Calculator Script (Delete Error)

extends Node2D

var numberBefore
var operation

func _ready():
    pass # Replace with function body.

func _on_Button1_pressed():
    var currentNumber = $NumberStuffs.get_text()

    currentNumber = currentNumber + "1"
    $NumberStuffs.set_text(currentNumber)

func _on_Button2_pressed():
    var currentNumber = $NumberStuffs.get_text()

    currentNumber = currentNumber + "2"
    $NumberStuffs.set_text(currentNumber)

func _on_Button3_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "3"
    $NumberStuffs.set_text(currentNumber)

func _on_Button4_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "4"
    $NumberStuffs.set_text(currentNumber)

func _on_Button5_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "5"
    $NumberStuffs.set_text(currentNumber)

func _on_Button6_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "6"
    $NumberStuffs.set_text(currentNumber)

func _on_Button7_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "7"
    $NumberStuffs.set_text(currentNumber)

func _on_Button8_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "8"
    $NumberStuffs.set_text(currentNumber)

func _on_Button9_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "9"
    $NumberStuffs.set_text(currentNumber)

func _on_Button10_pressed():
    var currentNumber = $NumberStuffs.get_text()
    currentNumber = currentNumber + "0"
    $NumberStuffs.set_text(currentNumber)

func _on_Vibes_pressed():
    $NumberStuffs.set_text(":D")

    #-----#

func _on_BDivide_pressed():
    numberBefore = $NumberStuffs.get_text()
    operation = "Division"
    $NumberStuffs.set_text("")

func _on_BMultiplication_pressed():
    numberBefore = $NumberStuffs.get_text()
    operation = "Multiplication"
    $NumberStuffs.set_text("")

func _on_BSubtraction_pressed():
    numberBefore = $NumberStuffs.get_text()
    operation = "Subtraction"
    $NumberStuffs.set_text("")

func _on_BAddition_pressed():
    numberBefore = $NumberStuffs.get_text()
    operation = "Addition"
    $NumberStuffs.set_text("")

func _on_BEquals_pressed():
    var numberAdded = $NumberStuffs.get_text()
    var result

    if operation == "Division":
        result = int(numberBefore) / int(numberAdded)
        $NumberStuffs.set_text(str(result))

    if operation == "Multiplication":
        result = int(numberBefore) * int(numberAdded)
        $NumberStuffs.set_text(str(result))

    if operation == "Subtraction":
        result = int(numberBefore) - int(numberAdded)
        $NumberStuffs.set_text(str(result))

    if operation == "Addition":
        result = int(numberBefore) + int(numberAdded)
        $NumberStuffs.set_text(str(result))

func _on_BDeleteDigit_pressed():
    var numberAdded
    var numberBefore = $NumberStuffs.get_text()
    numberAdded = numberAdded.length() - 1
    numberAdded[numberBefore]=("")
    $Outputlabel.set_text(str(numberAdded))

func _on_BClear_pressed():
    $NumberStuffs.set_text("")