What is the difference between function with parameter and function without parameter, and what are their benefits?

Question

1.00/5 (4 votes)

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Examples:

PHP

//function with Parameters

  public function Name($fname, $lname) {

     return $fname . ' ' . $lname;

  }


//function without Parameters

  public $fname;
  public $lname;


  public function Name() {

    return $this->fname . ' ' . $this->lname;

  }

What I have tried:

please Just answer my question, It's quite hurtful to be ignored so please it doesn't matter if its accurate or not, I just want the idea's, concepts about it. ~~so please don't be a arrogant prideful ass.~~ [EDITED]

Posted 18-Oct-18 21:56pm

HappyPines

Updated 19-Oct-18 5:10am

Leo Chapiro

v5

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Comments

CPallini 19-Oct-18 4:21am

"so please don't be a arrogant prideful ass"
Sorry?!

Leo Chapiro 19-Oct-18 4:34am

Maybe bad experienses in other forums, I can't imagine that was someone of us :)

CPallini 19-Oct-18 4:51am

A bit odd, as preventive measure.

Leo Chapiro 19-Oct-18 5:11am

Yea, a kind of "aggressive" defense :)

Richard MacCutchan 19-Oct-18 7:22am

"so please don't be a arrogant prideful ass."
Yeah, maybe you should try that yourself.

HappyPines 19-Oct-18 8:41am

Sorry about my earlier statement there. I have ask far to many forum for this question, I was just pissed but even the example is incomplete, so I am really sorry if I offended some of you. really sorry

HappyPines 19-Oct-18 8:51am

What am I really asking is, since I heard the phrase the best function are those without parameters, so I've been asking a lot of forums about it, and my real question is example you have a class.

//With
class Profile {

public $fname;
public $lname;

public function __construct($fname, $lname) {

$this->fname = $fname;
$this->lname = $lname;

}

public function fullName() {

return $this->fname . " " . $this->lname;

}

}

$Happy = new Profile("Happy", "Pines");
echo $Happy->fullName();

//Without
class Profile {

public $fname;
public $lname;

public function __construct() {

}

public function fullName() {

return $this->fname . " " . $this->lname;

}

}

$Happy = new Profile;
$Happy->fname = "Happy";
$Happy->lname = "Pines";
echo $Happy->fullName();

3 solutions

Solution 1

Your question is tagged with "PHP" but I think this is a generic question, not dependend on a special programming language.

If you don't use the parameters in your function, it is very "static" so to say.
By using the parameters you can use your function more versatile.

Jusat imagine, you want to write a function that adds two integers.
Is it not simple, to use this two integers as the parameters of the function?

Posted 18-Oct-18 22:23pm

Leo Chapiro

Updated 18-Oct-18 22:25pm

v3

Solution 2

Simple: a function with parameters can work on data entirely internally, it doesn't rely on external values.
Think of it like this - if you wrote an addition function writing it without parameters makes it clumsy to use:
1) Load left value into variable1
2) Load right value into variable2
3) Call function.
With parameters, it's a lot cleaner:
1) Call function passing left and right values.

It also means that recursive functions can work: where a function is defined in terms of itself:

factorial (n): where n > 1 then n * factorial(n - 1) else 1

To do that with variables is a lot more complex, because you need to save the value of n in a stack of some form yourself to prevent you messing up previous incarnations.

Posted 18-Oct-18 22:28pm

OriginalGriff

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CHill60 · Accepted Answer · 2018-10-19T05:10:00

Further to the other solutions but picking up on your comment

Quote:
I heard the phrase the best function are those without parameters

I suspect someone has said this in respect of using classes. They were probably trying to get over that you should use the (internal) properties of the class within it's methods and functions rather than relying on external data passed into (the class).

This is a very narrow view of the use of functions and would usually mean that you have to have an instance of the class in order to do anything with the functions. But having static "helper" classes can also bring its own problems. There is a good discussion on that topic here[^] - see the solution by Mark Rasmussen.

There is no one-size-fits-all solution and what one person thinks of as "best" in one scenario may not be the best for another scenario. Your ability to judge this for yourself will increase with practise