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1. Top results related to when to use a functional programming language?

   • Functional Programming: How to convert an impure function to a pure function when the input needs to be mutated

     Top Answer

     Answered Apr 06, 2020 · 1 votes

     If you want updateNewObject to be pure, have it create a new object that clones the original, mutate that, and then return the new object.

     updateNewObject(condition, oldObject, input, conditionList) { const newObject = {...oldObject}; const i = conditionList.indexOf(input.condition) if(i === 0){ newObject.f1 = [...newObject.f1, input]; } else if(i === 1) { newObject.f2 = [...newObject.f2, input]; } . . . return newObject;}

     Note how newObject.f1 = [...newObject.f1, input]; creates a new array - this ensures that we not only don't mutate the object directly, but we don't mutate any of its fields (arrays) and instead create new ones.

     Then tweak parentFunction so that it uses the value of each returned updateNewObject call:

     parentFunction = (inputs: object[], condtionList: string[]) => {- let newObject = {f1: val1[], f2: val2[], f3: val3[]...} inputs.forEach(input => { if(condition1){ newObject = updateNewObject(condtion1, newObject, input, conditionList) } . . . } return newObject}

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   • When to use a scripting language?

     Top Answer

     Answered Dec 29, 2008 · 34 votes

     You should use a scripting language when speed of development is more important than speed of execution.

     Other Answers

     Answered Dec 29, 2008 · 22 votes

     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 of execution, but is harder to modify (because it must be compiled and reloaded), whereas the scripted part of the system is optimized for flexibility, it will run slower but can be quickly and easily modified by anyone with a text editor.

     You would use this pattern if you wanted to make part of the functionality of your application easy to customize.

     Other Answers

     Answered Dec 29, 2008 · 10 votes

     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
     • Generating a performance graph
     • Data reduction - transforming a text file into a needed format
     • Getting a specific subset of data from a database and packing it as a text file

     All of these can also be done in a compiled language, but for me it is faster and easier to do them in a scripting language (I use ruby, but PERL and python are just fine).

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     2/5

   • When to use assembly language to debug a c/c++ program?

     Top Answer

     Answered Jun 07, 2009 · 7 votes

     It can be very helpful in cases where you can not (yet) reliably reproduce a bug, such as due to heap/stack corruption. You might get one or two core dumps, quite possibly from a customer. Even assuming your debugger is reliable, looking at assembly can tell you exactly which instruction is crashing (and thus which piece of memory is corrupted).

     Furthermore, in my experience (primarily in kernel debugging) the debuggers have been relatively bad at dealing with optimized code. They get things like parameters/etc wrong, and to really tell what's going on I need to look at diassembly.

     If I can reproduce a problem reliably/easily it doesn't tend to be as helpful to deal with disassembly, because I'll get more information from just stepping through the program. On the other hand, getting to the point where you can reproduce a problem is usually more than halfway to fixing it.

     Other Answers

     Answered Dec 29, 2008 · 22 votes

     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 of execution, but is harder to modify (because it must be compiled and reloaded), whereas the scripted part of the system is optimized for flexibility, it will run slower but can be quickly and easily modified by anyone with a text editor.

     You would use this pattern if you wanted to make part of the functionality of your application easy to customize.

     Other Answers

     Answered Dec 29, 2008 · 10 votes

     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
     • Generating a performance graph
     • Data reduction - transforming a text file into a needed format
     • Getting a specific subset of data from a database and packing it as a text file

     All of these can also be done in a compiled language, but for me it is faster and easier to do them in a scripting language (I use ruby, but PERL and python are just fine).

     Check all answers on Stack Overflow

     3/5

   • "Functional programming" has a clear meaning, but does "functional language"?

     Top Answer

     Answered May 23, 2017 · 16 votes

     Among people who study programming languages for a living, "functional programming language" is a pretty weakly bound term. There is a strong consensus that:

     • Any language that calls itself functional must support first-class, nested functions with lexical scoping rules.

     A significant minority also reserve the term "functional language" for languages which are:

     • Pure (or side-effect-free, referentially transparent, see also)

     as in languages like Agda, Clean, Coq, and Haskell.

