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1. Top results related to why do we need scripting%3f

   • Why do we need a Unit Vector (in other words, why do we need to normalize vectors)?

     Top Answer

     Answered Feb 21, 2010 · 33 votes

     You don't have to normalize vectors, but it makes a lot of equations a little simpler when you do. It could also make API's smaller: any form of standardization has the potential to reduce the number of functions necessary.

     Here's a simple example. Suppose you want to find the angle between two vectors u and v. If they are unit vectors, the angle is just arccos(uv). If they're not unit vectors, the angle is arccos(uv/(|u| |v|)). In that case, you end up computing the norms of u and v anyway.

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     1/5

   • why do we need to import React from "react" in the file having extension .jsx? it seems there is no difference between the .jsx and .js extensions.?

     Top Answer

     Answered Jun 07, 2023 · 0 votes

     This is because JSX is included in the react library, it won't work if you don't have import React from 'react' at the top of your file. Creating a file with a jsx or tsx extension does only define what content will be inside the file and helps your IDE provide file icons, syntax highlighting etc.

     Interesting Fact

     Some frameworks like Next.js do this automatically and you are not required to import react at all, Next.js even defines the type react as an UMD global so you do not need to separately import type definitions.

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     2/5

   • Why do we need a pointer to a class if we can instantiate an object of it and access members of the class?

     Top Answer

     Answered May 23, 2017 · 11 votes

     You might not need a pointer to a class. If your class is small, doesn't exhibit polymorphic behavior through a base class, or cost anything to instantiate, you can probably just rip one off on-the-fly and be done.

     But in many cases, we need pointers because:

     • The class is "big," as in, is expensive to instantiate or make copies of. In that case, we can pass around pointers instead of just creating them as-needed in order to be more efficient with RAM and CPU.
     • You may not want there to be more than once instance of a class. Consider a logger, which is often implemented as a Singleton. Now Singletons are "Bad" according to many, but the use illustrates the point that sometimes instantiating a second copy of some class could break something. So you need a pointer (or reference) to the one-and-only copy.
     • When you want run-time polymorphic behavior, you almost certainly want a pointer (or, preferably, a reference).

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   • Why do we need to define static variables of a class, but we don't define static variables when they are inside functions?

     Top Answer

     Answered Jul 20, 2021 · 5 votes

     The static member variable instance declared inside class Singleton in Code 1 is a class variable.

     This means that regardless of the state of different instances of class Singleton, the state of static variable will remain the same for all objects/instances of that particular class. Hence, it needs to be defined outside the class. (Just like a global variable which is available to function of all scopes.). A single copy of static member variable is allocated in memory even if you don't create any instance. Their definition persists through the entire file.

     In Code 2, the static variable instance is not a class variable but is simply a local variable inside a static member function. Hence there is no need for it to be defined outside since its scope is limited only to static Singleton &GetInstance() function.

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     4/5

   • Why do we need to use threads for running Kafka consumers? And how many threads do we need?

     Top Answer

     Answered Jul 17, 2020 · 1 votes

     What are the benefits of using a thread for running the consumer? I (I thought Kafka abstracts the distribution of load across consumers anyways)

     As you can see, the consumer starts an infinite loop in the run method. Starting it as a new thread lets you do more things in the main thread while the consumer is already active.

     When we use Thread myThread = new Thread(myConsumerRunnable); does that run in a > single thread or across multiple threads?

     Creating the Thread object does not start the new thread yet. It's myThread.start(); where the new thread starts execution. Your example program has a main thread and a consumer thread. The main thread actually waits for the shutdown signal through the CountDownLatch latch, so arguably it would have been possible to avoid the consumer thread.

     Why do we fire the shutdown hook via a separate thread? (To my understanding from inspecting the method, it seems more like a Java thing than a Kafka thing)

     It's a java thing. The shutdown hook thread is not actually executed until shutdown happens. See https://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#addShutdownHook(java.lang.Thread)

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     5/5

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2. stackoverflow.com › questions › 41380916html - the use of `%3F` in URL - Stack Overflow

   stackoverflow.com › questions › 41380916

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   Dec 29, 2016 · While moving a website - that I did not build - I have run into the use of %3F. %3F is the percent-encoded version of ?. It seems to be used like this a lot: <ahref="example%3Flang=1.html">Example</a> when linking to a file named example_lang=1.html. So, I replaced %3F with _, and all works again. I am missing something here. The old website ...

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4. www.coursera.org › articles › scripting-languageWhat Are Scripting Languages? (And Why Should I Learn One?)

   www.coursera.org › articles › scripting-language

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   Nov 29, 2023 · Scripting languages can be an effective tool for programmers, engineers, and other developers to create systems and software. Learning a scripting language is an excellent introduction to coding and programming. They are relatively easy to learn and can be an effective jumping-off point to pursue your hobbies or career interests further.

