Little Godot things to remember that I forget after a few months away

simple_godot_things.gd

# How to do setters and getters in Godot 4:
var size: int: set = set_size
var forward: Vector3: get = get_forward
var files: Array: get = get_files, set = set_files # I think

# Getting the current active camera.
var main_camera: Camera3D = get_viewport().get_camera_3d()

# Direction based of keyboard input.
var input_direction: Vector2 = Input.get_vector("move_left", "move_right", "move_forward", "move_backward")

# Get direction relative to camera rotation.
func transform_direction_to_camera_angle(direction: Vector3) -> Vector3:
	var camera = get_viewport().get_camera_3d()
	var camera_angle_y = camera.global_transform.basis.get_euler().y
	
	return direction.rotated(Vector3.UP, camera_angle_y)
	
# Iterate backwards over an array
for index in range(arr.size() - 1, -1, -1):
	var item = item[index]
	
# Like `look_at` but only on the Y axis.
# TODO: Add `speed` argument here to lerp rotation over time?
func face_towards(target: Vector3, speed: float = 0.0, delta: float = 0.0) -> void:
	if global_transform.origin == target:
		return
		
	if is_zero_approx(speed):
		look_at(target, Vector3.UP)
		global_rotation.x = 0
		global_rotation.z = 0
	else:
		# From: https://github.com/JohnnyRouddro/3d_rotate_direct_constant_smooth/blob/master/rotate.gd
		var direction = global_transform.origin.direction_to(target)
		global_rotation.y = lerp_angle(rotation.y, atan2(-direction.x, -direction.z), speed * delta)
		
# Check if resource exists. Use this instead of `FileAccess.file_exists` because it will work even in 
# exported projects where the `.import` files may get in the way or something
ResourceLoader.exists("res://path/to/resource")

# Do string contact without joining strings together with `+`:
var resouce_path = "res://dialogue/%s.dialogue" % "hello"

# Get display scale, good for scaling stuff on retina displays:
DisplayServer.screen_get_scale()