Why would pop_front() work but not pop_back()? I cant get it to work to remove last element in array.

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:bust_in_silhouette: Asked By PampoenKoekie 
func _input(event):
#  Check the keyboard typing and append it to Global variable typedWord
if event is InputEventKey:
	if event.pressed:
		var typing = char(event.unicode).to_upper()
		Globals.typedWordArray.append(typing)
		
	if event.is_action_pressed("ui_text_backspace"):
		Globals.typedWordArray.pop_back()
		print (Globals.typedWordArray)

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pop_back will only do something if the array is not empty, assuming your if is entered.
What problem are you actually encountering? What do you mean by “pop_back not working”?

Zylann | 2023-07-06 14:04

Thank you for you reply. The array is not empty, I type a word and show what im typing in a label, all works great. Then when I want to erase the last element by pressing backspace, I want to use pop_back(), but it just does nothing, but if I replace it with pop_front() it works as I want but only in reverse. I print the array to console to see what it does and it writes to to the array fine, it reads from the array fine and when I use pop_front(), the array shows removing the first element in console, but as soon as I change it to pop_back(), nothing happens. Thats why Im not understanding. Even if I use clear() method on the array it works.

I could make a video clip aswell showing it all, but thank you for your help.

PampoenKoekie | 2023-07-06 14:13

Thanks for your help, Im new here so still learning.

PampoenKoekie | 2023-07-06 14:20

I don’t know what’s up with this tbh. Did you try testing pop_back in a very simple project or scene to see if it works as intented?
I see no reason for pop_front to work and not pop_back…
What kind of array is typedWordArray?

Zylann | 2023-07-06 14:21

Yes, its really weird, all methods work except pop_back(). I will try your advice on a test project and see what’s going on… typedWordArray is a Global String array.

#  Array for seperate letters being typed
   var typedWordArray = []

PampoenKoekie | 2023-07-06 14:30

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:bust_in_silhouette: Reply From: Zylann

I think i see what’s going on…

Your code always appends an element to the array when a key is pressed, including Backspace. It enters both if blocks. So when you press Backspace, you try to convert it to unicode (which gives you an empty string I presume) and then you do pop_back, which ends up removing that empty string and the result is as if nothing changed.

You need to not append to the array if it’s not a character key.

Amazing! Thank you ever so much! That’s exactly what it does, thanks for noting that. I appreciate your time and help, have a wonderful day and keep well, maybe we meet again soon.

PampoenKoekie | 2023-07-06 14:55

Just a follow-up, I have gotten it to work wonderfully thanks to your help.

func _input(event):
#  Check the keyboard typing and append it to Global variable typedWord
if event is InputEventKey:
	if event.is_pressed() and not event.is_action_pressed("ui_text_backspace"):
		var typing = char(event.unicode).to_upper()
		Globals.typedWordArray.append(typing)

if event.is_action_pressed("ui_text_backspace"):
	Globals.typedWordArray.pop_back()
	print (Globals.typedWordArray)

PampoenKoekie | 2023-07-06 15:35

Careful, if the user presses any other key such as arrows, Ctrl, Shift, Alt or Fkeys you will also have the same problem.

Zylann | 2023-07-06 15:50