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

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How to define common function in c [migrated]

I've got two c programs: program1.c and program2.c Both of the two programs, have three or more same functions. How can I define them one time and use it inside both? An example: I've got two ...
2
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2answers
122 views

Property or Method to obtain information about a collection?

Suppose I have a MyList class which extends ObservableCollection<MyObject> where MyObject has the Boolean Property Enabled. Let's say I want the number of MyObject objects that have the ...
2
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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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3answers
140 views

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
0
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1answer
215 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 ...
1
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2answers
178 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
125 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
263 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 ...
22
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4answers
10k views

Why store a function inside a python dictionary?

I'm a python beginner, and I just learned a technique involving dictionaries and functions. The syntax is easy and it seems like a trivial thing, but my python senses are tingling. Something tells me ...
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3answers
108 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 ...
2
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2answers
286 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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1answer
126 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 ...
5
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6answers
555 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 ...
3
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2answers
717 views

How can “hash functions” be used to implement hash maps at all?

My understandment is that hash maps allow us to link, say, a string, to certain memory location. But if every string were to be linked to a unique place in memory it would need a huge block of empty ...
2
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3answers
138 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 ...
2
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1answer
82 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
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4answers
103 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 ...
29
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9answers
6k views

Are there guidelines on how many parameters a function should accept?

I've noticed a few functions I work with have 6 or more parameters, whereas in most libraries I use it is rare to find a function that takes more than 3. Often a lot of these extra parameters are ...
1
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3answers
218 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 ...
10
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8answers
5k views

Feature vs. Function

Often I hear PMs (Project Managers) talk about feature and function. And I'm just so puzzled to differentiate them. Sometimes I think of a feature to be equivalent to a user story. Something like "As ...
4
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1answer
202 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 ...
2
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6answers
761 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() { // ...
0
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3answers
104 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 ...
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4answers
246 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 ...
7
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8answers
3k views

Why Java does not allow function definitions to be present outside of the class?

Unlike C++, in Java, we cannot have just function declarations in the class and definitions outside of the class. Why is it so? Is it to emphasize that a single file in Java should contain only one ...
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2answers
1k 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? ...
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3answers
861 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
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2answers
126 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': ...
3
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5answers
2k views

Template Functions and Function templates in C++

I came across a question which asked the difference between Function Templates and Template Functions in C++ and also Template Classes and Class Templates. I was under the impression that Function ...
0
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2answers
7k views

Drawing Flowchart for function calculate a number in the Fibonacci Series

I'm trying make Flowchart for function calculate a number in the Fibonacci Series. But It looks like not right. I don't how draw the recursive function. Please help me how to fix it. My flowchart: ...
6
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6answers
464 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
117 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
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2answers
210 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 ...
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 ...
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: ...
8
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2answers
775 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 ...
32
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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 ...
2
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2answers
368 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. ...
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6answers
3k views

Function like C# properties?

I've been thinking about how C# properties work and could work. I know the purpose that C# properties were originally designed for, which is certainly useful. However instead in this question I'm ...
0
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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 ...
19
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2answers
1k views

Is it a good idea to provide different function signatures that do the same thing?

Here is a C++ class that gets constructed with three values. class Foo{ //Constructor Foo(std::string, int, char); private: std::string foo; char bar; int baz; }; All of ...
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 ...
2
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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 ...
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 ...
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5answers
589 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 ...
4
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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
308 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 ...