     Beyond that, what's considered a functional programming language is often a matter of intent, that is, whether is designers want it to be called "functional".

     Perl and Smalltalk are examples of languages that support first-class functions but whose designers don't call them functional. Objective Caml is an example of a language that is called functional even though it has a full object system with inheritance and everything.

     Languages that are called "functional" will tend to have features like the following (taken from Defining point of functional programming):

     • Anonymous functions (lambda expressions)
     • Recursion (more prominent as a result of purity)
     • Programming with expressions rather than statements (again, from purity)
     • Closures
     • Currying / partial application
     • Lazy evaluation
     • Algebraic data types and pattern matching
     • Parametric polymorphism (a.k.a. generics)

     The more a particular programming language has syntax and constructs tailored to making the various programming features listed above easy/painless to express & implement, the more likely someone will label it a "functional language".

     Other Answers

     Answered Dec 29, 2008 · 22 votes

     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 of execution, but is harder to modify (because it must be compiled and reloaded), whereas the scripted part of the system is optimized for flexibility, it will run slower but can be quickly and easily modified by anyone with a text editor.

     You would use this pattern if you wanted to make part of the functionality of your application easy to customize.

     Other Answers

     Answered Dec 29, 2008 · 10 votes

     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
     • Generating a performance graph
     • Data reduction - transforming a text file into a needed format
     • Getting a specific subset of data from a database and packing it as a text file

     All of these can also be done in a compiled language, but for me it is faster and easier to do them in a scripting language (I use ruby, but PERL and python are just fine).

     Check all answers on Stack Overflow

     4/5

   • Spreadsheets that use a functional-programming language

     Top Answer

     Answered Dec 24, 2009 · 13 votes

     Spreadsheets are quite a popular application among functional programmers. They have been a recurring theme in papers over the years. Some of the more memorable papers include

     • Spreadsheet Functional Programming by David Wakeling (2007).
     • Forms/3 by Margaret Burnett and many others (2001)
     • Implementing Function Spreadsheets by Peter Sestoft (2008)

     You can also read about an effort to make Excel more functional.

     For each of these papers I have either read the paper or heard a talk based on the papers. None of the papers is fabulous but all of them are good. I think the one with the most interesting ideas is by Sestoft—and his experimental results are pretty amazing.

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     5/5

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2. stackoverflow.com › questions › 397425When to use a functional programming language ... - Stack ...

   stackoverflow.com › questions › 397425

   For functional programming, this is when the solution to a problem is easily expressed in terms of functions, hence the name. Generally it's good for mathematical operations, AI, pattern matching; in general anything that can be broken down into a set of rules that must be applied to get an answer.

3. learntocodewith.me › learn › functional-programmingWhat Is Functional Programming? Benefits, Uses, & Languages

   learntocodewith.me › learn › functional-programming

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   Jul 7, 2023 · So, what is a functional programming language? 🤔. They are specific programming languages built around the ideas behind functional programming paradigms. A few examples include Haskell, Scala, Clojure, F#, and more (we’ll cover seven of the best functional programming languages in this article).

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4. github.com › readme › guidesFunctional Programming 101 - GitHub

   github.com › readme › guides

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   • What Is Functional Programming?
   • What Are The Rules of Functional Programming?
   • An Example to Show The Difference Between OOP and Functional Programming
   • Why Would I Use Functional Programming?
   • Debugging
   • Reusability
   • Okay, Okay, I’m Sold. How Do I Get started?

   There are three “types” of programming that you may or may not know: procedural programming, object-oriented programming, and functional programming. I’ll focus on the latter two. In object-oriented programming (OOP), you create “objects” (hence the name), which are structures that have data and methods. In functional programming, everything is a f...

   See full list on github.com

   There are two main things you need to know to understand the concept: 1. Data is immutable: If you want to change data, such as an array, you return a new array with the changes, not the original. 2. Functions are stateless: Functions act as if for the first time, every single time! In other words, the function always gives the same return value fo...

