Custom tween quadratic easing equation for slowed end

Mr. Doob,
Knower and curator of all things 3D.

I need some assistance. Can you point me in the right direction for a custom quadratic easing equation for a dramatically slowed end animation? I probably still owe you a pint of your choice.

BTW, anybody else with more tweening custom easing equations experience, feel free to point me to a hello world on the topic.

Thanks all.


How things work under the hood in tween.js: tween.js/src/Easing.ts at 451041100e54c8cd2472872e307c1895f7ede7db · tweenjs/tween.js · GitHub