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  1. API Reference
  2. RunService

RunService

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  2. runservice

RunService

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RunService contains methods and events for time-management as well as for managing the context in which a game or script is running. Methods like RunService/IsClient|IsClient, RunService/IsServer|IsServer, RunService/IsStudio|IsStudio, can help you determine under what context code is running. These methods are useful for ModuleScripts that may be required by both client and server scripts. Furthermore, RunService/IsStudio|IsStudio can be used to add special behaviors for in-studio testing.

RunService also houses events that allow your code to adhere to Roblox’s frame-by-frame loop, such as RunService/Stepped|Stepped, RunService/Heartbeat|Heartbeat and RunService/RenderStepped|RenderStepped. Selecting the proper event to use for any case is important, so you should read articles/Task Scheduler|Task Scheduler to make an informed decision.

Properties

Inherited from Instance: Show Hide

bool

Archivable

Determines if an Instance can be cloned using /Instance/Clone or saved to file.
string

ClassName

[ReadOnly] [NotReplicated]

A read-only string representing the class this Instance belongs to
int

DataCost

[Hidden] [ReadOnly] [NotReplicated] [Deprecated]

The cost of saving the instance using data persistence.
string

Name

A non-unique identifier of the Instance
Instance

Parent

[NotReplicated]

Determines the hierarchical parent of the Instance
bool

RobloxLocked

[Hidden]

A deprecated property that used to protect CoreGui objects
bool

archivable

[Hidden] [NotReplicated] [Deprecated]
string

className

[ReadOnly] [NotReplicated] [Deprecated]

Functions

void

BindToRenderStep ( string name , int priority , Function function )

Given a string name of a function and a priority, this method binds the function to RunService/RenderStepped
bool

IsClient ( )

Returns whether the current environment is running on the client
bool

IsEdit ( )

Returns whether the current environment is in Edit mode
bool

IsRunMode ( )

Returns whether the ‘Run’ button has been pressed to run the simulation in Roblox Studio
bool

IsRunning ( )

Returns whether the game is currently running
bool

IsServer ( )

Returns whether the current environment is running on the server
bool

IsStudio ( )

Returns whether the current environment is running in Roblox Studio
void

Pause ( )

Pauses the game’s simulation if it is running, suspending physics and scripts
void

Reset ( )

[Deprecated]

Resets the current game to a waypoint set when RunService/Run was called
void

Run ( )

Runs the game’s simulation, running physics and scripts
void

Stop ( )

Ends the game’s simulation if it is running
void

UnbindFromRenderStep ( string name )

Unbinds a function that was bound to the render loop using RunService/BindToRenderStep

Inherited from Instance: Show Hide

void

ClearAllChildren ( )

This function destroys all of an Instance’s children.
Instance

Clone ( )

Create a copy of an object and all its descendants, ignoring objects that are not Instance/Archivable|Archivable
void

Destroy ( )

Sets the Instance/Parent property to nil, locks the Instance/Parent property, disconnects all connections and calls Destroy on all children.
Instance

FindFirstAncestor ( string name )

Returns the first ancestor of the Instance whose Instance/Name is equal to the given name.
Instance

FindFirstAncestorOfClass ( string className )

Returns the first ancestor of the Instance whose Instance/ClassName is equal to the given className.
Instance

FindFirstAncestorWhichIsA ( string className )

Returns the first ancestor of the Instance for whom Instance/IsA returns true for the given className.
Instance

FindFirstChild ( string name , bool recursive )

Returns the first child of the Instance found with the given name.
Instance

FindFirstChildOfClass ( string className )

Returns the first child of the Instance whose Instance/ClassName|ClassName is equal to the given className.
Instance

FindFirstChildWhichIsA ( string className , bool recursive )

Returns the first child of the Instance for whom Instance/IsA returns true for the given className.
Instance

FindFirstDescendant ( string name )

Actor

GetActor ( )

Variant

GetAttribute ( string attribute )

Returns the attribute which has been assigned to the given name
RBXScriptSignal

GetAttributeChangedSignal ( string attribute )

Returns an event that fires when the given attribute changes
Dictionary

GetAttributes ( )

Returns a dictionary of string → variant pairs for each of the Instance|Instance’s attributes
Objects

