<cat>Dev.Lua</cat> nil is Lua's representation of empty data. Unset variables and non-existent table keys will be nil. This will be treated as false in if-statement contexts, but is not equal to false. Example: ``` print(nil) print(nil == 0) print(nil == 1) print(nil == nil) print(!nil) --because nil can be treated like a false boolean in some cases, "not nil" will equal true local myEmptyVariable --a variable with nothing in it (a 'nil' value) print(myEmptyVariable) local myTable = {a="foo", b="bar"} myTable["a"] = nil --setting a value in a table to nil effectively erases it from the table PrintTable(myTable) ``` Output:<br/>nil<br/>false<br/>false<br/>true<br/>true<br/>nil<br/>b = bar Output:<br/>nil<br/>false<br/>false<br/>true<br/>true<br/>nil<br/>b = bar⤶ ⤶ # Application in VGUI⤶ You can use nil to make some VGUI element transparent.⤶ ⤶ ## Example Code⤶ ⤶ ```⤶ local menu = vgui.Create( 'DFrame' )⤶ menu:SetSize( 300, 200 )⤶ menu:Center()⤶ menu:MakePopup()⤶ menu:SetTitle( 'Made by Freline' )⤶ ⤶ local panel = vgui.Create( 'DPanel', menu )⤶ panel:Dock( FILL )⤶ panel.Paint = nil⤶ ```⤶