### Inverse of a Function

const expoIn = t =>

(t==0) ? 0 : Math.pow(2, 10 * (t - 1))

const expoInInverse= t =>

(t==0) ? 0 : ((Math.log(t) + 10 * Math.log(2)) / Math.log(2)) / 10

console.log(expoIn(.35) + ' ' + expoInInverse(expoIn(.35)))

Very nice inverse function calculator by user fawad over at Wolfram Alpha. Was attempting to invert a standard “exponential in” easing function – after some futzing I resorted to the calculator ðŸ˜€