function damp( x, y, lambda, dt ) {

	return lerp( x, y, 1 - Math.exp( - lambda * dt ) );

}
Smoothly interpolate a number from `x` to `y` in  a spring-like manner using a delta
time to maintain frame rate independent movement. For details, see
[Frame rate independent damping using lerp]{@link http://www.rorydriscoll.com/2016/03/07/frame-rate-independent-damping-using-lerp/}.

@param {number} x - The current point.
@param {number} y - The target point.
@param {number} lambda - A higher lambda value will make the movement more sudden,
and a lower value will make the movement more gradual.
@param {number} dt - Delta time in seconds.
@return {number} The interpolated value.