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

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119
votes
13answers
26k 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 ...
39
votes
9answers
14k 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 ...
89
votes
11answers
7k views

One-line functions that are called only once

Consider a parameterless (edit: not necessarily) function that performs a single line of code, and is called only once in the program (though it is not impossible that it'll be needed again in the ...
17
votes
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. ...
21
votes
4answers
12k views

Where should I put functions that are not related to a class?

I am working on a C++ project where I have a bunch of math functions that I initially wrote to use as part of a class. As I've been writing more code, though, I've realized I need these math functions ...
28
votes
8answers
6k views

Is splitting up a function into several inner functions an anti-pattern? [duplicate]

Imagine a long and complicated process, which is started by calling function foo(). There are several consecutive steps in this process, each of them depending on result of the previous step. The ...
5
votes
18answers
3k views

What do you name functions/variables/etc when you can't think of a good name? [closed]

When you are defining a function/variable/etc and are not sure what to name it, what do you name it? How do you come up with a name? If you use a temporary name as a place-card until you give it it's ...
2
votes
5answers
685 views

When, if ever, should I daisy chain functions?

I'll try to be as brief as possible in respect to your time. In a program divided up into many functions by which it is intended that they execute themselves one after another, when (if ever) is it ...
19
votes
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 ...
13
votes
7answers
3k views

Is there an optimal number of lines of code per function? [closed]

Functions are not only used to minimize duplication of code - they are also used to split up a long function into smaller ones to increase readability, as well as making the code self-commenting. Yet ...
4
votes
4answers
2k views

Best Method of function parameter validation

I've been dabbling with the idea of creating my own CMS for the experience and because it would be fun to run my website off my own code base. One of the decisions I keep coming back to is how best ...
2
votes
3answers
164 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 ...
27
votes
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 ...
9
votes
9answers
6k 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 ...
8
votes
2answers
5k 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
votes
4answers
388 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 ...
3
votes
2answers
588 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 ...
0
votes
5answers
921 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 ...