GDScript reference¶

GDScript is a high-level, object-oriented, imperative, and gradually typed programming language built for Godot.

GDScript is a high-level, dynamically typed programming language used to create content. It uses an indentation-based syntax similar to languages like Python. Its goal is to be optimized for and tightly integrated with Godot Engine, allowing great flexibility for content creation and integration.

GDScript is entirely independent from Python and is not based on it.

History¶

Note

Documentation about GDScript's history has been moved to the Frequently Asked Questions.

Example of GDScript¶

Some people can learn better by taking a look at the syntax, so here's an example of how GDScript looks.

# Everything after "#" is a comment.
# A file is a class!

# (optional) class definition:
class_name MyClass

# Inheritance:
extends BaseClass

# (optional) icon to show in the editor dialogs:
@icon("res://path/to/optional/icon.svg")


# Member variables.
var a = 5
var s = "Hello"
var arr = [1, 2, 3]
var dict = {"key": "value", 2: 3}
var other_dict = {key = "value", other_key = 2}
var typed_var: int
var inferred_type := "String"

# Constants.
const ANSWER = 42
const THE_NAME = "Charly"

# Enums.
enum {UNIT_NEUTRAL, UNIT_ENEMY, UNIT_ALLY}
enum Named {THING_1, THING_2, ANOTHER_THING = -1}

# Built-in vector types.
var v2 = Vector2(1, 2)
var v3 = Vector3(1, 2, 3)


# Functions.
func some_function(param1, param2, param3):
    const local_const = 5

    if param1 < local_const:
        print(param1)
    elif param2 > 5:
        print(param2)
    else:
        print("Fail!")

    for i in range(20):
        print(i)

    while param2 != 0:
        param2 -= 1

    match param3:
        3:
            print("param3 is 3!")
        _:
            print("param3 is not 3!")

    var local_var = param1 + 3
    return local_var


# Functions override functions with the same name on the base/super class.
# If you still want to call them, use "super":
func something(p1, p2):
    super(p1, p2)


# It's also possible to call another function in the super class:
func other_something(p1, p2):
    super.something(p1, p2)


# Inner class
class Something:
    var a = 10


# Constructor
func _init():
    print("Constructed!")
    var lv = Something.new()
    print(lv.a)

If you have previous experience with statically typed languages such as C, C++, or C# but never used a dynamically typed one before, it is advised you read this tutorial: GDScript: An introduction to dynamic languages.

Language¶

In the following, an overview is given to GDScript. Details, such as which methods are available to arrays or other objects, should be looked up in the linked class descriptions.

Identifiers¶

Any string that restricts itself to alphabetic characters (a to z and A to Z), digits (0 to 9) and _ qualifies as an identifier. Additionally, identifiers must not begin with a digit. Identifiers are case-sensitive (foo is different from FOO).

Keywords¶

The following is the list of keywords supported by the language. Since keywords are reserved words (tokens), they can't be used as identifiers. Operators (like in, not, and or or) and names of built-in types as listed in the following sections are also reserved.

Keywords are defined in the GDScript tokenizer in case you want to take a look under the hood.

Keyword	Description
if	See if/else/elif.
elif	See if/else/elif.
else	See if/else/elif.
for	See for.
while	See while.
match	See match.
break	Exits the execution of the current `for` or `while` loop.
continue	Immediately skips to the next iteration of the `for` or `while` loop. Stops execution in `match` and looks for a match in patterns below it
pass	Used where a statement is required syntactically but execution of code is undesired, e.g. in empty functions.
return	Returns a value from a function.
class	Defines a class.
class_name	Defines the script as a globally accessible class with the specified name.
extends	Defines what class to extend with the current class.
is	Tests whether a variable extends a given class, or is of a given built-in type.
as	Cast the value to a given type if possible.
self	Refers to current class instance.
signal	Defines a signal.
func	Defines a function.
static	Defines a static function. Static member variables are not allowed.
const	Defines a constant.
enum	Defines an enum.
var	Defines a variable.
breakpoint	Editor helper for debugger breakpoints.
preload	Preloads a class or variable. See Classes as resources.
await	Waits for a signal or a coroutine to finish. See Awaiting for signals.
yield	Previously used for coroutines. Kept as keyword for transition.
assert	Asserts a condition, logs error on failure. Ignored in non-debug builds. See Assert keyword.
void	Used to represent that a function does not return any value.
PI	PI constant.
TAU	TAU constant.
INF	Infinity constant. Used for comparisons and as result of calculations.
NAN	NAN (not a number) constant. Used as impossible result from calculations.

Operators¶

The following is the list of supported operators and their precedence.

