How to script

A Script is a type of Lua code container that will run its contents on the server. By default, Scripts have print("Hello, world") as their contents. The instant that the following conditions are met, a Script’s Lua code is run in a new thread:

Disabled property is false
The Script object is a descendant of the Workspace or
ServerScriptService
The Script will continue to run until the above conditions are not met, it terminates or it raises an error (unless that error is raised by a function connected to some event that is firing). Additionally, the thread will be stopped if the Script or one of its ancestors is destroyed. A script will continue to run even if the Parent property is set to nil (and the Script is not destroyed).

It has access to server-side objects, properties and events. For example, Scripts can award badges to players using BadgeService, while a LocalScript on the client cannot. Actions taken by LocalScripts that are not replicated (due to Workspace.FilteringEnabled) will not be visible to Scripts.

Properties
ProtectedString
Source
The code to be executed

Inherited from BaseScript:
Hide
bool
Disabled
Determines whether a BaseScript will run or not.

Inherited from LuaSourceContainer:
Hide
Instance
CurrentEditor
 [notscriptable]
The Player who is currently editing this script. This property is only used when in Team Create mode.

Inherited from Instance:
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

string
Name
A non-unique identifier of the Instance

Instance
Parent
Determines the hierarchical parent of the Instance

bool
RobloxLocked
If true, the Instance and its descendants cannot be indexed or edited by a Script or LocalScript and will throw an error if it is attempted

Functions
string
GetHash ( )
Returns a hash of the script’s source

Inherited from Instance:
Hide
void
ClearAllChildren ( )
This function destroys all of an Instance's children.

Instance
Clone ( )
Create a deep copy of a Roblox instance and descendants where Archivable = true.

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 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.

Variant
GetAttribute ( string attribute )
RBXScriptSignal
GetAttributeChangedSignal ( string attribute )
Dictionary
GetAttributes ( )
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
SetAttribute ( string attribute , Variant 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.

Events
Inherited from Instance:
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 )
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.

Code Samples
Hello World
A Lua example of the classic hello world program. When run, it displays the simple message to the Output in Roblox Studio. By default, Script and LocalScript objects contain this code when they are first created.