probleme with auto increamentation (++, +=) Operators

[Jonforum]

hi am trying make a easy way to auto increase a variable .


in this example, so 


when i showPicture , the var PID and defxy[1] need to increase after show.
Is work good for ++, but not the +=


function ActionKey(WhatToDo) {
var PID = 83; // default PID for actionkey huds
var defxy = [1200,500]; // default x y pos for actionkey
var PH = 125; // picture fixed heigth from Action-Key.png
if (WhatToDo==='show') {
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
}
}






The way clearer.
Why does this return me 5, 6 and not 5, 5  ?


var A = 5;
var B = 5;
console.log((A++)+ ' ' + (B+=1)); // return 5 6




That fµ©£ me, all the easy way, with which I would like make my code.
Is there a way? or is a buggy javascript ?

 

[Zeriab]

http://stackoverflow.com/questions/26031404/what-does-x-in-javascript-do


That said, I recommend not creating such convoluted lines. Split them up into more lines where the actions are clearer. Easier to read, easier to debug.

 

[Engr. Adiktuzmiko]

The way clearer.
Why does this return me 5, 6 and not 5, 5  ?



var A = 5;
var B = 5;
console.log((A++)+ ' ' + (B+=1)); // return 5 6

It returns 5,6 instead of 5,5 because += sets it to 6 before the return call..


++ adds but returns the original value


+= adds and returns the new value


if showing it similar to a code makes more sense

// var ++ works like this

var A = 5
var A_original = A
A = A + 1
return A_original

// var += value works like this

var A = 5
A = A + value
return A

 

[Jonforum]

exist somes ways to syntaxe ++ returns the original value , but with a variable ?


example:

A = 5;
B = 5;

Console.log( (A++B) ); // example return 5
Console.log( (A++B) ); // example return 10
Console.log( (A) ); // example return 15

 

[Engr. Adiktuzmiko]

IDK if that's possible, but why not just make it such that your variables are


var PH = 125;
var defxy = [1200,500-PH];



so that your first defxy[1] += line will return 500 which is the first value that you want to use

 

[Jonforum]

@Engr. Adiktuzmiko


The complete code is a little more laborious.
I had purified it for my question.


But thank you, I think that answers my question.
we cannot
I will do as I usually do.


EDIT: HAHA ok '  why not just make it such that your variables '


ok is true, Thank you I was tired

 

[Engr. Adiktuzmiko]

I'm not sure if you really cant, and I can't test so I just gave the most plausible answer that I can think of.


You can still test A++B in case it might actually be doable


now if you can't do my suggestion of still using += with your original variable reduced by the first increment (but IDK of a situation where that cannot be done so far), then you could just do


if (WhatToDo==='show') {
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1], 100, 100, 255, 0);
defxy[1]+=PH;
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1], 100, 100, 255, 0);
defxy[1]+=PH;
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1], 100, 100, 255, 0);
defxy[1]+=PH;
}




EDIT : so you can do the 500-PH edit?

 

[Jonforum]

I


EDIT : so you can do the 500-PH edit?

Yes i test and it worked impeccably it was the way I wanted to build my code.
It suffisait d'y thought, I don't regret my question you helped.
Thank you.


Example: for auto incrementation


function ActionKey(WhatToDo) {
var PID = 83; // default PID for actionkey huds
var PH = 125; // picture fixed heigth from Action-Key.png
var defxy = [1200,500-PH]; // default x y pos for actionkey

if (WhatToDo==='show') {
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
$gameScreen.showPicture(PID++, 'Action-Key', 0, defxy[0], defxy[1]+=PH, 100, 100, 255, 0);
}
}


@