5. askleo.com › what_is_javascript_and_why_do_i_need_itWhat Is JavaScript and Why Do I Need It? - Ask Leo!

   askleo.com › what_is_javascript_and_why_do_i_need_it

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   Jul 15, 2023 · Programs do everything. Anything that happens on your computer happens because some kind of program tells your computer to do it. In fact, quite often it’s some kind of program telling some other kind of program to do it. It can get quite complicated, as you can imagine. Take webpages, for example.

6. People also ask

   Why should I choose a scripting language?

   • This answer is way off base. 1) The reason to choose a scripting language is when you want a weakly typed programming language over a strongly typed programming language. 2) Language has nothing to do with performance, the compiler does. Scripting languages can be compiled into run time instructions. Depends on the developer.

   When to use a scripting language? - Stack Overflow

   stackoverflow.com/questions/397418/when-to-use-a-scripting-language

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   What is a scripting language?

   • Scripting languages are a type of programming language that is interpreted rather than requiring compilation. These are languages designed for specific runtime environments to provide additional functions, integrate complex systems, and communicate with other programming languages.

   What Are Scripting Languages? (And Why Should I Learn One?)

   www.coursera.org/articles/scripting-language

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   What are the pros and cons of learning a scripting language?

   • One of the pros of learning a scripting language is that these open-source languages are easy to learn, simple to work with, and relatively fast to develop, making this a good starting point even if you have no previous experience. If you're interested in going into coding professionally, it helps to have some basic skills, including:

   What Are Scripting Languages? (And Why Should I Learn One?)

   www.coursera.org/articles/scripting-language

   See all results for this question

   Is it hard to develop a scripting language?

   • Scripting languages are easy so develop but sometimes they are hard do maintenance, especially when the script should run under different platforms (operating systems). You can give the user (or customer) the possibility to change something in your script by himself.

   When to use a scripting language? - Stack Overflow

   stackoverflow.com/questions/397418/when-to-use-a-scripting-language

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7. stackoverflow.com › questions › 397418When to use a scripting language? - Stack Overflow

   stackoverflow.com › questions › 397418

   • Cached

   Nov 21, 2011 · This answer is way off base. 1) The reason to choose a scripting language is when you want a weakly typed programming language over a strongly typed programming language. 2) Language has nothing to do with performance, the compiler does. Scripting languages can be compiled into run time instructions. – Zombies.

   • You should use a scripting language when speed of development is more important than speed of execution.
   • Adding a scripting language as a component of a larger compiled system is a common pattern: the compiled part of the system is optimized for speed...
   • This is slightly a religious issue. I use a scripting language for ad-hoc tasks, such as: looking for a specific item in a ten-thousand lines log....
   • I tend to use scripting languages for rapid prototyping, experimentation, and data wrangling. For example if I have a bunch of text files that I ne...
   • Here's my hierarchy: Try it using grep. If you can't do it with grep, use sed. If sed isn't powerful enough, use awk. If awk isn't powerful eno...
   • I find scripting languages very useful obviously when there's a specific task that fits the language's strengths (i.e. string processing with perl,...
   • I dont't think theres a general rule when to use a scripting language. Scripting languages are easy so develop but sometimes they are hard do maint...
   • I use scripting language to mine data and feed them to database as a cron job. It's easier because i can easily set them using windows scheduler or...
   • Use a scripting language when interactive operation is important, e.g. a command-line shell, or you are exporting functionality for other users to...
   • Scripting language if you plan on either writing once, or keeping it simple. A strongly typed language is much better once your project becomes lar...

8. blog.hubspot.com › website › what-is-javascriptWhat Is JavaScript & Why Is It Important? - HubSpot Blog

   blog.hubspot.com › website › what-is-javascript

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   Mar 7, 2022 · JavaScript is a powerful and versatile programming language that can enhance the functionality and interactivity of websites. In this blog post, you will learn what JavaScript is, why it is important, and how it can benefit your web development projects. You will also find out how it differs from Java, another popular programming language.

9. www.coursera.org › ca › articlesWhat Are Scripting Languages? (And Why Should I Learn One)

   www.coursera.org › ca › articles

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   Jan 26, 2024 · Scripting languages are used in: System administration. Multimedia and games. Web applications on the server and client-side. Report generation. Document and text processing. Writing plugins and extensions for existing programs and applications like Firefox. Different scripting languages have different capabilities.

10. www.coursera.org › in › articlesWhat Are Scripting Languages? (And Why Should I Learn One?)

    www.coursera.org › in › articles

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    Jan 17, 2024 · Programming languages allow coders to communicate with computers using compiled languages—source code compiled to convert into machine code. Scripting languages are a type of programming language. They are interpreted rather than requiring compilation. These are languages designed for specific runtime environments to provide additional ...