Challenge 3: Godot signal

Write GDScript that defines a custom signal and emits it with emit_signal.

Custom Signals in GDScript

Signals are used in Godot to establish loosely coupled communication between nodes. In GDScript, a custom signal is declared using signal signal_name. When an event occurs, listeners are notified by calling emit_signal("signal_name").

signal mission_completed

func complete_mission():
    emit_signal("mission_completed")

Exercise Signal Emission Task

In the tetikle() function, call emit_signal("can_bitti") and print with print("Sinyal yayildi").

Show example solution

# GDScript
signal can_bitti

func tetikle():
    emit_signal("can_bitti")
    print("Sinyal yayildi")

func _init():
    tetikle()

Exercise Parameterized Signal Emission

Inside puan_ver(), call emit_signal("puan_kazanildi", 100) and print print("Puan iletildi: 100").

Show example solution

# GDScript
signal puan_kazanildi(miktar)

func puan_ver():
    emit_signal("puan_kazanildi", 100)
    print("Puan iletildi: 100")

func _init():
    puan_ver()

Test yourself

Which method is used in GDScript to trigger and broadcast a defined custom signal to listeners?
- send_event("sinyal_adi")
- emit_signal("sinyal_adi")
- broadcast("sinyal_adi")
- call_signal("sinyal_adi")
Show answer

emit_signal("sinyal_adi") — In Godot, signals are broadcast to listeners by calling the emit_signal() method.
Define Custom Signal
```
____ can_azaldi
```
Show answer
```
signal can_azaldi
```
Godot Signal Architecture

signal

Keyword to define signal in GDScript
emit_signal

Triggers and emits defined signal
connect

Connects signal to a target function
Observer Pattern

Observer pattern behind signal system

Next lesson: Challenge 4: UI button

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