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   Let’s say that you have a school and we have the records of each of the students in some database. Let’s say they all have a name and a grade point average (GPA). In object-oriented programming, you might write something like this: If you wanted to initialize a student, you might do something like this: Now let’s say you want to change the GPAs of ...

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   When you think about well-structured software, you might think about software that’s easy to write, easy to debug, and where a lot of it is reusable. That’s functional programming in a nutshell! Granted, one might argue that it’s not as easy to write, but let’s touch on the other two points while you wrap your mind around the functional paradigm. “...

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   Debugging functional programming is arguably significantly easier than other programming paradigms because of its modularity and lack of side effects. If something went wrong in your software using OOP, you would have to think about what other parts of your program might have done previously that could affect your program’s state. With functional p...

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   As you saw in our student example, we broke down the functions into smaller functions. In every functional program you write, you break functions down to be as small as they can be. It’s kind of like breaking up a complex math problem into parenthesis. Let’s say that you want to solve a math problem, like: (6 * 9) / ((4 + 2) + (4 * 3))If you were d...

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   If you’re already comfortable with JavaScript or Python, you can get started right away trying out functional programming concepts like we’ve talked about here. If you’d like to get more into the nitty-gritty of “pure” languages that are designed for functional programming, you can try out the Lisp family (including Common Lisp, Scheme, and Clojure...

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5. en.wikipedia.org › wiki › Functional_programmingFunctional programming - Wikipedia

   en.wikipedia.org › wiki › Functional_programming

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   It is possible to use a functional style of programming in languages that are not traditionally considered functional languages. [97] For example, both D [ 98 ] and Fortran 95 [ 59 ] explicitly support pure functions.

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7. www.freecodecamp.org › news › an-introduction-to-theAn Introduction to the basic principles of Functional Programming

   www.freecodecamp.org › news › an-introduction-to-the

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   Nov 15, 2018 · In this post, I will tell you more about functional programming, and some important concepts, with a lot of code examples. This article uses Clojure as a programming language example to explain Functional Programming.

8. programmingduck.com › articles › functionalFunctional programming – The ultimate beginner’s guide

   programmingduck.com › articles › functional

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   May 4, 2021 · Functional programming is very useful: It results in better, cleaner and more understandable code. It emphasizes small functions, which are easier to understand, reuse and test. (Although, you should already be using small functions, as explained in clean code and programming principles.)

9. People also ask

   What is a functional programming language?

   • A functional programming language is one that treats functions as "first rate citizens". That means that it allows you to pass a function as an argument to another function, return a function as the result of a function call, etc. Basically it allows you to pass functions around as if they were normal variables. For example:

   Functional programming – The ultimate beginner’s guide

   programmingduck.com/articles/functional-programming-introduction

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   Do you need a functional programming language?

   • To do functional programming, you need a functional programming language. You also need to understand closures. A functional programming language is one that treats functions as "first rate citizens".

   Functional programming – The ultimate beginner’s guide

   programmingduck.com/articles/functional-programming-introduction

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   Which programming languages support a functional style?

   • It is possible to use a functional style of programming in languages that are not traditionally considered functional languages. [ 97 ] For example, both D [ 98 ] and Fortran 95 [ 59 ] explicitly support pure functions. JavaScript, Lua, [ 99 ] Python and Go [ 100 ] had first class functions from their inception. [ 101 ]

   Functional programming - Wikipedia

   en.wikipedia.org/wiki/Functional_programming

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   Why is functional programming useful?

   • In some resources, there is no explanation at all for why functional programming is useful. In some other resources, the explanation is very short and vague, such as "pure functions are good", "programs are easier to read", etc. That’s technically true, but it’s difficult for beginners to see how without specific examples.

   Functional programming – The ultimate beginner’s guide

   programmingduck.com/articles/functional-programming-introduction

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10. www.infoworld.com › article › 2263963What is functional programming? A practical guide - InfoWorld

    www.infoworld.com › article › 2263963

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    Apr 1, 2021 · Functional programming seeks to take advantage of language support in using functions as variables, arguments, and return values to create elegant code.