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Splines

Simple​

const spline = new CubicSpline.MultiPoint<number>({ compute: x => x })
    .addPoint(0, 0)
    .addPoint(1, 1)

const value = spline.compute(0.4)
Simple [0, 0] -> [1, 1]

Nested​

const spline = new CubicSpline.MultiPoint({ compute: x => x })
    .addPoint(0, 0)
    .addPoint(0.4, new CubicSpline.MultiPoint({ compute: x => 2 * x - x * x })
        .addPoint(0.2, -1)
        .addPoint(1, 1))

const value = spline.compute(0.4)
Nested with different mapper