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

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5
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2answers
422 views

Function that requires many parameters

I have a problem related to this: Are there guidelines on how many parameters a function should accept? In my case, I have a function that describes a rounded rectangle. The caller specifies An ...
4
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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 ...
19
votes
4answers
15k views

Function declaration as var instead of function

More and more I'm seeing functions being declared like var foo = function() { // things }; Instead of how I had learned, like function foo() { // things } What's the difference? Better ...
14
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1answer
2k views

Why does the C library use macros and functions with same name?

I am reading 'The Standard C Library' by PJ Plauger which is really interesting. The book explains not only how to USE the library but also how it is implemented. I have finished reading the ctype.h ...
4
votes
8answers
526 views

Confusion regarding def function within Python

I've been learning Python for about 2 months now (Started with Learn Python The Hard Way, now reading Dive Into Python), and within both books, I still seem to be confused over this one bit of code. ...
3
votes
3answers
400 views

How are functions called when passing ++

I don't understand what is passed to the function f() when I call it like this. main() { void f(int,int); int i=10; f(i,i++); } void f(int i,int j) { printf("%d %d",i,j); } gives me 11 10 ...
11
votes
5answers
346 views

Convert list of 24-hour-precipitation values into total-by-hour

Let's say I have a list of precipitation values by hour, each showing how much rain happened in the prior 24 hours, ordered by date. For example: { '2012-05-24 12:00': 0.5, // .5" of rain from ...
6
votes
4answers
1k views

What is the name for a NON-self-calling function?

I have a collection of normal functions and self-calling functions within a javascript file. In my comments i want to say something along the lines of "This script can contain both self-calling and ...
3
votes
3answers
1k views

Call stack starts at bottom or top?

A stack is something that piles bottom-up. Hence a call stack adds new items on the stack when functions are called with items being removed from the stack as each function ends until the stack is ...
35
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9answers
12k 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 ...
-9
votes
6answers
5k 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
votes
1answer
150 views

Using functions as statements on Python

A great feature of Javascript is function statements. You can do this: (function myFunc(){ doSomething(); doSomethingElse(); })(); Which is a way to declare a function and call it without ...
4
votes
5answers
696 views

Using php functions, reserved words as local identifiers [closed]

I'm thinking of some of the array functions. "key", "each", "pos", "range". These are often very useful as local identifiers! I have also seen code that (ab)uses $return, $list, $array, $string. What ...
21
votes
4answers
11k 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 ...
3
votes
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 ...
2
votes
2answers
1k views

What is Module Object and Function Object?

I am currently teaching myself Python, using the GNU licensed book "Introduction to Computer Science using Python." In chapter 3, functions are covered. While I understand the concept of functions ...
3
votes
2answers
303 views

Should I use chained functions in Java?

From time to time, I'll have a class in Java that takes a multitude of parameters, however, sometimes when I am creating an object of this class, I don't need to use all the parameters. As of now, I ...
3
votes
5answers
1k views

Functions with side-effects in Delphi/Pascal

What is the proper approach to functions that have side-effects in Delphi/Pascal? For example, I could have a boolean function DeleteFile that returns True if the file was deleted and False ...
88
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 ...
8
votes
5answers
1k views

When would dynamic scoping be useful?

With dynamic scoping, a callee can access the variables of its caller. Pseudo C code: void foo() { print(x); } void bar() { int x = 42; foo(); } Since I have never programmed in a ...
3
votes
2answers
2k views

Setting $_POST variables as a means of passing data / Not passing parameters in functions

I've got a legacy PHP web application wherein almost each and every function makes references to $_POST variables - retrieving their values, AND setting them (or setting new POST variables) as a means ...
14
votes
8answers
7k views

Feature vs. Function [closed]

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 ...
3
votes
8answers
490 views

Wrapping simple statement in a function in java?

I was working on neo4j graph database in java. To get the reference node of this db: GraphDatabaseService graphDb=new EmbeddedGraphDatabase(DB_PATH); Node Root=graphDb.getReferenceNode() I ...
10
votes
2answers
729 views

Design: Object method vs separate class's method which takes Object as parameter?

For example, is it better to do: Pdf pdf = new Pdf(); pdf.Print(); or: Pdf pdf = new Pdf(); PdfPrinter printer = new PdfPrinter(); printer.Print(pdf); Another example: Country m = new ...
3
votes
4answers
1k views

Is function memoization really only for primitives?

I was thinking about this for quite some time. Is function memoization really only for primitives? I currently have this piece of code: Public Shared Function Mize(Of TArg1 As Structure, ...
6
votes
3answers
2k views

Good use of wrapper functions?

What do you consider good use of wrapper functions? When are they useful abstractions and in what cases harmful and unnecessary complexity?
12
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5answers
2k views

Why are PHP function signatures so inconsistent? [closed]

I was going through some PHP functions and I could not help notice the following: <?php function foo(&$var) { } foo($a); // $a is "created" and assigned to null $b = array(); foo($b['b']); ...
5
votes
3answers
2k views

Static methods or static functions?

I was just reading http://stackoverflow.com/questions/155609/what-is-the-difference-between-a-method-and-a-function and all of a sudden, the thing came to my mind was the static methods. As static ...
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 ...
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 ...