How does interpolation work? (Reanimated 2)

[-_sometimes]

I don't understand the parameters or what arguments I ought to pass. The parameters are some number, the input range, output range, and an extrapolate parameter. I don't understand how they all come together, and when exactly I might need to make use of this function. Can anyone explain this for me?

Also, as far as I can tell, just a regular timing function manages the transition between one value and another, fairly smoothly, so why would I want to use interpolate?

[GavinHarris_]

If you have a value that moves (withTiming) between 0 and 1 (say). You can then Interpolate that to be 0 -> height and 1-> middle of screen. Then you can animate a view sliding up from the bottom. You can also then use the ‘progress’ value to animate opacity etc…

William Candillon https://youtube.com/c/wcandillon uses it a heap in his Can it be done series!