GetChildren ( )

Returns an array containing all of the Instance’s children.
string

GetDebugId ( int scopeLength )

[NotBrowsable]

Returns a coded string of the Instances DebugId used internally by Roblox.
Array

GetDescendants ( )

[CustomLuaState]

Returns an array containing all of the descendants of the instance
string

GetFullName ( )

Returns a string describing the Instance’s ancestry.
RBXScriptSignal

GetPropertyChangedSignal ( string property )

Get an event that fires when a given property of an object changes.
bool

IsA ( string className )

[CustomLuaState]

Returns true if an Instance’s class matches or inherits from a given class
bool

IsAncestorOf ( Instance descendant )

Returns true if an Instance is an ancestor of the given descendant.
bool

IsDescendantOf ( Instance ancestor )

Returns true if an Instance is a descendant of the given ancestor.
void

Remove ( )

[Deprecated]

Sets the object’s Parent to nil, and does the same for all its descendants.
void

SetAttribute ( string attribute , Variant value )

Sets the attribute with the given name to the given value
Instance

WaitForChild ( string childName , double timeOut )

[CustomLuaState] [CanYield]

Returns the child of the Instance with the given name. If the child does not exist, it will yield the current thread until it does.
Objects

children ( )

[Deprecated]

Returns an array of the object’s children.
Instance

clone ( )

[Deprecated]
void

destroy ( )

[Deprecated]
Instance

findFirstChild ( string name , bool recursive )

[Deprecated]
Objects

getChildren ( )

[Deprecated]
bool

isA ( string className )

[Deprecated] [CustomLuaState]
bool

isDescendantOf ( Instance ancestor )

[Deprecated]
void

remove ( )

[Deprecated]

Events

RBXScriptSignal

Heartbeat ( double deltaTime )

Fires every frame after the physics simulation has completed
RBXScriptSignal

PostSimulation ( double deltaTime )

RBXScriptSignal

PreAnimation ( double deltaTime )

RBXScriptSignal

PreRender ( double deltaTime )

RBXScriptSignal

PreSimulation ( double deltaTime )

RBXScriptSignal

RenderStepped ( double deltaTime )

Fires every frame prior to the frame being rendered
RBXScriptSignal

Stepped ( double time , double deltaTime )

Fires every frame prior to the physics simulation

Inherited from Instance: Show Hide

RBXScriptSignal

AncestryChanged ( Instance child , Instance parent )

Fires when the Instance/Parent property of the object or one of its ancestors is changed.
RBXScriptSignal

AttributeChanged ( string attribute )

Fires whenever an attribute is changed on the Instance
RBXScriptSignal

Changed ( string property )

Fired immediately after a property of an object changes.
RBXScriptSignal

ChildAdded ( Instance child )

Fires when an object is parented to this Instance.
RBXScriptSignal

ChildRemoved ( Instance child )

Fires when a child is removed from this Instance.
RBXScriptSignal

DescendantAdded ( Instance descendant )

Fires when a descendant is added to the Instance
RBXScriptSignal

DescendantRemoving ( Instance descendant )

Fires immediately before a descendant of the Instance is removed.
RBXScriptSignal

childAdded ( Instance child )

[Deprecated]

Code Samples

RunService Stepped

This code sample uses RunService’s Stepped event to create a Part that flies in a direction given a start position and speed. It uses a BodyPosition to move the Part, and calculates the new position of the Part each frame.

local RunService = game:GetService("RunService")

local PART_START_POS = Vector3.new(0, 10, 0)
local PART_SPEED = Vector3.new(10, 0, 0)

-- Create a Part with a BodyPosition
local part = Instance.new("Part")
part.CFrame = CFrame.new(PART_START_POS)
local bp = Instance.new("BodyPosition")
bp.Parent = part
bp.Position = PART_START_POS
part.Parent = workspace

local function onStep(currentTime, deltaTime)
	-- Move the part the distance it is meant to move
	-- in the last `deltaTime` seconds
	bp.Position = bp.Position + PART_SPEED * deltaTime
	
	-- Here's the math behind this:
	-- speed = displacement / time
	-- displacement = speed * time
end

RunService.Stepped:Connect(onStep)
ReplicatedFirst Script