Roblox TweenInfo
TweenInfo.new takes exactly 6 arguments in this order: duration, EasingStyle, EasingDirection, repeatCount, reverses and delayTime. It is the object TweenService uses to animate any property on a Roblox object, from position to transparency, and getting the order or type of any of those six arguments wrong makes the script fail without animating anything.
The order of the 6 arguments is fixed and unnamed; swapping reverses and delayTime around, for example, makes Luau try to read 0.2 as a boolean and true as a number, and the script breaks.
Create() alone animates nothing, it only builds the Tween object; without :Play() on the next line, the target property never changes value.
Values above 1 mid-curve are expected only in Back and Elastic; every other one of the 11 styles stays between 0 and 1 for the whole transition.
TweenInfo is the object that describes HOW an animation happens in TweenService: duration, easing style, direction, repeat count, whether it reverses and the initial delay. It doesn't say what to animate (that's the goal, a table of properties), only the rhythm. The full signature is TweenInfo.new(time, EasingStyle, EasingDirection, repeatCount, reverses, delayTime), and only time is required.
Always duration, EasingStyle, EasingDirection, repeatCount, reverses and delayTime, in that exact order; TweenInfo.new does not accept named arguments like a table constructor, so swapping the position of two values of the same type, like repeatCount and delayTime, throws no error but produces a completely different animation than expected.
In applies the chosen curve right at the start of the motion, so the animation begins slow and speeds up; Out mirrors the curve to the end, so it starts fast and slows down near the final value; InOut splits the curve at the midpoint, half In and half Out, producing a motion that eases at both ends.
repeatCount 2 means 2 extra cycles after the first one, 3 total cycles; reverses true adds a return phase to each of those cycles, so the animation plays forward-and-back three times in a row, 6 full phases, before stopping for good.
Because TweenService:Create() only builds the Tween object, it does not start the animation; without calling :Play() on the returned instance, the object sits ready but never fires, and since it is not a syntax error, the console shows nothing wrong.
TweenInfo.new(1, Enum.EasingStyle.Back, Enum.EasingDirection.Out, 0, false, 0)local TweenService = game:GetService("TweenService")
local info = TweenInfo.new(1, Enum.EasingStyle.Back, Enum.EasingDirection.Out, 0, false, 0)
local goal = { Position = UDim2.fromScale(0.5, 0.5) }
local tween = TweenService:Create(target, info, goal)
tween:Play()Everything is computed and animated locally in your browser; nothing is sent to any server.