Function is a block of code which performs a specific task.
-1
votes
0answers
11 views
Error when attempting to call function in different lua file (function is a nil value)
I get the following error when I attempt to use call a function in a box collider object I'm trying to make
The Error:
main.lua:26: attempt to call field 'Update' ( a nil value )
Traceback
...
-3
votes
0answers
47 views
Dynamic function calls in C
How do you write a runtime-dynamic function call in C which would take a variable number of arguments during runtime ?
For example, consider long sum(int count, ...);, which returns the sum of the ...
4
votes
1answer
82 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
votes
3answers
89 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 ...
0
votes
0answers
84 views
Why this code returns me 6561 [migrated]
I was learning function calling by reference and by value, and I am facing problem in discovering why it is returning me 6561.
In my main function I called a function f(p,p) , where p is initialized ...
-1
votes
4answers
233 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
697 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:
$functions = [
"do this" => function() {
// ...
2
votes
1answer
145 views
Why function returning by Address can not be a Lvalue?
Why it is not possible to make it LValue if a function return by address (while possible in case of reference)?
int* returnByAdress()
{
int x =20;
return &x;
}
int& ...
0
votes
2answers
458 views
When to use functions vs methods?
So I know that methods are more OOP than functions.
I was wondering if someone could show me an example of a function and a method and explain the differences between methods and functions to me?
...
0
votes
3answers
246 views
If statements vs switch cases? in a JavaScript game and if to use a function [duplicate]
I am developing a game in JavaScript where you start with a user input, stored in the variable "controller". The options for the user consists of start to start the game or about to learn about the ...
5
votes
2answers
118 views
Should more than one function be used when they do similar, but not identical things?
For example, if I wanted to generate some HTML based on some input. Which is the preferred way out of:
<?php
function generate_html($type, $input){
switch($type){
case 'paragraph':
...
5
votes
6answers
405 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
vote
1answer
100 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
201 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 ...
8
votes
5answers
1k 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:
...
31
votes
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
votes
3answers
419 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
votes
2answers
615 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
votes
2answers
244 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 ...
26
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 ...
16
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. ...
0
votes
1answer
66 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
110 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 ...
-1
votes
5answers
481 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 ...
43
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
625 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
294 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
vote
6answers
347 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
votes
1answer
69 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
votes
1answer
256 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 ...
14
votes
2answers
919 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
vote
1answer
147 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
360 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 ...
103
votes
13answers
21k 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 ...
10
votes
4answers
3k 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 ...
1
vote
3answers
2k 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
votes
1answer
137 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
147 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
votes
3answers
333 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 ...
7
votes
8answers
2k 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 ...
38
votes
9answers
3k views
Why is Today() an example of an impure function?
It seems like, when reading something like this Wikipedia article about "pure functions", they list Today() as an example of an impure function but it seems pretty pure to me. Is it because there is ...
4
votes
2answers
572 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 ...
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 ...
0
votes
2answers
5k 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: ...
17
votes
4answers
6k 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 ...
3
votes
1answer
149 views
Returning status code where one of many errors could have occured
I'm developing a PHP login component which includes functions to manipulate the User object, such as $User->changePassword(string $old, string $new)
What I need some advice with is how to return a ...
7
votes
3answers
751 views
Why can't we write nested shorthand functions in Clojure?
I tried to evaluate a Clojure expression with nested shorthand functions today, and it wouldn't let me.
The expression was:
(#(+ % (#(+ % (* % %)) %)) 5) ; sorry for the eye bleed
The output was:
...
2
votes
1answer
141 views
Does automatic returning affect performance?
There's a bunch of languages that automatically return the last value in a function (mostly functional) like Ruby, Haskell, Lisp, etc.
Does this feature (or what do you call it) affect the ...
0
votes
1answer
157 views
The idea of functionN in Scala / Functionaljava
From brain driven development
It turns out, that every Function you’ll ever define in Scala, will
become an instance of an Implementation which will feature a certain
Function Trait.
...
0
votes
2answers
69 views
Looking for terminology for the relation of a subject and a predicate
While writing some predicates for collection filtering I have stumbled over the choice of the right words for the relation of the subject and the predicate (English is a foreign language for me). What ...
