared amongst all instances
     • therefore takes less memory and is faster: Defining methods via prototype vs using this in the constructor - really a performance difference?

     This is especially beneficial for methods (with their dynamic this binding)

     • values are specific to each instance
     • methods defined there are closure which have access to the constructor scope and therefore allows true privacy.

     The own properties are necessary for the data that distinguishes the instances.

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     3/5

   • What are the types of Popup box available in JavaScript ?

     In Javascript, popup boxes are used to display the message or notification to the user.

     There are three types of pop-up boxes in JavaScript:

     Table of Content

     • Alert Box
     • Prompt Box
     • Confirm Box

     Alert Box

     It is used when a warning message is needed to be produced. When the alert box is displayed to the user, the user needs to press ok and proceed.

     alert("your Alert here");

     Example: This example shows the implementation of the alert box.

     HTML

     <!DOCTYPE html><html><head>    <title>Pop-up Box type | Alert Box</title>    <style>        h1{            color:green;        }    </style></head> <body>    <center>        <h1>GeeksforGeeks</h1>         <h3>Alert Box</h3>        <button onclick="geekAlert()">            Click here for alert box        </button>                 <!-- Alert box function -->        <script>            function geekAlert() {                alert("An Online Computer Science"                            + "Portal for Geeks");            }        </script>    </center> </body></html>-

     Output: 

     Output

     Prompt Box...

     Check all answers on Geeksforgeeks

     4/5

   • What are the Equivalent of printf/String.Format in JavaScript ?

     JavaScript is a popular programming language that is used to create interactive and dynamic web pages. When working with JavaScript, developers often need to format strings to display data in a specific way. The printf function and the String.Format() methods are two popular string formatting tools in other programming languages, but JavaScript does not have a built-in equivalent. However, there are several approaches to achieving the same functionality in JavaScript.

     Approaches: To use printf or String.Format in other programming languages, you need to include the necessary library or module. However, JavaScript doesn’t have a built-in function that is equivalent to printf or String.Format. There are several approaches to achieving printf or String.Format functionality in JavaScript. Here are some approaches you can use:

     1. Using console.log() Method: JavaScript provides the console.log() method for printing the value of variables and expressions to the console. This method is often used for debugging and testing purposes, but it can also be used for printing strings and integers in a specific format, similar to the printf() function in other programming languages.

      

     Syntax:

     console.log()

     Example:

     Javascript

     const name = 'Geek'; const age 14...

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2. devforum.roblox.com › t › userinput-and-tweenserviceUserinput and Tweenservice issue [REPOST] - Roblox

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   21 hours ago · Recently, i’ve been creating tweens based on certian key inputs which are based on the Piano Key Order. My issue encounters in the inputEnded function. Explanation While pressing lowercase notes if you press SHIFT and release it at the right moment, this issue will encounter. Making the upper key (shifted key), constantly be the incorrect color. Same goes for opposite and for CTRL Issues The ...

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4. www.geeksforgeeks.org › radarWhat is Radar System ? | Working Principles & Applications

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8. doc.coder100.com › index › indexdictionary的用法.doc 码农集市文档下载平台

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   21 hours ago · Dictionary<string,string>是一个泛型他本身有集合的功能有时候可以把它看成数组他的结构是这样的：Dictionary<[ ...

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   21 hours ago · JavaScript 解析器在运行 JavaScript 代码的时候分为两步：预解析和代码执行。 预解析：js引擎会把js里面所有的 var 还有 function 提升到当前作用域的最前面. 代码执行：从上到下执行JS语句. 预解析只会发生在通过 var 定义的变量和 function 上。