List Problem

ID:1735323
 
Dec 8 2014, 4:51 am
(See the best response by Stephen001.)
Code:
obj
    HudIntro
        NameButtons
            icon='Text.dmi'
            Upper
                layer = 100000
                A
                    icon_state="A"
                    screen_loc ="2,3"

                ...

                Click()

                    usr.namelist+=src.name
                    usr.TOSTOSC(4,10,4,4,"[usr.namelist]")

Problem description:

I created hud keyboard where you have to click on letter to create your name.

I am wondering how to detect the last letter in list and delet it because I want to create back button where you can arase your last choosen letter

Dec 8 2014, 5:04 am
Just find the end of the list with length().

var/list/letters = list("a","b","c")
mob/verb
    last()
        world << "The last element is [letters[length(letters)]]!"
Dec 8 2014, 5:21 am
Could you help me out a bit more I tried

                Click()
                    var/obj/HudIntro/NameButtons/m
                    if(length(usr.namelist)==m)
                        usr.namelist-=m
                        
                    usr.TOSTOSC(4,10,4,4,"[usr.namelist]")

But nothing happend. So what am i doing wrong here?
Dec 8 2014, 5:39 am
Best response
length() returns the length of the list, AKA a number. So:
if (length(usr.namelist)==m)

Reads like:
if (12==m)

For example. By printing out the values, it should become apparent to you what is wrong about the code you've tried there:
                Click()
                    var/obj/HudIntro/NameButtons/m
                    world << "length(usr.namelist) = [length(usr.namelist)]"
                    world << "m = [m]"
                    if(length(usr.namelist)==m)
                        usr.namelist-=m

                    usr.TOSTOSC(4,10,4,4,"[usr.namelist]")
Dec 8 2014, 5:40 am
length(usr.namelist) is just a number, the index of the last element. Assuming you want to actually access the last element of the list, you need
usr.namelist[length(usr.namelist)]


EDIT: I was beaten by Stephan. Still do the exercise that he provided; it is a good example in learning debugging.
Dec 8 2014, 6:02 am
Ok i know what i did wrong and I see now stephans point but right now im really confused about everything nd dont know how can I do it to make it work
Dec 8 2014, 6:04 am
Unfortunately, we cannot help if you don't explain your problems. What are you confused about?
Dec 8 2014, 6:09 am
I tried to do it like this

                Click()
                    var/obj/HudIntro/NameButtons/m 
            
                    if(usr.namelist[length(usr.namelist)]==m)
                        usr.namelist-=m
    
                    usr.close_menu(/**/)
                    usr.TOSTOSC(4,10,4,4,"[usr.namelist]")


and it sas it cant read from the list. I still want to access the last element of the list (not the index number) and delet it
Dec 8 2014, 6:24 am
First of all, you did not initialize m. I doubt that that m will ever be equal to the last element. Second, you should not have issues accessing the list. Did you initialize it correctly?