Function is a block of code which performs a specific task.

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Use of malloc in C

Is it necessary to call free function every time we use malloc in C. I am asking this because I have seen many times that it is not called . Thank you
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1answer
213 views

static or non-static, that is the question? [duplicate]

For comparisons / evaluations of objects of the same class(and other purposes), is it better to define a static or a non-static (is this called "dynamic" by chance?) function? Sample code: class ...
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0answers
45 views

Is it possible to make a MS-SQL Scalar function do this? [migrated]

I have a 3rd party application that can call a MS-SQL scalar function to return some summary information from a table. I was able to return the summary values with a table-valued function, but the ...
1
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2answers
175 views

What is the concept behind writing a cancel operation in c++? [closed]

I'm attempting to write a cancel operation for a software download application. This application will first transfer the software to the device and then install the software on it. (These are givens ...
0
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3answers
122 views

Writing a method to 'transform' an immutable object: how should I approach this?

(While this question has to do with a concrete coding dilemma, it's mostly about what's the best way to design a function.) I'm writing a method that should take two Color objects, and gradually ...
4
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2answers
245 views

Why are there no function pointers in Java? [closed]

Lately I started studying about different interesting concepts that exist in languages other than Java. Since the only language I've ever programmed with is Java, a lot of these concepts are very new ...
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3answers
105 views

Reason to treat internal class variables and functions inside a class as “separate” entities

Note: there is a similar question that addresses my subject: Better style for member variables? ... but that question does not address "dealing with large legacy code base and comprehension of ...
1
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0answers
66 views

Use Generic of Specific Function names for similar objects

Is there a school of thought on putting focus on using generic names for functions, opposed to naming functions based on the things they do? Example Say we have a Bill / Price Sheet object, that has ...
5
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6answers
552 views

Are closures considered impure functional style?

I have a few related questions on closures: Are closures considered impure in functional programming? It seems one can generally avoid closures by passing values directly to a function. Therefore ...
0
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1answer
121 views

design patterns in Javascript - toggle functionality [duplicate]

My goal is to add some functionality to the bxslider script - in this case, I want to be able to enable/disable a keyboard event handler AFTER a slider is instantiated. I guess this code is self ...
2
votes
1answer
81 views

How to simplify unit testing with higher order functions?

this is not a question on how to write unit tests this is not a question on what to test this is a question on reducing the typing needed overall for a personal testing framework I know you can ...
2
votes
4answers
102 views

To make a class function or not?

I'm wondering about functions used like this: object1->objectMethod1(arg1, arg2); if objectMethod1: - does not change the object state - does not use the object's state at all - is used by the ...
2
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3answers
132 views

Using past participle for non-altering functions [closed]

I often have naming problems when I write classes and functions. Generally speaking, I try to follow the following set of rules if I have to deal with a function whose name is a verb: If the ...
1
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3answers
210 views

Does designing a method that changes the argument's (if was object) values a good practice?

The premise is using a language (e.g. C#, javascript) which passes an object by reference into a method. Assume there is an object "Player" which has a property "Level" and there is a method takes ...
4
votes
1answer
191 views

Passing a Scala function to a Java 8 method

The following Scala code works and can be passed to a Java method expecting a function. Is there a cleaner way to do this? Here's my first pass: val plusOne = new ...
0
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3answers
101 views

Long vs short scripts? Big vs small scripts? [closed]

As a programmer, I have always wondered whether it is preferable to write (a) short modular functions that are each stored in their own script (i.e., file) or (b) long comprehensive scripts that ...
-1
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4answers
244 views

(Is there | Why isn't there) a programming language that allows 'inline' arguments to a function? [duplicate]

What is the reason for 'trailing' arguments to functions in most programming languages? That is, we do something like this: def subtract(x, y): return x - y subtract(10, 5) ...rather than the ...
2
votes
6answers
759 views

An alternative to an array of functions?

I'm programming an app (php) which requires a very long list of similar yet different functions, which are being called by a set of keys: $functions = [ "do this" => function() { // ...
2
votes
2answers
280 views

Why function returning by Address can not be a Lvalue?

Why it is not possible to make it LValue if a function return by address (while possible in case of reference)? int* returnByAdress() { int x =20; return &x; } int& ...
0
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2answers
925 views

When to use functions vs methods?

So I know that methods are more OOP than functions. I was wondering if someone could show me an example of a function and a method and explain the differences between methods and functions to me? ...
1
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3answers
774 views

If statements vs switch cases? in a JavaScript game and if to use a function [duplicate]

I am developing a game in JavaScript where you start with a user input, stored in the variable "controller". The options for the user consists of start to start the game or about to learn about the ...
5
votes
2answers
124 views

Should more than one function be used when they do similar, but not identical things?

For example, if I wanted to generate some HTML based on some input. Which is the preferred way out of: <?php function generate_html($type, $input){ switch($type){ case 'paragraph': ...
6
votes
6answers
453 views

Why do many languages not support named parameters? [closed]

I was just thinking how much easier it would be to read code if, when calling a function, you could write: doFunction(param1=something, param2=somethingElse); I can't think of any drawbacks and it ...
1
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1answer
113 views

Helper functions - well defined inputs or well defined outputs?

Problem In Codeigniter (PHP framework), I am trying to create a helper function that will inject an ActiveRecord (for MySQL) command into a chain of existing ActiveRecord calls. The reasoning for ...
1
vote
2answers
207 views

Using Functions for Never-Repeated Code [duplicate]

What are some best practices for using functions to break up large blocks of code into discrete chunks of logic when those functions are only ever going to be used once within the lifetime of a ...
9
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5answers
2k views

Multiple arguments in function call vs single array

I have a function that takes in a set of parameters, then applies to them as conditions to an SQL query. However, while I favored a single argument array containing the conditions themselves: ...
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6answers
2k views

Why is “tight coupling between functions and data” bad?