Operator	Description
`x[index]`	Subscription (highest priority)
`x.attribute`	Attribute reference
`foo()`	Function call
`is`	Instance type checker
`**`	Power operator Multiplies value by itself `x` times, similar to calling `pow` built-in function
`~`	Bitwise NOT
`-x`	Negative / Unary negation
`*` `/` `%`	Multiplication / Division / Remainder These operators have the same behavior as C++. Integer division is truncated rather than returning a fractional number, and the % operator is only available for ints (`fmod` for floats), and is additionally used for Format Strings
`+`	Addition / Concatenation of arrays
`-`	Subtraction
`<<` `>>`	Bit shifting
`&`	Bitwise AND
`^`	Bitwise XOR
`\|`	Bitwise OR
`<` `>` `==` `!=` `>=` `<=`	Comparisons
`in`	When used with the `if` keyword it checks if a value is within a string, list, range, dictionary, or node. When used with the `for` keyword it is used to iterate though the contents of a string, list, range, dictionary or node.
`not`	Boolean NOT
`and`	Boolean AND
`or`	Boolean OR
`if x else`	Ternary if/else
`as`	Type casting
`=` `+=` `-=` `=` `/=` `%=` `*=` `&=` `\|=` `<<=` `>>=`	Assignment (lowest priority)

Literals¶

Literal	Type
`45`	Base 10 integer
`0x8f51`	Base 16 (hexadecimal) integer
`0b101010`	Base 2 (binary) integer
`3.14`, `58.1e-10`	Floating-point number (real)
`"Hello"`, `"Hi"`	Strings
`"""Hello"""`	Multiline string
`&"name"`	StringName
`^"Node/Label"`	NodePath
`$NodePath`	Shorthand for `get_node("NodePath")`

Integers and floats can have their numbers separated with _ to make them more readable. The following ways to write numbers are all valid:

12_345_678  # Equal to 12345678.
3.141_592_7  # Equal to 3.1415927.
0x8080_0000_ffff  # Equal to 0x80800000ffff.
0b11_00_11_00  # Equal to 0b11001100.

Annotations¶

There are some special tokens in GDScript that act like keywords but are not, they are annotations instead. Every annotation start with the @ character and is specified by a name.

Those affect how the script is treated by external tools and usually don't change the behavior.

For instance, you can use it to export a value to the editor:

@export_range(1, 100, 1, "or_greater")
var ranged_var: int = 50

Annotations can be specified one per line or all in the same line. They affect the next statement that isn't an annotation. Annotations can have arguments sent between parentheses and separated by commas.

Both of these are the same:

@onready
@export_node_path(TextEdit, LineEdit)
var input_field

@onready @export_node_path(TextEdit, LineEdit) var input_field

Here's the list of available annotations:

Annotation	Description
`@tool`	Enable the Tool mode.
`@onready`	Defer initialization of variable until the node is in the tree. See @onready annotation.
`@icon(path)`	Set the class icon to show in editor. To be used together with the `class_name` keyword.
`@rpc`	RPC modifiers. See high-level multiplayer docs.
`@export` `@export_enum` `@export_file` `@export_dir` `@export_global_file` `@export_global_dir` `@export_multiline` `@export_placeholder` `@export_range` `@export_exp_easing` `@export_color_no_alpha` `@export_node_path` `@export_flags` `@export_flags_2d_render` `@export_flags_2d_physics` `@export_flags_3d_render` `@export_flags_3d_physics`	Export hints for the editor. See GDScript exports.

Comments¶

Anything from a # to the end of the line is ignored and is considered a comment.

# This is a comment.

Line continuation¶

A line of code in GDScript can be continued on the next line by using a backslash (\). Add one at the end of a line and the code on the next line will act like it's where the backslash is. Here is an example:

var a = 1 + \
2

A line can be continued multiple times like this:

var a = 1 + \
4 + \
10 + \
4

Built-in types¶

Built-in types are stack-allocated. They are passed as values. This means a copy is created on each assignment or when passing them as arguments to functions. The only exceptions are Arrays and Dictionaries, which are passed by reference so they are shared. (Packed arrays such as PackedByteArray are still passed as values.)

Basic built-in types¶

A variable in GDScript can be assigned to several built-in types.

null¶

null is an empty data type that contains no information and can not be assigned any other value.

bool ¶

Short for "boolean", it can only contain true or false.

int ¶

Short for "integer", it stores whole numbers (positive and negative). It is stored as a 64-bit value, equivalent to "int64_t" in C++.

float ¶

Stores real numbers, including decimals, using floating-point values. It is stored as a 64-bit value, equivalent to "double" in C++. Note: Currently, data structures such as Vector2, Vector3, and PackedFloat32Array store 32-bit single-precision "float" values.