var InOut = function (v, overshoot){ 
if (overshoot === undefined) { 
overshoot = 1.70158; 
} 
var s = overshoot * 1.525; 
if ((v *= 2) < 1) { 
return 0.5 * (v * v * ((s + 1) * v - s)); 
} 
 else { 
return 0.5 * ((v -= 2) * v * ((s + 1) * v + s) + 2); 
} 
} 
; 
module.exports = InOut;