I found this quote in "The Joy of Clojure" on p. 32, but someone said the same thing to me over dinner last week and I've heard it other places as well: [A] downside to object-oriented programming ...
3
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3answers
429 views

Good Procedure or Function Design

This is in reference to the question posted here. As I would judge it, the question there should be closed simply because it seems to ask why the Borland developers made one thing a function and ...
8
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2answers
763 views

What is an example of a continuation not implemented as a procedure?

An interesting discussion about the distinction between callbacks and continuations over on SO has prompted this question. By definition, a continuation is an abstract representation of the logic ...
2
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2answers
355 views

Should I put utility methods inside a class?

I have been working on a library which contains a large set of functions. For the sake of simplicity, I am going to use just one set as an example. I am not sure which is the better way, in terms of ...
27
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4answers
1k views

How do programming languages define functions?

How do programming languages define and save functions/methods? I am creating an interpreted programming language in Ruby, and I am trying to figure out how to implement function declaration. My ...
16
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11answers
1k views

Why are we supposed to use short functions to sectionalize our code? [duplicate]

I've seen an increasing trend in the programming world saying that it is good practice to separate code blocks into their own functions. Obviously, if that code block is reusable, you should do that. ...
0
votes
1answer
69 views

Good practice to use namespace or prefix to indicate what file function is from? [duplicate]

For example, I have the function generate_salt() in encryption.file but the person may not know where generate_salt() is from. Using a namespace like encryption::generate_salt(), or ...
2
votes
3answers
118 views

Non-trivial get function, should it be named differently

For example I have this code. class Command { var $responseFactory; var $service; /** * Returns the class name of the responseFactory if it is set * or the default class name ...
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5answers
576 views

Named output parameters vs return values

Which code is better: // C++ void handle_message(...some input parameters..., bool& wasHandled) void set_some_value(int newValue, int* oldValue = nullptr) // C# void handle_message(...some ...
44
votes
4answers
2k views

How do functional languages handle random numbers?

What I mean about that is that in nearly every tutorial I've read about functional languages, is that one of the great things about functions, is that if you call a function with the same parameters ...
4
votes
2answers
1k views

Reason for return statement in recursive function call

I just had a doubt in my mind. The following subroutine(to search an element, in a list, for example) has a return statement at the end: list *search_list(list *l, item_type x) { if (l == NULL) ...
2
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4answers
306 views

How do you decide what code to put into a function?

I started out with a script that was a few hundred lines. Later, I realized I wanted another script that would require much of the same code. I decided to wrap certain areas of the original script ...
1
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6answers
363 views

Naming functions that retrieve a value

I have this personal rule to start all function/method names with a verb. My verb of choice for functions or methods that get a value based on some data structure or object is get. I'm wondering if ...
0
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1answer
81 views

Show all definitions in Scheme?

I want to see all user-made definitions in a Scheme REPL, both loaded from files and entered at the REPL. Is there any way to "dump all definitions"? E.g. if there is: (define (plusone x) (+ 1 ...
0
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1answer
278 views

PHP function types

I am trying to find a way of classifying different types of PHP functions. For example that fopen, fwrite, fclose and so on are all part of IO, and the MySQL functions and MySQLi class is all for ...
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2answers
1k views

Boolean Method Naming Affirmative vs Negative

Should boolean methods always take the affirmative form, even when they will only ever be used in the negative form? Say I wanted to check whether an entity exists before creating one, my argument is ...
1
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1answer
150 views

Documenting Function That Takes Random Parameters?

What's the best approach to creating documentation (displaying the function prototype if you will) for functions that take a variety of different forms in terms of parameters. Let's say there are 10 ...
3
votes
2answers
422 views

Programming by Intention, Depth-First or Breadth-First?

Say I have the following graph of dependencies between procedures/functions/methods: o / \ v e / \ / \ r f l w That is, function o first calls function v, and then ...
107
votes
13answers
22k views

Is it OK to split long functions and methods into smaller ones even though they won't be called by anything else? [duplicate]

Lately I've been trying to split long methods into several short ones. For example: I have a process_url() function which splits URLs into components and then assigns them to some objects via their ...
11
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4answers
4k views

C++ why & how are virtual functions slower?

Can anyone explain in detail, how exactly the virtual table works & what pointers are associated when virtual functions are called. If they are actually slower, can you show the time that the ...
2
votes
6answers
3k views

CoffeeScript and Named Functions

Elsewhere: an argument has arisen over the terminology of a named function in CoffeeScript. In particular somebody refereed to something like this foo = -> console.log("bar") as a named ...
0
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1answer
143 views

LOOP program only need inc and zero

I have 4 different commands in LOOP programming language: y=Zero() y=Val(x)=copy x and put it in register y y=Inc(x)=x+1 y=Dec(x)=x-1 Finally I also have loop n times { ... ...
2
votes
1answer
150 views

LOOP-computable functions

I was just reading a chapter about LOOP-computable functions and I have the following question: Is it possible to numerate every LOOP program with an algorithm? Formally: Is it possible to have a ...
4
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3answers
362 views

Renaming long named method in C# [closed]

I'm working on a project where exist one method with title string ValidateNewPasswordExpireCurrentPasswordAndCreateNewPassword(...) I'm sure the method name must be changed. But can't found good ...