How would I make an efficient typewriter effect?

[dthecoolest]

Yep, however for a more advanced version which takes into account lag and fps changes, the delta time version.

@Halalaluyafail3

When the time it takes to resume wait() changes, text will appear slower. Under normal circumstances this will work fine, but if the frame rate drops or there are too many threads to be resumed in one frame the wait() will take longer to resume, making the text appear slower.

Choosing to wait for a RunService event ( Heartbeat:Wait() , Stepped:Wait() , RenderStepped:Wait() ), will still make it susceptible to a drop in frame rate.

Example: Typewriter effect using DeltaTime

local RunService = game:GetService"RunService"
local Heartbeat = RunService.Heartbeat
local Goal = "Some text that should appear after some time."
local GoalLength = #Goal
local TimeToTake = GoalLength/30
local Accumulated = 0
while TimeToTake > Accumulated do
	Accumulated += Heartbeat:Wait()
	TextElement.Text = string.sub(Goal,1,math.floor((Accumulated/TimeToTake)*GoalLength))
end

With this, whenever the frequency of Heartbeat firing changes, the rate at which the text appears won’t change.